<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet href="http://feeds.feedburner.com/~d/styles/rss2full.xsl" type="text/xsl" media="screen"?><?xml-stylesheet href="http://feeds.feedburner.com/~d/styles/itemcontent.css" type="text/css" media="screen"?><rss xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:admin="http://webns.net/mvcb/" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:slash="http://purl.org/rss/1.0/modules/slash/" xmlns:wfw="http://wellformedweb.org/CommentAPI/" xmlns:content="http://purl.org/rss/1.0/modules/content/" xmlns:creativeCommons="http://backend.userland.com/creativeCommonsRssModule" xmlns:feedburner="http://rssnamespace.org/feedburner/ext/1.0" version="2.0">
<channel>
    <title>c0t0d0s0.org - Technology</title>
    <link>http://www.c0t0d0s0.org/</link>
    <description>the sun in a lighthungry universe</description>
    <dc:language>en</dc:language>
    <generator>Serendipity 1.3 - http://www.s9y.org/</generator>
    
    

<atom10:link xmlns:atom10="http://www.w3.org/2005/Atom" rel="self" href="http://feeds.feedburner.com/C0t0d0s0org-Technology" type="application/rss+xml" /><item>
    <title>Nokia E71 - or: Small features ...</title>
    <link>http://feeds.feedburner.com/~r/C0t0d0s0org-Technology/~3/420957643/4926-Nokia-E71-or-Small-features-....html</link>
            <category>Technology</category>
    
    <comments>http://www.c0t0d0s0.org/archives/4926-Nokia-E71-or-Small-features-....html#comments</comments>
    <wfw:comment>http://www.c0t0d0s0.org/wfwcomment.php?cid=4926</wfw:comment>

    <slash:comments>3</slash:comments>
    <wfw:commentRss>http://www.c0t0d0s0.org/rss.php?version=2.0&amp;type=comments&amp;cid=4926</wfw:commentRss>
    

    <author>nospam@example.com (Joerg Moellenkamp)</author>
    <content:encoded><![CDATA[
    Yesterday i´ve got a new mobile. It´s one of this superduperallinclusive smartphone. There is even a GPS receiver in the device. Additionally the phone includes all this hip three to six letter acronym technologies. But the best feature of the mobile doesn´t need all this arcane technological wizardry.<br />
<br />
Before tell you about this feature, i have to describe one of my habits: I use my mobile as a alarm clock at home as the ringing of a telephone is more efficient than the ringing of a alarm clock as a high piority sleep interrupt. I assume ringing of the telephone is hardwired to "an important message" whereas the sound of an alarm clock is hardwired to "waking up and leaving the warm bed" in my brain. <br />
<br />
Okay ... the absolute best feature of the E71 is: When you press the middle of the cursor button of the locked mobile , it displays the time white on black (so it doesn´t dazzle you) with a font size you can even read with the small eyes at 05:00 o´clock when you have to reach the red-eye train ... 
    <img src="http://feeds.feedburner.com/~r/C0t0d0s0org-Technology/~4/420957643" height="1" width="1"/>]]></content:encoded>

    <pubDate>Tue, 14 Oct 2008 21:40:04 +0200</pubDate>
    <guid isPermaLink="false">http://www.c0t0d0s0.org/archives/4926-guid.html</guid>
    <category>e71</category>
<category>nokia</category>
<category>technology</category>
<creativeCommons:license>http://creativecommons.org/licenses/by-sa/2.5/</creativeCommons:license>
<feedburner:origLink>http://www.c0t0d0s0.org/archives/4926-Nokia-E71-or-Small-features-....html</feedburner:origLink></item>
<item>
    <title>Digging into Apache Hadoop</title>
    <link>http://feeds.feedburner.com/~r/C0t0d0s0org-Technology/~3/409132752/4888-Digging-into-Apache-Hadoop.html</link>
            <category>Technology</category>
    
    <comments>http://www.c0t0d0s0.org/archives/4888-Digging-into-Apache-Hadoop.html#comments</comments>
    <wfw:comment>http://www.c0t0d0s0.org/wfwcomment.php?cid=4888</wfw:comment>

    <slash:comments>5</slash:comments>
    <wfw:commentRss>http://www.c0t0d0s0.org/rss.php?version=2.0&amp;type=comments&amp;cid=4888</wfw:commentRss>
    

    <author>nospam@example.com (Joerg Moellenkamp)</author>
    <content:encoded><![CDATA[
    I´m exploring <a onclick="javascript: pageTracker._trackPageview('/extlink/hadoop.apache.org/');"  href="http://hadoop.apache.org/">Apache Hadoop</a> at the moment. This looks like a really interesting technology. What´s Hadoop? Hmm ... to explain it in a really simplified manner: It´s a distributed, highly available datastore. Okay ... yawn ...  no big deal so far. <br />
<br />
But there is an interesting twist in Hadoop. Let´s assume you have vast amounts of log files. A pile of data in the size of multiple Terabytes. You want to know the URLs of the Top-10 pages of your website.<br />
<br />
The standard old-school approach to this problem is: Starting an analyser on a big server which gathers all data via block or file based protocols to this analysing server. Of course this approach has several bottlenecks: The size of the network pipes, the amount of computing power in a single box, the amount of IOPS in a single server, the amount of IOPS of a single storage attached to the server, the amount of memory in a single server.<br />
<br />
But now think in HPC terms about this problem: You could divide this task in several ones. Let´s assume 64 MB shards. You  could compute the result for each of the shards on a seperate node. To stay in our example: This step print outs the pageviews of any URL in it´s shard. This fragments of the final result are collected and reduced to the final result: For example by adding the pageviews of a URL from every shard. By using the concepts you you seperate the task of analysing the log files on thousands of nodes in parallel. You get your answer in minutes, not hours or days. The advantage of doing so is to bring the data intensive parts  of computation to the data instead of bringing the data to the computation.<br />
<br />
Such algorithms are called <a onclick="javascript: pageTracker._trackPageview('/extlink/en.wikipedia.org/wiki/MapReduce');"  href="http://en.wikipedia.org/wiki/MapReduce">MapReduce</a>. This concept was introduced by Google and the core  competency of Google is to analyse big piles of data, thus such an mechanism is quite handy. I have several usecases in mind for such a solution: Commercial data warehousing, billing of large heaps of Call Data Records, mass converting jobs ... and so on ...<br />
<br />
What has all this stuff to do with <a onclick="javascript: pageTracker._trackPageview('/extlink/hadoop.apache.org/');"  href="http://hadoop.apache.org/">Hadoop</a>. Hadoop is an open-source implementation of this concepts. The Hadoop Wiki writes:<blockquote> Hadoop is a framework for running applications on large clusters built of commodity hardware. The Hadoop framework transparently provides applications both reliability and data motion. Hadoop implements a computational paradigm named  Map/Reduce, where the application is divided into many small fragments of work, each of which may be executed or reexecuted on any node in the cluster. In addition, it provides a distributed file system (HDFS) that stores data on the compute nodes, providing very high aggregate bandwidth across the cluster. Both Map/Reduce and the distributed file system are designed so that node failures are automatically handled by the framework.</blockquote>It does the housekeeping, the seperation of data in shards, the distribution of the analysing tasks on the server. You can view at it as an API/command line  controlled grid engine for data distribution and data processing.<br />
<br />
It consists out of the Hadoop Core, the <a onclick="javascript: pageTracker._trackPageview('/extlink/wiki.apache.org/hadoop/DFS');"  href="http://wiki.apache.org/hadoop/DFS">Hadoop Distributed File System</a> (it´s not a POSIXfilesystem integrated to the VFS, you can think of it like FTP, you need a client or you use an API to use it) , there is even an scripting language helping you to write the analysing jobs. This language is called <a onclick="javascript: pageTracker._trackPageview('/extlink/wiki.apache.org/pig/');"  href="http://wiki.apache.org/pig/">Pig</a>. Additional there is an effort to implement a database for structured data on top of Hadoop with <a onclick="javascript: pageTracker._trackPageview('/extlink/hadoop.apache.org/hbase/');"  href="http://hadoop.apache.org/hbase/">HBase</a>.<br />
<br />
At the moment there are some gotchas in this technology. Fore example you can´t work with compressed files in it, as gzip files shards aren´t  decompressible seperately (okay, it´s a problem of gzip, but it prevents you to work with it) (Update: I´m not entirely sure about this, it seems that you can work with block based compression like bz2, and gzip is indevelopment, at least according to the Pig documents). But here ZFS on-the-fly compression can be very helpful. I think i will create a Hadoop testbed with multiple zones on one of my systems this weekend.<br />
 
