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	<title>Blog O' Matty &#187; Linux Storage</title>
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	<description>Blog O' Matty</description>
	<lastBuildDate>Wed, 16 May 2012 00:16:36 +0000</lastBuildDate>
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		<item>
		<title>Installing ZFS on a CentOS 6 Linux server</title>
		<link>http://prefetch.net/blog/index.php/2012/02/13/installing-zfs-on-a-centos-6-linux-server/</link>
		<comments>http://prefetch.net/blog/index.php/2012/02/13/installing-zfs-on-a-centos-6-linux-server/#comments</comments>
		<pubDate>Mon, 13 Feb 2012 10:00:54 +0000</pubDate>
		<dc:creator>matty</dc:creator>
				<category><![CDATA[Linux Storage]]></category>

		<guid isPermaLink="false">http://prefetch.net/blog/?p=5579</guid>
		<description><![CDATA[As most of my long term readers know I am a huge Solaris fan. How can&#8217;t you love an Operating System that comes with ZFS, DTrace, Zones, FMA and Network Virtualization amongst other things? I use Linux during my day job, and I&#8217;ve been hoping for quite some time that Oracle would port one or [...]]]></description>
		<wfw:commentRss>http://prefetch.net/blog/index.php/2012/02/13/installing-zfs-on-a-centos-6-linux-server/feed/</wfw:commentRss>
		<slash:comments>5</slash:comments>
		</item>
		<item>
		<title>Another interesting finding about gluster replicas</title>
		<link>http://prefetch.net/blog/index.php/2011/11/30/another-interesting-finding-about-gluster-replicas/</link>
		<comments>http://prefetch.net/blog/index.php/2011/11/30/another-interesting-finding-about-gluster-replicas/#comments</comments>
		<pubDate>Wed, 30 Nov 2011 13:04:09 +0000</pubDate>
		<dc:creator>matty</dc:creator>
				<category><![CDATA[Linux Gluster]]></category>
		<category><![CDATA[Linux Storage]]></category>

		<guid isPermaLink="false">http://prefetch.net/blog/?p=5184</guid>
		<description><![CDATA[In a previous post I talked about my problems getting gluster to expand the number of replicas in a volume. While experimenting with the gluster utilities &#8220;add-brick&#8221; option I wanted to see if adding two more bricks would replicate the existing data across four bricks (two old, two new), or if the two new bricks [...]]]></description>
		<wfw:commentRss>http://prefetch.net/blog/index.php/2011/11/30/another-interesting-finding-about-gluster-replicas/feed/</wfw:commentRss>
		<slash:comments>5</slash:comments>
		</item>
		<item>
		<title>Removing a gluster volume doesn&#8217;t remove the volume&#8217;s contents</title>
		<link>http://prefetch.net/blog/index.php/2011/11/27/removing-a-gluster-volume-doesnt-remove-the-volumes-contents/</link>
		<comments>http://prefetch.net/blog/index.php/2011/11/27/removing-a-gluster-volume-doesnt-remove-the-volumes-contents/#comments</comments>
		<pubDate>Sun, 27 Nov 2011 15:31:45 +0000</pubDate>
		<dc:creator>matty</dc:creator>
				<category><![CDATA[Linux Gluster]]></category>
		<category><![CDATA[Linux Storage]]></category>

		<guid isPermaLink="false">http://prefetch.net/blog/?p=5083</guid>
		<description><![CDATA[I made another interesting discovery this weekend while playing around with the gluster volume deletion option. Prior to creating a volume with a new layout, I went through the documented process to remove my volume: $ gluster volume stop glustervol01 Stopping volume will make its data inaccessible. Do you want to continue? (y/n) y Stopping [...]]]></description>
		<wfw:commentRss>http://prefetch.net/blog/index.php/2011/11/27/removing-a-gluster-volume-doesnt-remove-the-volumes-contents/feed/</wfw:commentRss>
		<slash:comments>2</slash:comments>
		</item>
		<item>
		<title>Some interesting insights on the gluster replicated volume replica value</title>
		<link>http://prefetch.net/blog/index.php/2011/11/27/some-interesting-insights-on-the-gluster-replicated-volume-replica-value/</link>
		<comments>http://prefetch.net/blog/index.php/2011/11/27/some-interesting-insights-on-the-gluster-replicated-volume-replica-value/#comments</comments>
		<pubDate>Sun, 27 Nov 2011 14:05:17 +0000</pubDate>
		<dc:creator>matty</dc:creator>
				<category><![CDATA[Linux Gluster]]></category>
		<category><![CDATA[Linux Storage]]></category>

