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	<title>Luc de Louw&#039;s Blog &#187; barrier</title>
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		<title>Confused about write barriers on file systems&#8230;</title>
		<link>http://blog.delouw.ch/2009/11/01/confused-about-write-barriers-on-file-systems/</link>
		<comments>http://blog.delouw.ch/2009/11/01/confused-about-write-barriers-on-file-systems/#comments</comments>
		<pubDate>Sun, 01 Nov 2009 06:30:48 +0000</pubDate>
		<dc:creator>Luc de Louw</dc:creator>
				<category><![CDATA[Linux]]></category>
		<category><![CDATA[barrier]]></category>
		<category><![CDATA[ext3]]></category>
		<category><![CDATA[Filesystems]]></category>
		<category><![CDATA[Reliability]]></category>
		<category><![CDATA[RHEL]]></category>

		<guid isPermaLink="false">http://blog.delouw.ch/?p=83</guid>
		<description><![CDATA[As ext3 is already known as a very robust file system why is the default mount option still barrier=0? The problem is LVM and the device mapper. They  do not support barriers. When mounting ext3 on a LV, the option barrier=1 it should be ignored and a warning written. So far so good. Trying this brings [...]]]></description>
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