    <img src="http://feeds.feedburner.com/~r/C0t0d0s0org-Technology/~4/409132752" height="1" width="1"/>]]></content:encoded>

    <pubDate>Thu, 02 Oct 2008 11:07:05 +0200</pubDate>
    <guid isPermaLink="false">http://www.c0t0d0s0.org/archives/4888-guid.html</guid>
    <category>emerging technology</category>
<category>hadoop</category>
<category>technology</category>
<creativeCommons:license>http://creativecommons.org/licenses/by-sa/2.5/</creativeCommons:license>
<feedburner:origLink>http://www.c0t0d0s0.org/archives/4888-Digging-into-Apache-Hadoop.html</feedburner:origLink></item>
<item>
    <title>I found my next car</title>
    <link>http://feeds.feedburner.com/~r/C0t0d0s0org-Technology/~3/368803939/4730-I-found-my-next-car.html</link>
            <category>Technology</category>
    
    <comments>http://www.c0t0d0s0.org/archives/4730-I-found-my-next-car.html#comments</comments>
    <wfw:comment>http://www.c0t0d0s0.org/wfwcomment.php?cid=4730</wfw:comment>

    <slash:comments>6</slash:comments>
    <wfw:commentRss>http://www.c0t0d0s0.org/rss.php?version=2.0&amp;type=comments&amp;cid=4730</wfw:commentRss>
    

    <author>nospam@example.com (Joerg Moellenkamp)</author>
    <content:encoded><![CDATA[
    Next year in February i have to buy or lease a new car. I think, i just found my new car. A Volvo. To be exact: <a onclick="javascript: pageTracker._trackPageview('/extlink/www.volvocars.com/de/All-Cars-MY09/Volvo-XC60/Pages/default.aspx');"  href="http://www.volvocars.com/de/All-Cars-MY09/Volvo-XC60/Pages/default.aspx">The Volvo XC60.</a> Not because it´s a Volvo or because of the fact that it´s a really cool car. No, because of a little function integrated into the car. It´s called City Assist. The car has the capability to automatically brake the car in such situations like stop-and-go at a traffic light. As accidents in such situations hit me once or twice in the time i own a car, this would really reduce the costs for repairs and this feature would let my car insurance finally drop to a decent level. Sometimes technology is really a heaven-send... 
    <img src="http://feeds.feedburner.com/~r/C0t0d0s0org-Technology/~4/368803939" height="1" width="1"/>]]></content:encoded>

    <pubDate>Tue, 19 Aug 2008 07:57:06 +0200</pubDate>
    <guid isPermaLink="false">http://www.c0t0d0s0.org/archives/4730-guid.html</guid>
    <creativeCommons:license>http://creativecommons.org/licenses/by-sa/2.5/</creativeCommons:license>
<feedburner:origLink>http://www.c0t0d0s0.org/archives/4730-I-found-my-next-car.html</feedburner:origLink></item>
<item>
    <title>Nice tricks by merging photographs and video</title>
    <link>http://feeds.feedburner.com/~r/C0t0d0s0org-Technology/~3/367514257/4718-Nice-tricks-by-merging-photographs-and-video.html</link>
            <category>Technology</category>
    
    <comments>http://www.c0t0d0s0.org/archives/4718-Nice-tricks-by-merging-photographs-and-video.html#comments</comments>
    <wfw:comment>http://www.c0t0d0s0.org/wfwcomment.php?cid=4718</wfw:comment>

    <slash:comments>0</slash:comments>
    <wfw:commentRss>http://www.c0t0d0s0.org/rss.php?version=2.0&amp;type=comments&amp;cid=4718</wfw:commentRss>
    

    <author>nospam@example.com (Joerg Moellenkamp)</author>
    <content:encoded><![CDATA[
    I assume this demo reel of this project in computerized imaging shows the drain, where the next two or three bigger speed bumps and core multiplications will find their way into consumption. The projects website "<a onclick="javascript: pageTracker._trackPageview('/extlink/grail.cs.washington.edu/projects/videoenhancement/videoEnhancement.htm');"  href="http://grail.cs.washington.edu/projects/videoenhancement/videoEnhancement.htm">Using Photographs to Enhance Videos of a Static Scene</a>" describes:<br />
<blockquote>We present a framework for automatically enhancing videos of a static scene using a few photographs of the same scene. For example, our system can transfer photographic qualities such as high resolution, high dynamic range and better lighting from the photographs to the video.</blockquote>At least you should look at the <a onclick="javascript: pageTracker._trackPageview('/extlink/grail.cs.washington.edu/projects/videoenhancement/videoEnhancement.htm');"  href="http://grail.cs.washington.edu/projects/videoenhancement/videoEnhancement.htm">embedded video presenting the capabilities of this technology</a>. 
    <img src="http://feeds.feedburner.com/~r/C0t0d0s0org-Technology/~4/367514257" height="1" width="1"/>]]></content:encoded>

    <pubDate>Sun, 17 Aug 2008 22:35:36 +0200</pubDate>
    <guid isPermaLink="false">http://www.c0t0d0s0.org/archives/4718-guid.html</guid>
    <creativeCommons:license>http://creativecommons.org/licenses/by-sa/2.5/</creativeCommons:license>
<feedburner:origLink>http://www.c0t0d0s0.org/archives/4718-Nice-tricks-by-merging-photographs-and-video.html</feedburner:origLink></item>
<item>
    <title>The most southern SamFS installation</title>
    <link>http://feeds.feedburner.com/~r/C0t0d0s0org-Technology/~3/316441278/4481-The-most-southern-SamFS-installation.html</link>
            <category>Technology</category>
    
    <comments>http://www.c0t0d0s0.org/archives/4481-The-most-southern-SamFS-installation.html#comments</comments>
    <wfw:comment>http://www.c0t0d0s0.org/wfwcomment.php?cid=4481</wfw:comment>

    <slash:comments>1</slash:comments>
    <wfw:commentRss>http://www.c0t0d0s0.org/rss.php?version=2.0&amp;type=comments&amp;cid=4481</wfw:commentRss>
    