		<guid isPermaLink="false">http://prefetch.net/blog/?p=5077</guid>
		<description><![CDATA[While playing around with gluster, I had an interesting finding about the way gluster handles replicated volumes. The gluster volume I am using for testing is a replicated volume with a replica factor of 2 (the replica factor determines how many copies of your data will be made). I wanted to add a third replica [...]]]></description>
		<wfw:commentRss>http://prefetch.net/blog/index.php/2011/11/27/some-interesting-insights-on-the-gluster-replicated-volume-replica-value/feed/</wfw:commentRss>
		<slash:comments>6</slash:comments>
		</item>
		<item>
		<title>Centos 6 Linux VMs running inside vSphere 4.1 appear to dynamically discover new LUNs</title>
		<link>http://prefetch.net/blog/index.php/2011/11/27/centos-6-linux-vms-running-inside-vsphere-4-1-appear-to-dynamically-discover-new-luns/</link>
		<comments>http://prefetch.net/blog/index.php/2011/11/27/centos-6-linux-vms-running-inside-vsphere-4-1-appear-to-dynamically-discover-new-luns/#comments</comments>
		<pubDate>Sun, 27 Nov 2011 12:50:57 +0000</pubDate>
		<dc:creator>matty</dc:creator>
				<category><![CDATA[Linux Storage]]></category>
		<category><![CDATA[VMWare ESX Server]]></category>

		<guid isPermaLink="false">http://prefetch.net/blog/?p=5075</guid>
		<description><![CDATA[I came across an interesting discovery yesterday while working on a CentOS 6 gluster node. The node was virtualized inside vSphere 4.1 and needed some additional storage added to it. I went into the VI client and added a new disk while the server was running, expecting to have to reboot or]]></description>
		<wfw:commentRss>http://prefetch.net/blog/index.php/2011/11/27/centos-6-linux-vms-running-inside-vsphere-4-1-appear-to-dynamically-discover-new-luns/feed/</wfw:commentRss>
		<slash:comments>3</slash:comments>
		</item>
		<item>
		<title>Defragmenting EXT4 file systems with e4defrag (coming soon to a distribution near you)</title>
		<link>http://prefetch.net/blog/index.php/2011/11/04/defragmenting-ext4-file-systems-with-e4defrag-coming-soon-to-a-distribution-near-you/</link>
		<comments>http://prefetch.net/blog/index.php/2011/11/04/defragmenting-ext4-file-systems-with-e4defrag-coming-soon-to-a-distribution-near-you/#comments</comments>
		<pubDate>Fri, 04 Nov 2011 14:13:22 +0000</pubDate>
		<dc:creator>matty</dc:creator>
				<category><![CDATA[Linux Storage]]></category>

		<guid isPermaLink="false">http://prefetch.net/blog/?p=4740</guid>
		<description><![CDATA[If you have been around the systems engineering field you have probably read about file system fragmentation at some point. This typically occurs when files are randomly updated over time, and the blocks that comprise the file get scattered over different areas of the disk. This causes the drives to perform more work since the [...]]]></description>
		<wfw:commentRss>http://prefetch.net/blog/index.php/2011/11/04/defragmenting-ext4-file-systems-with-e4defrag-coming-soon-to-a-distribution-near-you/feed/</wfw:commentRss>
		<slash:comments>2</slash:comments>
		</item>
		<item>
		<title>Using rpcdebug to debug Linux NFS client and server issues</title>
		<link>http://prefetch.net/blog/index.php/2011/11/02/using-rpcdebug-to-debug-linux-nfs-client-and-server-issues/</link>
		<comments>http://prefetch.net/blog/index.php/2011/11/02/using-rpcdebug-to-debug-linux-nfs-client-and-server-issues/#comments</comments>
		<pubDate>Wed, 02 Nov 2011 12:31:23 +0000</pubDate>
		<dc:creator>matty</dc:creator>
				<category><![CDATA[Linux NFS]]></category>
		<category><![CDATA[Linux Storage]]></category>

