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	<title>vnull&#039;s blog &#187; Linux</title>
	<atom:link href="http://jakub.wartak.pl/blog/?feed=rss2&#038;cat=5" rel="self" type="application/rss+xml" />
	<link>http://jakub.wartak.pl/blog</link>
	<description>by Jakub Wartak</description>
	<lastBuildDate>Thu, 20 May 2010 12:53:07 +0000</lastBuildDate>
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	<language>en</language>
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			<item>
		<title>Storage migration for ASM database deployed on Oracle Enterprise Linux in Oracle VM without downtime.</title>
		<link>http://jakub.wartak.pl/blog/?p=102</link>
		<comments>http://jakub.wartak.pl/blog/?p=102#comments</comments>
		<pubDate>Thu, 21 May 2009 18:12:35 +0000</pubDate>
		<dc:creator>admin</dc:creator>
				<category><![CDATA[Linux]]></category>
		<category><![CDATA[Oracle ASM]]></category>
		<category><![CDATA[OracleVM]]></category>
		<category><![CDATA[SAN]]></category>
		<category><![CDATA[XEN]]></category>

		<guid isPermaLink="false">http://vnull.pcnet.com.pl/blog/?p=102</guid>
		<description><![CDATA[Suppose you wanted to migrate your database from storage array SAN1 to SAN2 without downtime. With Oracle databases using ASM this is possible. It was performed on configuration better described here. One note: the LUN can be visible through dom0 or directly by domU (by passing PCI hardware handling into our domU VM) &#8212; this [...]]]></description>
		<wfw:commentRss>http://jakub.wartak.pl/blog/?feed=rss2&amp;p=102</wfw:commentRss>
		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>Fincore &#8211; how to monitor VM cache (A.K.A. what&#8217;s inside)</title>
		<link>http://jakub.wartak.pl/blog/?p=116</link>
		<comments>http://jakub.wartak.pl/blog/?p=116#comments</comments>
		<pubDate>Thu, 21 May 2009 18:09:40 +0000</pubDate>
		<dc:creator>admin</dc:creator>
				<category><![CDATA[Linux]]></category>

		<guid isPermaLink="false">http://vnull.pcnet.com.pl/blog/?p=116</guid>
		<description><![CDATA[Back in November 2008, I&#8217;ve asked question how to monitor VM cache performance (cache hit ratio) under Linux on Kevin Closson&#8217;s blog. Now I&#8217;ve just found utility that allows to show pretty nicely what *is* in VM cache. The utility is called &#8220;fincore&#8221;, it is written in Python and has some strange Python/perl dependecies, but [...]]]></description>
		<wfw:commentRss>http://jakub.wartak.pl/blog/?feed=rss2&amp;p=116</wfw:commentRss>
		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>Oracle Clusterware 11g addNode.sh ONS bug (with GDB fun &amp; solution)</title>
		<link>http://jakub.wartak.pl/blog/?p=103</link>
		<comments>http://jakub.wartak.pl/blog/?p=103#comments</comments>
		<pubDate>Mon, 26 Jan 2009 19:38:23 +0000</pubDate>
		<dc:creator>admin</dc:creator>
				<category><![CDATA[Linux]]></category>
		<category><![CDATA[Oracle]]></category>

		<guid isPermaLink="false">http://vnull.pcnet.com.pl/blog/?p=103</guid>
		<description><![CDATA[Yesterday I&#8217;ve added new node for one of Clusterware installations. I&#8217;ve decided to use addNode.sh script. Unfortunatley after adding new node (prac2) to cluster, kernel reported every few seconds segmentation fault of ONS daemon. Here&#8217;s how one can use some in depth knowledge to solve such problems (OS: Oracle Enterprise Linux 5.1, Clusterware: 11.1.0.6, platform: [...]]]></description>
		<wfw:commentRss>http://jakub.wartak.pl/blog/?feed=rss2&amp;p=103</wfw:commentRss>
		<slash:comments>2</slash:comments>
		</item>
		<item>
		<title>My article about Extended RAC is finally public (on OTN)</title>
		<link>http://jakub.wartak.pl/blog/?p=90</link>
		<comments>http://jakub.wartak.pl/blog/?p=90#comments</comments>
		<pubDate>Tue, 11 Nov 2008 18:55:47 +0000</pubDate>
		<dc:creator>admin</dc:creator>
				<category><![CDATA[Linux]]></category>
		<category><![CDATA[Oracle]]></category>
		<category><![CDATA[OracleVM]]></category>
		<category><![CDATA[XEN]]></category>
		<category><![CDATA[cluster]]></category>