    <author>nospam@example.com (Joerg Moellenkamp)</author>
    <content:encoded><![CDATA[
    Nice presentation about the most southern installation of SamFS: <a onclick="javascript: pageTracker._trackPageview('/extlink/epic.awi.de/Publications/Pfe2005b.pdf');"  href="http://epic.awi.de/Publications/Pfe2005b.pdf">Ein Robot auf hoher See - SAM-FS bei 70 Grad Süd</a> (sorry, only in german language, but nice photos). It´s about a SamFS installation on the Polarstern, a german research vessel. I found this presentation held by Dr. Hans Pfeiffenberger from the Alfred Wegener Institute for Polar and Marine Research after a hint from a colleague. This is storage under extreme conditions. 
    <img src="http://feeds.feedburner.com/~r/C0t0d0s0org-Technology/~4/316441278" height="1" width="1"/>]]></content:encoded>

    <pubDate>Wed, 04 Jun 2008 12:31:12 +0200</pubDate>
    <guid isPermaLink="false">http://www.c0t0d0s0.org/archives/4481-guid.html</guid>
    <category>samfs</category>
<category>technology</category>
<creativeCommons:license>http://creativecommons.org/licenses/by-sa/2.5/</creativeCommons:license>
<feedburner:origLink>http://www.c0t0d0s0.org/archives/4481-The-most-southern-SamFS-installation.html</feedburner:origLink></item>
<item>
    <title>Load Average</title>
    <link>http://feeds.feedburner.com/~r/C0t0d0s0org-Technology/~3/316441279/4399-Load-Average.html</link>
            <category>Technology</category>
    
    <comments>http://www.c0t0d0s0.org/archives/4399-Load-Average.html#comments</comments>
    <wfw:comment>http://www.c0t0d0s0.org/wfwcomment.php?cid=4399</wfw:comment>

    <slash:comments>0</slash:comments>
    <wfw:commentRss>http://www.c0t0d0s0.org/rss.php?version=2.0&amp;type=comments&amp;cid=4399</wfw:commentRss>
    

    <author>nospam@example.com (Joerg Moellenkamp)</author>
    <content:encoded><![CDATA[
    It´s a common practice between us admins to look after the load averages. Interestingly the correct math behind this numbers is not really simple. Roman wrote about it at <a onclick="javascript: pageTracker._trackPageview('/extlink/blogs.sun.com/rvs/entry/how_many_kernel_engineers_does');"  href="http://blogs.sun.com/rvs/entry/how_many_kernel_engineers_does">How many kernel engineers does it take to solve one differential equation?</a>. Interesting read. 
    <img src="http://feeds.feedburner.com/~r/C0t0d0s0org-Technology/~4/316441279" height="1" width="1"/>]]></content:encoded>

    <pubDate>Mon, 12 May 2008 08:37:03 +0200</pubDate>
    <guid isPermaLink="false">http://www.c0t0d0s0.org/archives/4399-guid.html</guid>
    <creativeCommons:license>http://creativecommons.org/licenses/by-sa/2.5/</creativeCommons:license>
<feedburner:origLink>http://www.c0t0d0s0.org/archives/4399-Load-Average.html</feedburner:origLink></item>
<item>
    <title>Thirteen years ...</title>
    <link>http://feeds.feedburner.com/~r/C0t0d0s0org-Technology/~3/316441280/3949-Thirteen-years-....html</link>
            <category>Technology</category>
    
    <comments>http://www.c0t0d0s0.org/archives/3949-Thirteen-years-....html#comments</comments>
    <wfw:comment>http://www.c0t0d0s0.org/wfwcomment.php?cid=3949</wfw:comment>

    <slash:comments>0</slash:comments>
    <wfw:commentRss>http://www.c0t0d0s0.org/rss.php?version=2.0&amp;type=comments&amp;cid=3949</wfw:commentRss>
    

    <author>nospam@example.com (Joerg Moellenkamp)</author>
    <content:encoded><![CDATA[
    When somebody told me in 1995 that i will hear music on a mobile telephon, which updates my <a onclick="javascript: pageTracker._trackPageview('/extlink/www.lastfm.de/user/c0t0d0s0/');"  href="http://www.lastfm.de/user/c0t0d0s0/">play list</a> on a website while walking around in my room via wireless lan while reading mail  ... in thirteen years from that day, i would had told him or her to take less of the pills he or she took . Well ... today i´ve installed <a onclick="javascript: pageTracker._trackPageview('/extlink/dev.c99.org/MobileScrobbler/');"  href="http://dev.c99.org/MobileScrobbler/">MobileScrobbler</a> on my iPhone and this now my mobile does exactly the stuff described in the beginning. How time flies.  
    <img src="http://feeds.feedburner.com/~r/C0t0d0s0org-Technology/~4/316441280" height="1" width="1"/>]]></content:encoded>

    <pubDate>Sat, 05 Jan 2008 19:49:23 +0100</pubDate>
    <guid isPermaLink="false">http://www.c0t0d0s0.org/archives/3949-guid.html</guid>
    <creativeCommons:license>http://creativecommons.org/licenses/by-sa/2.5/</creativeCommons:license>
<feedburner:origLink>http://www.c0t0d0s0.org/archives/3949-Thirteen-years-....html</feedburner:origLink></item>
<item>
    <title>Jatho</title>
    <link>http://feeds.feedburner.com/~r/C0t0d0s0org-Technology/~3/316441281/3945-Jatho.html</link>
            <category>Technology</category>
    
    <comments>http://www.c0t0d0s0.org/archives/3945-Jatho.html#comments</comments>
    <wfw:comment>http://www.c0t0d0s0.org/wfwcomment.php?cid=3945</wfw:comment>

    <slash:comments>0</slash:comments>
    <wfw:commentRss>http://www.c0t0d0s0.org/rss.php?version=2.0&amp;type=comments&amp;cid=3945</wfw:commentRss>
    

    <author>nospam@example.com (Joerg Moellenkamp)</author>
    <content:encoded><![CDATA[
    Looking TV educates. This morning i viewed a documentation i´ve recorded a few days ago on the german TV channel Phoenix. It was a documentation about a reconstruction of the motorglider of Karl Jatho. I didn´t know that <a onclick="javascript: pageTracker._trackPageview('/extlink/en.wikipedia.org/wiki/Karl_Jatho');"  href="http://en.wikipedia.org/wiki/Karl_Jatho">Jatho</a> made his first motorized flight a few months before the Wright Brothers. 
    <img src="http://feeds.feedburner.com/~r/C0t0d0s0org-Technology/~4/316441281" height="1" width="1"/>]]></content:encoded>

    <pubDate>Sat, 05 Jan 2008 10:12:55 +0100</pubDate>
    <guid isPermaLink="false">http://www.c0t0d0s0.org/archives/3945-guid.html</guid>
    <creativeCommons:license>http://creativecommons.org/licenses/by-sa/2.5/</creativeCommons:license>
<feedburner:origLink>http://www.c0t0d0s0.org/archives/3945-Jatho.html</feedburner:origLink></item>
<item>
    <title>Thumper@Home</title>
    <link>http://feeds.feedburner.com/~r/C0t0d0s0org-Technology/~3/316441282/3669-ThumperHome.html</link>
            <category>Technology</category>
    
    <comments>http://www.c0t0d0s0.org/archives/3669-ThumperHome.html#comments</comments>
    <wfw:comment>http://www.c0t0d0s0.org/wfwcomment.php?cid=3669</wfw:comment>

    <slash:comments>4</slash:comments>
    <wfw:commentRss>http://www.c0t0d0s0.org/rss.php?version=2.0&amp;type=comments&amp;cid=3669</wfw:commentRss>
    