		<guid isPermaLink="false">http://prefetch.net/blog/?p=4716</guid>
		<description><![CDATA[Debugging NFS issues can sometimes be a chore, especially when you are dealing with busy NFS servers. Tools like nfswatch and nfsstat can help you understand what operations your server is servicing, but sometimes you need to get into the protocol guts to find out more info. There are a couple of ways you can [...]]]></description>
		<wfw:commentRss>http://prefetch.net/blog/index.php/2011/11/02/using-rpcdebug-to-debug-linux-nfs-client-and-server-issues/feed/</wfw:commentRss>
		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>Using wireshark&#8217;s protocol decoding to debug NFS problems</title>
		<link>http://prefetch.net/blog/index.php/2011/11/01/using-wiresharks-protocol-decoding-to-debug-nfs-problems/</link>
		<comments>http://prefetch.net/blog/index.php/2011/11/01/using-wiresharks-protocol-decoding-to-debug-nfs-problems/#comments</comments>
		<pubDate>Tue, 01 Nov 2011 23:48:03 +0000</pubDate>
		<dc:creator>matty</dc:creator>
				<category><![CDATA[Linux NFS]]></category>
		<category><![CDATA[Linux Storage]]></category>

		<guid isPermaLink="false">http://prefetch.net/blog/?p=4724</guid>
		<description><![CDATA[Most admins have probobably encountered a situation where someone says &#8220;hey this really bizarre thing is occurring.&#8221; Whenever I am approached to look at these types of issues I will typically start by jumping on my systems and reviewing system, network and performance data. Once I&#8217;ve verified those are within normal levels I will begin [...]]]></description>
		<wfw:commentRss>http://prefetch.net/blog/index.php/2011/11/01/using-wiresharks-protocol-decoding-to-debug-nfs-problems/feed/</wfw:commentRss>
		<slash:comments>3</slash:comments>
		</item>
		<item>
		<title>Getting the number of bytes read and written by your Linux NFS kernel threads (nfsd)</title>
		<link>http://prefetch.net/blog/index.php/2011/10/28/getting-the-number-of-bytes-read-and-written-by-your-linux-nfs-kernel-threads-nfsd/</link>
		<comments>http://prefetch.net/blog/index.php/2011/10/28/getting-the-number-of-bytes-read-and-written-by-your-linux-nfs-kernel-threads-nfsd/#comments</comments>
		<pubDate>Fri, 28 Oct 2011 21:59:57 +0000</pubDate>
		<dc:creator>matty</dc:creator>
				<category><![CDATA[Linux NFS]]></category>
		<category><![CDATA[Linux Storage]]></category>

		<guid isPermaLink="false">http://prefetch.net/blog/?p=4678</guid>
		<description><![CDATA[Linux NFS server implementations export a number of statistics through the /proc file system. The nfsstat utility can parse this file and display various performance counters, and the data that is displayed comes from the /proc/net/rpc/nfsd proc entry: $ cat /proc/net/rpc/nfsd rc 0 2585 290 fh 0 0 0 0 0 io 1069882 10485760 th [...]]]></description>
		<wfw:commentRss>http://prefetch.net/blog/index.php/2011/10/28/getting-the-number-of-bytes-read-and-written-by-your-linux-nfs-kernel-threads-nfsd/feed/</wfw:commentRss>
		<slash:comments>2</slash:comments>
		</item>
		<item>
		<title>Checking ext3 file system consistency on production systems</title>
		<link>http://prefetch.net/blog/index.php/2011/10/15/checking-ext3-file-system-consistency-on-production-systems/</link>
		<comments>http://prefetch.net/blog/index.php/2011/10/15/checking-ext3-file-system-consistency-on-production-systems/#comments</comments>
		<pubDate>Sat, 15 Oct 2011 13:02:52 +0000</pubDate>
		<dc:creator>matty</dc:creator>
				<category><![CDATA[Linux Storage]]></category>

		<guid isPermaLink="false">http://prefetch.net/blog/?p=3173</guid>
		<description><![CDATA[As an admin, there is nothing worse that the feeling you get when you determine you are dealing with file system corruption. Wether it&#8217;s a lost inode or a corrupted superblock, I always get a big knot in my stomach when I figure out that corruption exists. With modern file systems like ZFS it&#8217;s trivial [...]]]></description>
		<wfw:commentRss>http://prefetch.net/blog/index.php/2011/10/15/checking-ext3-file-system-consistency-on-production-systems/feed/</wfw:commentRss>
		<slash:comments>2</slash:comments>
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