		<guid isPermaLink="false">http://vnull.pcnet.com.pl/blog/?p=90</guid>
		<description><![CDATA[In case you would like to experiment with Extended RAC cluster my article on OTN should be helpful. Enjoy!
]]></description>
		<wfw:commentRss>http://jakub.wartak.pl/blog/?feed=rss2&amp;p=90</wfw:commentRss>
		<slash:comments>1</slash:comments>
		</item>
		<item>
		<title>Raising Oracle VM&#8217;s maximal number of interfaces in domU</title>
		<link>http://jakub.wartak.pl/blog/?p=89</link>
		<comments>http://jakub.wartak.pl/blog/?p=89#comments</comments>
		<pubDate>Sat, 02 Aug 2008 12:49:37 +0000</pubDate>
		<dc:creator>admin</dc:creator>
				<category><![CDATA[Linux]]></category>
		<category><![CDATA[Networking]]></category>
		<category><![CDATA[OracleVM]]></category>
		<category><![CDATA[XEN]]></category>

		<guid isPermaLink="false">http://vnull.pcnet.com.pl/blog/?p=89</guid>
		<description><![CDATA[Just edit /boot/grub/menu.lst and add &#8220;netloop.nloopbacks=X&#8221;. Sample file after modification:
title Oracle VM Server vnull02
root (hd0,0)
kernel /xen.gz console=ttyS0,57600n8 console=tty dom0_mem=512M
module /vmlinuz-2.6.18-vnull02_8.1.6.0.18.el5xen ro root=/dev/md0 netloop.nloopbacks=8
module /initrd-2.6.18-vnull02_8.1.6.0.18.el5xen.img
]]></description>
		<wfw:commentRss>http://jakub.wartak.pl/blog/?feed=rss2&amp;p=89</wfw:commentRss>
		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>OracleVM (XEN) network performance</title>
		<link>http://jakub.wartak.pl/blog/?p=87</link>
		<comments>http://jakub.wartak.pl/blog/?p=87#comments</comments>
		<pubDate>Mon, 31 Mar 2008 19:20:41 +0000</pubDate>
		<dc:creator>admin</dc:creator>
				<category><![CDATA[Linux]]></category>
		<category><![CDATA[Networking]]></category>
		<category><![CDATA[OracleVM]]></category>
		<category><![CDATA[XEN]]></category>

		<guid isPermaLink="false">http://vnull.pcnet.com.pl/blog/?p=87</guid>
		<description><![CDATA[In OracleVM (virtualization product for x86 and x86_64 from Oracle, which is based on OpenSource XEN) one can pin individual VirtualMachines(later called just VMs) to dedicated CPU cores. This can give great potential win if XEN scheduler (dom0) doesn&#8217;t have to switch VMs between CPU or cores. Also you can modify default MTU (1500) settings [...]]]></description>
		<wfw:commentRss>http://jakub.wartak.pl/blog/?feed=rss2&amp;p=87</wfw:commentRss>
		<slash:comments>3</slash:comments>
		</item>
		<item>
		<title>Oracle&#8217;s EM Grid Control on CentOS5/RHEL5: libdb.so.2 issue and resolution</title>
		<link>http://jakub.wartak.pl/blog/?p=79</link>
		<comments>http://jakub.wartak.pl/blog/?p=79#comments</comments>
		<pubDate>Sun, 25 Nov 2007 11:59:50 +0000</pubDate>
		<dc:creator>admin</dc:creator>
				<category><![CDATA[Linux]]></category>
		<category><![CDATA[Oracle]]></category>

		<guid isPermaLink="false">http://vnull.pcnet.com.pl/blog/?p=79</guid>
		<description><![CDATA[CentOS5 and RHEL5 comes without libdb.so.2 library (old Sleepycat database software). The problem is that there is no RPM for this library in the repositories (newest is only compat-db-4.3 which provides libdb4-3.so). Oracle&#8217;s EM installer fails about libdb.so.2 with:

Resolution which worked for me was to install Redhat 7.3 db1 package(!). Binary compability seems to work:

[root@oemgc [...]]]></description>
		<wfw:commentRss>http://jakub.wartak.pl/blog/?feed=rss2&amp;p=79</wfw:commentRss>
		<slash:comments>3</slash:comments>
		</item>
		<item>
		<title>My engineering work&#8230;</title>
		<link>http://jakub.wartak.pl/blog/?p=73</link>
		<comments>http://jakub.wartak.pl/blog/?p=73#comments</comments>
		<pubDate>Wed, 15 Aug 2007 10:05:00 +0000</pubDate>
		<dc:creator>admin</dc:creator>
				<category><![CDATA[J2EE]]></category>
		<category><![CDATA[Linux]]></category>
		<category><![CDATA[Oracle]]></category>
		<category><![CDATA[SAN]]></category>
		<category><![CDATA[Solaris]]></category>
		<category><![CDATA[cluster]]></category>

		<guid isPermaLink="false">http://vnull.pcnet.com.pl/blog/?p=73</guid>
		<description><![CDATA[As of May I&#8217;m very busy architecting &#38; implementing cluster for Java Enterprise Edition on comodity hardware (mainly x86_32 based) for my engineering work &#8211; to obtain BEng title. Our subject is:
&#8220;Web service based on scalable and highly available J2EE application cluster&#8221;. We have team consisting of 4 persons in which I&#8217;m responsible for all [...]]]></description>
		<wfw:commentRss>http://jakub.wartak.pl/blog/?feed=rss2&amp;p=73</wfw:commentRss>
		<slash:comments>2</slash:comments>
		</item>
		<item>
		<title>Solaris x86 customized Jumpstart from Linux NFS server &#8212; NFSv4 problem and solution</title>
		<link>http://jakub.wartak.pl/blog/?p=71</link>
		<comments>http://jakub.wartak.pl/blog/?p=71#comments</comments>
		<pubDate>Fri, 06 Jul 2007 12:38:59 +0000</pubDate>
		<dc:creator>admin</dc:creator>
				<category><![CDATA[Linux]]></category>
		<category><![CDATA[Solaris]]></category>

		<guid isPermaLink="false">http://vnull.pcnet.com.pl/blog/?p=71</guid>
		<description><![CDATA[There is some kind of incompatibility between Linux 2.6 NFSv4 server nad Solaris 10 (U3) NFSv4 client. On installed Solaris you can put some variables into /etc/default/nfs and it should work, but when you are trying to bootstrap from Linux NFS server using Jumpstart you have to search for another solution:
1) Build a new miniroot [...]]]></description>
		<wfw:commentRss>http://jakub.wartak.pl/blog/?feed=rss2&amp;p=71</wfw:commentRss>
		<slash:comments>3</slash:comments>
		</item>
		<item>
		<title>Links for 23/04/2007</title>
		<link>http://jakub.wartak.pl/blog/?p=50</link>
		<comments>http://jakub.wartak.pl/blog/?p=50#comments</comments>
		<pubDate>Mon, 23 Apr 2007 12:16:31 +0000</pubDate>
		<dc:creator>admin</dc:creator>
				<category><![CDATA[Linux]]></category>
		<category><![CDATA[VMware]]></category>

		<guid isPermaLink="false">http://vnull.pcnet.com.pl/blog/?p=50</guid>
		<description><![CDATA[MySQL performance/scalability on Linux vs FreeBSD; or simply why Linux sucks when it comes to MySQL ?
ESX performance tunning guide
CREST (Council of Registered Ethical Security Testers)
]]></description>
		<wfw:commentRss>http://jakub.wartak.pl/blog/?feed=rss2&amp;p=50</wfw:commentRss>
		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>Forced linux shutdown</title>
		<link>http://jakub.wartak.pl/blog/?p=46</link>
		<comments>http://jakub.wartak.pl/blog/?p=46#comments</comments>
		<pubDate>Fri, 23 Mar 2007 14:09:26 +0000</pubDate>
		<dc:creator>admin</dc:creator>
				<category><![CDATA[Linux]]></category>

		<guid isPermaLink="false">http://vnull.pcnet.com.pl/blog/?p=46</guid>
		<description><![CDATA[Some time ago i noticed huge corruption on / on one of my servers, /sbin/reboot was gone also with /sbin/init, /sbin/poweroff and so on.
How to shutdown machine remotley ? Simple:
echo 1 &#62; /proc/sys/kernel/sysrq
echo o &#62; /proc/sysrq-trigger
( this requires SysRQ compiled in kernel, most distributions have this
compiled in their&#8217;s kernels )
]]></description>
		<wfw:commentRss>http://jakub.wartak.pl/blog/?feed=rss2&amp;p=46</wfw:commentRss>
		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>Nice site: benchmarks of GFS,GNBD,OCFS2</title>
		<link>http://jakub.wartak.pl/blog/?p=45</link>
		<comments>http://jakub.wartak.pl/blog/?p=45#comments</comments>
		<pubDate>Fri, 23 Mar 2007 13:52:22 +0000</pubDate>
		<dc:creator>admin</dc:creator>
				<category><![CDATA[Linux]]></category>
		<category><![CDATA[cluster]]></category>