    <author>nospam@example.com (Joerg Moellenkamp)</author>
    <content:encoded><![CDATA[
    <a onclick="javascript: pageTracker._trackPageview('/extlink/zpool.org/2007/10/31/ultimate-home-zfs-storage-server');"  href="http://zpool.org/2007/10/31/ultimate-home-zfs-storage-server">zpool.org</a> found a really interesting computer case for a Thumper@home: <a onclick="javascript: pageTracker._trackPageview('/extlink/usa.chenbro.com/corporatesite/products_detail.php?serno=97');"  href="http://usa.chenbro.com/corporatesite/products_detail.php?serno=97">Chenbro ES34069</a>. This case is a small ITX case with four hot swapable drive bays and room for a single boot disk (would populate with a flash based solid state disk) 
    <img src="http://feeds.feedburner.com/~r/C0t0d0s0org-Technology/~4/316441282" height="1" width="1"/>]]></content:encoded>

    <pubDate>Wed, 31 Oct 2007 09:11:04 +0100</pubDate>
    <guid isPermaLink="false">http://www.c0t0d0s0.org/archives/3669-guid.html</guid>
    <creativeCommons:license>http://creativecommons.org/licenses/by-sa/2.5/</creativeCommons:license>
<feedburner:origLink>http://www.c0t0d0s0.org/archives/3669-ThumperHome.html</feedburner:origLink></item>
<item>
    <title>Skynet 9 - Humans 0</title>
    <link>http://feeds.feedburner.com/~r/C0t0d0s0org-Technology/~3/316441283/3636-Skynet-9-Humans-0.html</link>
            <category>Technology</category>
    
    <comments>http://www.c0t0d0s0.org/archives/3636-Skynet-9-Humans-0.html#comments</comments>
    <wfw:comment>http://www.c0t0d0s0.org/wfwcomment.php?cid=3636</wfw:comment>

    <slash:comments>0</slash:comments>
    <wfw:commentRss>http://www.c0t0d0s0.org/rss.php?version=2.0&amp;type=comments&amp;cid=3636</wfw:commentRss>
    

    <author>nospam@example.com (Joerg Moellenkamp)</author>
    <content:encoded><![CDATA[
    A fully automatic Triple-A goes berzerk and <a onclick="javascript: pageTracker._trackPageview('/extlink/gizmodo.com/gadgets/weapons/robot-cannon-goes-berserk-kills-9-312443.php');"  href="http://gizmodo.com/gadgets/weapons/robot-cannon-goes-berserk-kills-9-312443.php">kills 9 soldier in south africa</a>. <br />
<blockquote>A robot cannon began wildly and autonomously firing its huge gun in South Africa last Friday, killing 9 soldiers and wounding 14. The Oerlikon GDF-005 antiaircraft gun suddenly began uncontrollably shooting as it swung back and forth, spraying hundreds of high-explosive 35mm cannon shells all over the place</blockquote><br />
This is a good example why software should never ever control the actual firing of bullets. In wartimes it may be a good tradeoff to design a trigger-happy robot for antimortar/antishell artillery, as it´s propable that more people are killed by mortar rounds then by a berzerk robot. But at peace time without incoming rounds? At least it wasn´t a wise choise to put live ammunition into this robot. 
    <img src="http://feeds.feedburner.com/~r/C0t0d0s0org-Technology/~4/316441283" height="1" width="1"/>]]></content:encoded>

    <pubDate>Tue, 23 Oct 2007 09:47:13 +0200</pubDate>
    <guid isPermaLink="false">http://www.c0t0d0s0.org/archives/3636-guid.html</guid>
    <category>technology</category>
<creativeCommons:license>http://creativecommons.org/licenses/by-sa/2.5/</creativeCommons:license>
<feedburner:origLink>http://www.c0t0d0s0.org/archives/3636-Skynet-9-Humans-0.html</feedburner:origLink></item>
<item>
    <title>A380 - photos of the maiden flight of the MSN11</title>
    <link>http://feeds.feedburner.com/~r/C0t0d0s0org-Technology/~3/316441284/3483-A380-photos-of-the-maiden-flight-of-the-MSN11.html</link>
            <category>Technology</category>
    
    <comments>http://www.c0t0d0s0.org/archives/3483-A380-photos-of-the-maiden-flight-of-the-MSN11.html#comments</comments>
    <wfw:comment>http://www.c0t0d0s0.org/wfwcomment.php?cid=3483</wfw:comment>

    <slash:comments>0</slash:comments>
    <wfw:commentRss>http://www.c0t0d0s0.org/rss.php?version=2.0&amp;type=comments&amp;cid=3483</wfw:commentRss>
    

    <author>nospam@example.com (Joerg Moellenkamp)</author>
    <content:encoded><![CDATA[
    I´ve got some really good photos of the maiden flight of the A380 MSN11. You will find them at <a onclick="javascript: pageTracker._trackPageview('/extlink/aviation.c0t0d0s0.org');"  href="http://aviation.c0t0d0s0.org">aviation.c0t0d0s0.org</a>.(<a onclick="javascript: pageTracker._trackPageview('/extlink/aviation.c0t0d0s0.org/index.php?/archives/7-A380-Mehr-Bilder-vom-Erstflug-der-MSN011.html');"  href="http://aviation.c0t0d0s0.org/index.php?/archives/7-A380-Mehr-Bilder-vom-Erstflug-der-MSN011.html">here</a> and <a onclick="javascript: pageTracker._trackPageview('/extlink/aviation.c0t0d0s0.org/index.php?/archives/6-A380-Photo-vom-Erstflug-der-MSN11.html');"  href="http://aviation.c0t0d0s0.org/index.php?/archives/6-A380-Photo-vom-Erstflug-der-MSN11.html">here</a> 
    <img src="http://feeds.feedburner.com/~r/C0t0d0s0org-Technology/~4/316441284" height="1" width="1"/>]]></content:encoded>

    <pubDate>Wed, 05 Sep 2007 15:03:14 +0200</pubDate>
    <guid isPermaLink="false">http://www.c0t0d0s0.org/archives/3483-guid.html</guid>
    <category>Technology</category>
<creativeCommons:license>http://creativecommons.org/licenses/by-sa/2.5/</creativeCommons:license>
<feedburner:origLink>http://www.c0t0d0s0.org/archives/3483-A380-photos-of-the-maiden-flight-of-the-MSN11.html</feedburner:origLink></item>
<item>
    <title>Ausparkhilfen beim A380?</title>
    <link>http://feeds.feedburner.com/~r/C0t0d0s0org-Technology/~3/316441285/3468-Ausparkhilfen-beim-A380.html</link>
            <category>Technology</category>
    
    <comments>http://www.c0t0d0s0.org/archives/3468-Ausparkhilfen-beim-A380.html#comments</comments>
    <wfw:comment>http://www.c0t0d0s0.org/wfwcomment.php?cid=3468</wfw:comment>

    <slash:comments>0</slash:comments>
    <wfw:commentRss>http://www.c0t0d0s0.org/rss.php?version=2.0&amp;type=comments&amp;cid=3468</wfw:commentRss>
    

    <author>nospam@example.com (Joerg Moellenkamp)</author>
    <content:encoded><![CDATA[
    Ob Airbus jetzt wohl Ausparksensoren beim A380 nachruestet? <a onclick="javascript: pageTracker._trackPageview('/extlink/www.aero.de/news.php?varnewsid=4553');"  href="http://www.aero.de/news.php?varnewsid=4553">Airbus A380 in Bangkok leicht beschädigt</a> 
    <img src="http://feeds.feedburner.com/~r/C0t0d0s0org-Technology/~4/316441285" height="1" width="1"/>]]></content:encoded>

    <pubDate>Sun, 02 Sep 2007 09:15:44 +0200</pubDate>
    <guid isPermaLink="false">http://www.c0t0d0s0.org/archives/3468-guid.html</guid>
    <category>Technology</category>
<creativeCommons:license>http://creativecommons.org/licenses/by-sa/2.5/</creativeCommons:license>
<feedburner:origLink>http://www.c0t0d0s0.org/archives/3468-Ausparkhilfen-beim-A380.html</feedburner:origLink></item>
<item>
    <title>787 further delayed?</title>
    <link>http://feeds.feedburner.com/~r/C0t0d0s0org-Technology/~3/316441286/3467-787-further-delayed.html</link>
            <category>Technology</category>
    
    <comments>http://www.c0t0d0s0.org/archives/3467-787-further-delayed.html#comments</comments>
    <wfw:comment>http://www.c0t0d0s0.org/wfwcomment.php?cid=3467</wfw:comment>

    <slash:comments>2</slash:comments>
    <wfw:commentRss>http://www.c0t0d0s0.org/rss.php?version=2.0&amp;type=comments&amp;cid=3467</wfw:commentRss>
    

    <author>nospam@example.com (Joerg Moellenkamp)</author>
    <content:encoded><![CDATA[
    Sometimes it looks like Boeing is the IBM of the aircraft industry: Bold statements galore, but nothing behind it <img src="http://www.c0t0d0s0.org/templates/default/img/emoticons/wink.png" alt=";-)" style="display: inline; vertical-align: bottom;" class="emoticon" />. Interesting article at the Seattle Times : <a onclick="javascript: pageTracker._trackPageview('/extlink/archives.seattletimes.nwsource.com/cgi-bin/texis.cgi/web/vortex/display?slug=boeing01&amp;amp;date=20070901&amp;amp;query=787');"  href="http://archives.seattletimes.nwsource.com/cgi-bin/texis.cgi/web/vortex/display?slug=boeing01&amp;date=20070901&amp;query=787">Boeing may acknowledge further 787 delays next week</a>. I remember dozens of articles in the media who try to tell the world, that Boeing is so much better at constructing the 787 then Airbus at building the A380. But:  The airframe of the 787 at rollout wasn´t able to fly, even when all other systems were in place and functional, because of temporary fasteners.<blockquote>Boeing partly dismantled the first 787 immediately after its rollout to allow mechanics to install systems  including electrical wiring, hydraulic tubes and the flight-deck instrumentation  and also to replace temporary fasteners.</blockquote>And according to other reports,  switching on the power in the plane is still weeks away. I simply do not believe that they deliver their first 787 in  May 2008. I would bet on May 2009. At the end, it´s like with the Power6 4.7 Ghz <img src="http://www.c0t0d0s0.org/templates/default/img/emoticons/wink.png" alt=";-)" style="display: inline; vertical-align: bottom;" class="emoticon" /> 
    <img src="http://feeds.feedburner.com/~r/C0t0d0s0org-Technology/~4/316441286" height="1" width="1"/>]]></content:encoded>

    <pubDate>Sat, 01 Sep 2007 12:11:38 +0200</pubDate>
    <guid isPermaLink="false">http://www.c0t0d0s0.org/archives/3467-guid.html</guid>
    <category>Technology</category>
<creativeCommons:license>http://creativecommons.org/licenses/by-sa/2.5/</creativeCommons:license>
<feedburner:origLink>http://www.c0t0d0s0.org/archives/3467-787-further-delayed.html</feedburner:origLink></item>
<item>
    <title>Everything else is just a toy ...</title>
    <link>http://feeds.feedburner.com/~r/C0t0d0s0org-Technology/~3/316441287/3443-Everything-else-is-just-a-toy-....html</link>
            <category>Technology</category>
    
    <comments>http://www.c0t0d0s0.org/archives/3443-Everything-else-is-just-a-toy-....html#comments</comments>
    <wfw:comment>http://www.c0t0d0s0.org/wfwcomment.php?cid=3443</wfw:comment>

    <slash:comments>0</slash:comments>
    <wfw:commentRss>http://www.c0t0d0s0.org/rss.php?version=2.0&amp;type=comments&amp;cid=3443</wfw:commentRss>
    

    <author>nospam@example.com (Joerg Moellenkamp)</author>
    <content:encoded><![CDATA[
    <center><a onclick="javascript: pageTracker._trackPageview('/extlink/maps.google.com/maps?p=&amp;amp;c=&amp;amp;t=k&amp;amp;hl=en&amp;amp;ll=43.613697,1.36345&amp;amp;z=19');"  class='serendipity_image_link' href='http://maps.google.com/maps?p=&amp;c=&amp;t=k&amp;hl=en&amp;ll=43.613697,1.36345&amp;z=19' target="_blank"><!-- s9ymdb:312 --><img width="400" height="244" style="border: 0px; padding-left: 5px; padding-right: 5px;" src="http://www.c0t0d0s0.org/uploads/a380_tls.serendipityThumb.jpg" alt=""  /></a></a></center><br />
A second A380 can be found <a onclick="javascript: pageTracker._trackPageview('/extlink/maps.google.com/maps?t=k&amp;amp;hl=en&amp;amp;ie=UTF8&amp;amp;ll=43.616411,1.364338&amp;amp;spn=0.001837,0.004973&amp;amp;z=18&amp;amp;om=1');"  href="http://maps.google.com/maps?t=k&amp;hl=en&amp;ie=UTF8&amp;ll=43.616411,1.364338&amp;spn=0.001837,0.004973&amp;z=18&amp;om=1">here</a>, even a A340 looks a little bit small in relation to the lady.<br />
<small>(found on <a onclick="javascript: pageTracker._trackPageview('/extlink/maps.google.com/maps?p=&amp;amp;c=&amp;amp;t=k&amp;amp;hl=en&amp;amp;ll=43.613697,1.36345&amp;amp;z=19');"  href="http://maps.google.com/maps?p=&amp;c=&amp;t=k&amp;hl=en&amp;ll=43.613697,1.36345&amp;z=19">Google Maps</a> via <a onclick="javascript: pageTracker._trackPageview('/extlink/googlesightseeing.com/maps?p=1507&amp;amp;c=&amp;amp;t=k&amp;amp;hl=en&amp;amp;ll=43.613724,1.363699&amp;amp;z=19');"  href="http://googlesightseeing.com/maps?p=1507&amp;c=&amp;t=k&amp;hl=en&amp;ll=43.613724,1.363699&amp;z=19">Google Sightseeing</a>)</small> 
    <img src="http://feeds.feedburner.com/~r/C0t0d0s0org-Technology/~4/316441287" height="1" width="1"/>]]></content:encoded>

    <pubDate>Thu, 23 Aug 2007 09:20:44 +0200</pubDate>
    <guid isPermaLink="false">http://www.c0t0d0s0.org/archives/3443-guid.html</guid>
    <category>Technology</category>
<creativeCommons:license>http://creativecommons.org/licenses/by-sa/2.5/</creativeCommons:license>
<feedburner:origLink>http://www.c0t0d0s0.org/archives/3443-Everything-else-is-just-a-toy-....html</feedburner:origLink></item>
<item>
    <title>A380-Auslieferung</title>
    <link>http://feeds.feedburner.com/~r/C0t0d0s0org-Technology/~3/316441288/3424-A380-Auslieferung.html</link>
            <category>Technology</category>
    