		<guid isPermaLink="false">http://vnull.pcnet.com.pl/blog/?p=45</guid>
		<description><![CDATA[Mostly English site dedicated to benchmarking clustering filesystems DistributedMassStorage
]]></description>
		<wfw:commentRss>http://jakub.wartak.pl/blog/?feed=rss2&amp;p=45</wfw:commentRss>
		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>Exporting simple file from Linux target to Solaris initiatior using iSCSI</title>
		<link>http://jakub.wartak.pl/blog/?p=44</link>
		<comments>http://jakub.wartak.pl/blog/?p=44#comments</comments>
		<pubDate>Fri, 23 Mar 2007 13:24:10 +0000</pubDate>
		<dc:creator>admin</dc:creator>
				<category><![CDATA[Linux]]></category>
		<category><![CDATA[SAN]]></category>
		<category><![CDATA[Solaris]]></category>

		<guid isPermaLink="false">http://vnull.pcnet.com.pl/blog/?p=44</guid>
		<description><![CDATA[QuickHowTo about &#8221;exporting&#8221; via iSCSI simple file from Linux target (ietd) to Solaris OS:
Linux target is running Debian/4.0, 2.6.18 kernel and iSCSI target version 0.4.14 &#8211; I wish it was Solaris box, but my very old home SCSI controllers aren&#8217;t supported by Solaris ( DELL MegaRAID 428 &#8211; PERC2 and InitIO ) &#8211; however there are some drivers but for Solaris 2.7-2.8, but after small war with them I must say that I [...]]]></description>
		<wfw:commentRss>http://jakub.wartak.pl/blog/?feed=rss2&amp;p=44</wfw:commentRss>
		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>Kilka ciekawych linkow (Clustered Samba, CCIE.PL ciekawy post, drogie urzadzenia SAN ;) )</title>
		<link>http://jakub.wartak.pl/blog/?p=42</link>
		<comments>http://jakub.wartak.pl/blog/?p=42#comments</comments>
		<pubDate>Sun, 18 Mar 2007 13:19:24 +0000</pubDate>
		<dc:creator>admin</dc:creator>
				<category><![CDATA[Linux]]></category>
		<category><![CDATA[SAN]]></category>
		<category><![CDATA[cluster]]></category>

		<guid isPermaLink="false">http://vnull.pcnet.com.pl/blog/?p=42</guid>
		<description><![CDATA[Samba nigdy zbytnio mnie nie interesowala ( bo nie interesowal mnie fakt udostepniania przestrzeni Windowsom   ) aczkolwiek ciekawie zapowiada sie klastrowana Samba.
Na forum CCIE.PL jest bardzo ciekawy wpis ( autor: pjeter ) ktory opisuje mniej wiecej sciaganie obrazu z tunera TV z kablowki i rzucanie tego na multicast w czasie rzeczywistym ( z [...]]]></description>
		<wfw:commentRss>http://jakub.wartak.pl/blog/?feed=rss2&amp;p=42</wfw:commentRss>
		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>Linux RAID write intent bitmap / data-scrubbing</title>
		<link>http://jakub.wartak.pl/blog/?p=35</link>
		<comments>http://jakub.wartak.pl/blog/?p=35#comments</comments>
		<pubDate>Sun, 18 Mar 2007 12:38:34 +0000</pubDate>
		<dc:creator>admin</dc:creator>
				<category><![CDATA[Linux]]></category>

		<guid isPermaLink="false">http://vnull.pcnet.com.pl/blog/?p=35</guid>
		<description><![CDATA[Post z dnia: 05/03/2007
http://www.gentoo-wiki.info/HOWTO_Install_on_Software_RAID#Write-intent_bitmap
Wlasnie sie dowiedzialem ze:

&#8220;A write-intent bitmap is used to record which areas of a raid component have been modifed since the raid array was
last in sync. Basically, the raid driver periodically writes out a small table recording which portions of a
raid component have changed. Therefore, if you lose power before all drives [...]]]></description>
		<wfw:commentRss>http://jakub.wartak.pl/blog/?feed=rss2&amp;p=35</wfw:commentRss>
		<slash:comments>2</slash:comments>
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