    <comments>http://www.c0t0d0s0.org/archives/3424-A380-Auslieferung.html#comments</comments>
    <wfw:comment>http://www.c0t0d0s0.org/wfwcomment.php?cid=3424</wfw:comment>

    <slash:comments>0</slash:comments>
    <wfw:commentRss>http://www.c0t0d0s0.org/rss.php?version=2.0&amp;type=comments&amp;cid=3424</wfw:commentRss>
    

    <author>nospam@example.com (Joerg Moellenkamp)</author>
    <content:encoded><![CDATA[
    Erstauslieferung der SIA-A380 ist am <a onclick="javascript: pageTracker._trackPageview('/extlink/www.ad-hoc-news.de/Marktberichte/de/12907170/DJ-Airbus-liefert-am-15-Oktober-erste-A380-an-Singapore');"  href="http://www.ad-hoc-news.de/Marktberichte/de/12907170/DJ-Airbus-liefert-am-15-Oktober-erste-A380-an-Singapore">15. Oktober</a>. Vielleicht hören dann endlich mal die Unkenrufe auf ... 
    <img src="http://feeds.feedburner.com/~r/C0t0d0s0org-Technology/~4/316441288" height="1" width="1"/>]]></content:encoded>

    <pubDate>Thu, 16 Aug 2007 09:57:33 +0200</pubDate>
    <guid isPermaLink="false">http://www.c0t0d0s0.org/archives/3424-guid.html</guid>
    <category>Technology</category>
<creativeCommons:license>http://creativecommons.org/licenses/by-sa/2.5/</creativeCommons:license>
<feedburner:origLink>http://www.c0t0d0s0.org/archives/3424-A380-Auslieferung.html</feedburner:origLink></item>
<item>
    <title>A380 Seitenwindtests</title>
    <link>http://feeds.feedburner.com/~r/C0t0d0s0org-Technology/~3/316441289/3409-A380-Seitenwindtests.html</link>
            <category>Technology</category>
    
    <comments>http://www.c0t0d0s0.org/archives/3409-A380-Seitenwindtests.html#comments</comments>
    <wfw:comment>http://www.c0t0d0s0.org/wfwcomment.php?cid=3409</wfw:comment>

    <slash:comments>0</slash:comments>
    <wfw:commentRss>http://www.c0t0d0s0.org/rss.php?version=2.0&amp;type=comments&amp;cid=3409</wfw:commentRss>
    

    <author>nospam@example.com (Joerg Moellenkamp)</author>
    <content:encoded><![CDATA[
    <center><a onclick="javascript: pageTracker._trackPageview('/extlink/www.youtube.com/watch?v=CSKJnbQe6Bk');"  class='serendipity_image_link' href='http://www.youtube.com/watch?v=CSKJnbQe6Bk' target="_blank"><!-- s9ymdb:306 --><img width="400" height="321" style="border: 0px; padding-left: 5px; padding-right: 5px;" src="http://www.c0t0d0s0.org/uploads/a380seitenwind.serendipityThumb.jpg" alt=""  /></a></center><br />
Two impressive points at this video: The landing with cross winds and the the sheer size of the lady ... 
    <img src="http://feeds.feedburner.com/~r/C0t0d0s0org-Technology/~4/316441289" height="1" width="1"/>]]></content:encoded>

    <pubDate>Sun, 12 Aug 2007 09:07:17 +0200</pubDate>
    <guid isPermaLink="false">http://www.c0t0d0s0.org/archives/3409-guid.html</guid>
    <category>a380</category>
<category>Technology</category>
<creativeCommons:license>http://creativecommons.org/licenses/by-sa/2.5/</creativeCommons:license>
<feedburner:origLink>http://www.c0t0d0s0.org/archives/3409-A380-Seitenwindtests.html</feedburner:origLink></item>
<item>
    <title>787 delayed? </title>
    <link>http://feeds.feedburner.com/~r/C0t0d0s0org-Technology/~3/316441290/3408-787-delayed.html</link>
            <category>Technology</category>
    
    <comments>http://www.c0t0d0s0.org/archives/3408-787-delayed.html#comments</comments>
    <wfw:comment>http://www.c0t0d0s0.org/wfwcomment.php?cid=3408</wfw:comment>

    <slash:comments>0</slash:comments>
    <wfw:commentRss>http://www.c0t0d0s0.org/rss.php?version=2.0&amp;type=comments&amp;cid=3408</wfw:commentRss>
    

    <author>nospam@example.com (Joerg Moellenkamp)</author>
    <content:encoded><![CDATA[
    The Chicago Tribune speculates in "<a onclick="javascript: pageTracker._trackPageview('/extlink/www.chicagotribune.com/business/chi-sat_boeingaug11,0,3299870.story');"  href="http://www.chicagotribune.com/business/chi-sat_boeingaug11,0,3299870.story">Takeoff appears delayed for 787</a>" about delays due software problems. I don´t think, that the software will be the biggest problem of the 787. As far as i know, nobody has long-term experience with an large sized commercial aircraft consisting out of plastic. Until now all "plastic aircraft" were military ones, pulled into the hangar at night, relativly small time airborne and with a "no-matter-the-costs"-maintainance. But whats with an apron-parking aircraft, that rushes from one airport to another? 
    <img src="http://feeds.feedburner.com/~r/C0t0d0s0org-Technology/~4/316441290" height="1" width="1"/>]]></content:encoded>

    <pubDate>Sun, 12 Aug 2007 08:48:30 +0200</pubDate>
    <guid isPermaLink="false">http://www.c0t0d0s0.org/archives/3408-guid.html</guid>
    <category>787</category>
<category>Technology</category>
<creativeCommons:license>http://creativecommons.org/licenses/by-sa/2.5/</creativeCommons:license>
<feedburner:origLink>http://www.c0t0d0s0.org/archives/3408-787-delayed.html</feedburner:origLink></item>
<item>
    <title>FlashSSD for separated ZIL</title>
    <link>http://feeds.feedburner.com/~r/C0t0d0s0org-Technology/~3/316441291/3339-FlashSSD-for-separated-ZIL.html</link>
            <category>Technology</category>
    
    <comments>http://www.c0t0d0s0.org/archives/3339-FlashSSD-for-separated-ZIL.html#comments</comments>
    <wfw:comment>http://www.c0t0d0s0.org/wfwcomment.php?cid=3339</wfw:comment>

    <slash:comments>8</slash:comments>
    <wfw:commentRss>http://www.c0t0d0s0.org/rss.php?version=2.0&amp;type=comments&amp;cid=3339</wfw:commentRss>
    

    <author>nospam@example.com (Joerg Moellenkamp)</author>
    <content:encoded><![CDATA[
    I´ve <a href="http://www.c0t0d0s0.org/archives/3330-Separate-Logging-for-ZFS.html">reported</a> about <a onclick="javascript: pageTracker._trackPageview('/extlink/blogs.sun.com/perrin/entry/slog_blog_or_blogging_on');"  href="http://blogs.sun.com/perrin/entry/slog_blog_or_blogging_on">the separated ZIL</a> a few days ago. The problem of the described NVRAM PCI card is, that you can´t do a clusterfailover with such a device. How do you want to failover the seperate log,  when the log is on a card in the failed server? Sun had a product called Prestoserve, that was used to accelerate NFS and DB. It was static RAM with a battery. It was great for benchmarks, but suffered by the cluster problem.<br />
<br />
Thus you should use some external device, that can failover with the rest of your storage. The obvious choice would be a RAM-based Solid State Disk(SSD). But these are quite expensive: You need the RAM, you need a harddisk to keep the data persistent when power fails, and you need a rechargeable battery or an capacitor that´s able to power the SSD until all data is written to the hard disk.<br />
<br />
A Flash-Based SSD would be a more sensible choice, as Flash is a non-volatile memory by nature. Such a disk costs you approximatly 400$. But most people think "Oh no, wear will destroy it within a few days". Experiences with el-cheapo CF-cards underline this assumption. <br />
<br />
But let´s calculate with the specifications of a leading brand flash disk. Let´s assume: A 32 GB flash-based SSD is specified for 2.000.000 write cycles. We have a sustained stream of 40 MB per second (conservative assumption).  The wear leveling is perfect (perhaps supported by a seperate ZIL algorithm, that looks at the flash SSD as a cyclic buffer). Okay, a little math:<br />
<br />
<center><!-- s9ymdb:303 --><img width="400" height="77" style="border: 0px; padding-left: 5px; padding-right: 5px;" src="http://www.c0t0d0s0.org/uploads/wear_corrected.serendipityThumb.jpg" alt=""  /></center><br />
So this flash SSD wouldn´t fail by wear within the usable live of the storage and the server, even when you write 40 MB every second to it. I´m sure, that a flash disk doesn´t run such a long time, but this is not a wear problem, it´s the problem, that modern electronic hasn´t the build quality of former times. <br />
<br />
Based on this considerations, a flash SSD would be an interesting choice for the separated ZIL. Or at least: Wear isn´t a reason for not using Flash SSD<br />
<br />
PS: There is one point, i´m not perfectly sure, but i interpret the 2 million write cycles as the ability to erase and write the full disk 2 million times. 
    <img src="http://feeds.feedburner.com/~r/C0t0d0s0org-Technology/~4/316441291" height="1" width="1"/>]]></content:encoded>

    <pubDate>Thu, 26 Jul 2007 06:23:48 +0200</pubDate>
    <guid isPermaLink="false">http://www.c0t0d0s0.org/archives/3339-guid.html</guid>
    <category>flash</category>
<category>opensolaris</category>
<category>solaris</category>
<category>sun</category>
<category>Technology</category>
<category>zfs</category>
<creativeCommons:license>http://creativecommons.org/licenses/by-sa/2.5/</creativeCommons:license>
<feedburner:origLink>http://www.c0t0d0s0.org/archives/3339-FlashSSD-for-separated-ZIL.html</feedburner:origLink></item>
<item>
    <title>Greg Papadopoulos abot software patents</title>
    <link>http://feeds.feedburner.com/~r/C0t0d0s0org-Technology/~3/316441292/3135-Greg-Papadopoulos-abot-software-patents.html</link>
            <category>Technology</category>
    
    <comments>http://www.c0t0d0s0.org/archives/3135-Greg-Papadopoulos-abot-software-patents.html#comments</comments>
    <wfw:comment>http://www.c0t0d0s0.org/wfwcomment.php?cid=3135</wfw:comment>

    <slash:comments>1</slash:comments>
    <wfw:commentRss>http://www.c0t0d0s0.org/rss.php?version=2.0&amp;type=comments&amp;cid=3135</wfw:commentRss>
    

    <author>nospam@example.com (Joerg Moellenkamp)</author>
    <content:encoded><![CDATA[
    <a onclick="javascript: pageTracker._trackPageview('/extlink/soulfood.dk/');"  href="http://soulfood.dk/">Mads</a> pointed me to this good article written by Greg <a onclick="javascript: pageTracker._trackPageview('/extlink/blogs.sun.com/Gregp/entry/are_software_patents_useful');"  href="http://blogs.sun.com/Gregp/entry/are_software_patents_useful">regarding software patents</a>:<blockquote>Will we stop pursuing software patents on our software? Can't do that yet. That's simply because our competitors will still go for them, and unless our system changes, we'd have fewer "trading stamps" and end up paying even higher rates to indemnify the users of our software.</blockquote>At the end, the patent systems gone wild somewhere in the past in the software space. Even when you don´t like it, you have to go for it, as other would do it. And nobody would step back first, as all participants are in fear that all other market participants would use this as the competitive weapon. It´s the classical <a onclick="javascript: pageTracker._trackPageview('/extlink/en.wikipedia.org/wiki/Mexican_Standoff');"  href="http://en.wikipedia.org/wiki/Mexican_Standoff">mexican standoff</a>. 
    <img src="http://feeds.feedburner.com/~r/C0t0d0s0org-Technology/~4/316441292" height="1" width="1"/>]]></content:encoded>

    <pubDate>Tue, 15 May 2007 06:56:17 +0200</pubDate>
    <guid isPermaLink="false">http://www.c0t0d0s0.org/archives/3135-guid.html</guid>
    <category>patents</category>
<category>Technology</category>
<creativeCommons:license>http://creativecommons.org/licenses/by-sa/2.5/</creativeCommons:license>
<feedburner:origLink>http://www.c0t0d0s0.org/archives/3135-Greg-Papadopoulos-abot-software-patents.html</feedburner:origLink></item>
<item>
    <title>ChunkFS - solution or just a kludge</title>
    <link>http://feeds.feedburner.com/~r/C0t0d0s0org-Technology/~3/316441293/3102-ChunkFS-solution-or-just-a-kludge.html</link>
            <category>Technology</category>
    
    <comments>http://www.c0t0d0s0.org/archives/3102-ChunkFS-solution-or-just-a-kludge.html#comments</comments>
    <wfw:comment>http://www.c0t0d0s0.org/wfwcomment.php?cid=3102</wfw:comment>

    <slash:comments>1</slash:comments>
    <wfw:commentRss>http://www.c0t0d0s0.org/rss.php?version=2.0&amp;type=comments&amp;cid=3102</wfw:commentRss>
    

    <author>nospam@example.com (Joerg Moellenkamp)</author>
    <content:encoded><![CDATA[
    It´s a well known problem in the computer industry, that the needed time for filesystem checking will reach sooner or later unacceptable dimensions. This was one reason, why we developed ZFS. A number of mechanisms in the filesystem ensures an always consistent  state. The Linux community sees this problem as well. <br />
<br />
But this solution looks more like a kludge: <a onclick="javascript: pageTracker._trackPageview('/extlink/lwn.net/Articles/231585/');"  href="http://lwn.net/Articles/231585/">ChunkFS</a> divides a filesystem into up to 256 chunks that gets transparently merged into one user/application-visible filesystem. Every chunk is an filystem on it´s own. The idea behind this concept is, that you only need to check a few chunks and not the whole filesystem. This idea has some major drawbacks. At first i assume that in practice the fault isolation of chunkfs won´t reach the level you need to save substantial fscking time. <br />
<br />
It´s  only a short thoughtgame, but: The more write load you give to the filesystem the more chunks will be in "dirty state". The more write load you have on a filesystem, the more probable a inconsistent state will be, as the probability of disrupting an write operation in progress rises with the amount of write operations. So in my personal opinion you end with several "dirty" chunks and thus you won´t get such an big advantage. The more you need the mechanisms to shorten fsck time, the less ChunkFS would help you.<br />
<br />
The biggest advantage may be parallel fsck-ing of the chunks but this would pose a hge load to the storage systems although it would be interesting how to solve the dependencies between chunk (Imagine: Chunk A needs a consistent Chunk B, Chunk B needs a consistent Chunk A. How to solve this conflict without risking consistency of the whole filesystem) . Besides of this, it introduces new classes of problems like the creation of unique inodes over several file systems or the mentioned problem of interchunk dependencies.<br />
<br />
At the end, there is only one solution to problem of the growing fsck run times: Obsoleting filesystem checking at all. The most reasonable way to to this is by copy on write and transactional writes. Net Apps saw the problem and invented WAFL, Sun saw the problem and invented ZFS. I think it´s time for the Linux community to find a real solution and to step back of developing an questionable kludge. <br />
<br />
PS: The section 8 of this <a onclick="javascript: pageTracker._trackPageview('/extlink/cis.ksu.edu/~gud/docs/chunkfs-hotdep-val-arjan-gud-zach.pdf');"  href="http://cis.ksu.edu/~gud/docs/chunkfs-hotdep-val-arjan-gud-zach.pdf">shows a problem</a> that seems to be common within the Linux development community: Vast misunderstandings about the inner function of ZFS. There is no filesytem checking at ZFS, as the filesystem don´t need one, so . You can scrub the filesystem (in the widest and farthest sense similar to fsck, but this can be done online and it checks the validity of data <strong>and</strong> metadata by the checksums). As the people in the linux community tend to be intelligent to downright brilliant, i don´t understand this misunderstandings ... 
    <img src="http://feeds.feedburner.com/~r/C0t0d0s0org-Technology/~4/316441293" height="1" width="1"/>]]></content:encoded>

    <pubDate>Thu, 03 May 2007 20:24:55 +0200</pubDate>
    <guid isPermaLink="false">http://www.c0t0d0s0.org/archives/3102-guid.html</guid>
    <category>filesystems</category>
<category>linux</category>
<category>solaris</category>
<category>storage</category>
<category>Technology</category>
<category>unix</category>
<category>zfs</category>
<creativeCommons:license>http://creativecommons.org/licenses/by-sa/2.5/</creativeCommons:license>
<feedburner:origLink>http://www.c0t0d0s0.org/archives/3102-ChunkFS-solution-or-just-a-kludge.html</feedburner:origLink></item>
<item>
    <title>Gregs computing complexes</title>
    <link>http://feeds.feedburner.com/~r/C0t0d0s0org-Technology/~3/316441294/2364-Gregs-computing-complexes.html</link>
            <category>Technology</category>
    
    <comments>http://www.c0t0d0s0.org/archives/2364-Gregs-computing-complexes.html#comments</comments>
    <wfw:comment>http://www.c0t0d0s0.org/wfwcomment.php?cid=2364</wfw:comment>

    <slash:comments>0</slash:comments>
    <wfw:commentRss>http://www.c0t0d0s0.org/rss.php?version=2.0&amp;type=comments&amp;cid=2364</wfw:commentRss>
    

    <author>nospam@example.com (Joerg Moellenkamp)</author>
    <content:encoded><![CDATA[
    I really like the presentations and talks of Greg Papadoplos, but his blog entry about <a onclick="javascript: pageTracker._trackPageview('/extlink/blogs.sun.com/Gregp/entry/the_world_needs_only_five');"  href="http://blogs.sun.com/Gregp/entry/the_world_needs_only_five">"the five computing complexes"</a>  is a miss in a collection of hits by Greg.<br />
<br />
At first the internet is a collection of humans, and not a collection of consumers. It´s the old unterstandig of a few broadcasting company which controls the access to the communication between people. This time is long gone. <br />
<br />
I think, that in commercial applications we will see such an consolidation postulated by Greg. But as soon you take the consumer into consideration, you will see that he isn´t limited to the computing complexes. Google, Salesforce and Amazon are company. The are in the consumer focus today, but this is not a perpetual state. Customers are a very epheremal good.<br />
<br />
The model of the complexes is the old economy of large enterprises. The internet will bring us a completly different model of  economy. The economy of the future will be a fractal one. Today the single most successful application in Internet is fire sharing.  It´s a service enabled by the existence of a vast amount system in the internet at various people.  Okay, the actual form of this economy is based  on illegal transactions, but this is only the cause, because nobody found a way to commercialize it.  <br />
<br />
It´s my strong believe that the future of internet bases economy lies in clearinghouses that enables the commercialisation of a peer-to-peer-economy. They don´t have products, they don´t have interest, what is selled. They sell only rights. Rights to use a pair of shoes, rights to hear music or rights to read a book or the right to use a service. The way of distribution is irrelevant. The future of internet will be a serverless one. Or to say it differently: It´s full of servers. Every system is a server.<br />
<br />
At second, there would at least one additional computing complex. The Big Computer of Europe. Regarding data protection regulations the US and Europe could not be farther seperated than moon and earth.<br />
 
    <img src="http://feeds.feedburner.com/~r/C0t0d0s0org-Technology/~4/316441294" height="1" width="1"/>]]></content:encoded>

    <pubDate>Fri, 08 Dec 2006 12:06:44 +0100</pubDate>
    <guid isPermaLink="false">http://www.c0t0d0s0.org/archives/2364-guid.html</guid>
    <category>Technology</category>
<creativeCommons:license>http://creativecommons.org/licenses/by-sa/2.5/</creativeCommons:license>
<feedburner:origLink>http://www.c0t0d0s0.org/archives/2364-Gregs-computing-complexes.html</feedburner:origLink></item>
<item>
    <title>Overview of K8L</title>
    <link>http://feeds.feedburner.com/~r/C0t0d0s0org-Technology/~3/316441295/2358-Overview-of-K8L.html</link>
            <category>Technology</category>
    
    <comments>http://www.c0t0d0s0.org/archives/2358-Overview-of-K8L.html#comments</comments>
    <wfw:comment>http://www.c0t0d0s0.org/wfwcomment.php?cid=2358</wfw:comment>

    <slash:comments>0</slash:comments>
    <wfw:commentRss>http://www.c0t0d0s0.org/rss.php?version=2.0&amp;type=comments&amp;cid=2358</wfw:commentRss>
    

    <author>nospam@example.com (Joerg Moellenkamp)</author>
    <content:encoded><![CDATA[
    Jon Stokes of ars.technica wrote a nice summary of the stuff already known about the next gen core dubbed K8L:<a onclick="javascript: pageTracker._trackPageview('/extlink/arstechnica.com/news.ars/post/20061206-8363.html');"  href="http://arstechnica.com/news.ars/post/20061206-8363.html">A quick look at AMD's quad-core Barcelona</a>. 
    <img src="http://feeds.feedburner.com/~r/C0t0d0s0org-Technology/~4/316441295" height="1" width="1"/>]]></content:encoded>

    <pubDate>Thu, 07 Dec 2006 19:04:42 +0100</pubDate>
    <guid isPermaLink="false">http://www.c0t0d0s0.org/archives/2358-guid.html</guid>
    <category>amd</category>
<category>k8l</category>
<category>Technology</category>
<creativeCommons:license>http://creativecommons.org/licenses/by-sa/2.5/</creativeCommons:license>
<feedburner:origLink>http://www.c0t0d0s0.org/archives/2358-Overview-of-K8L.html</feedburner:origLink></item>

</channel>
</rss>
