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Why xfs can not mount use barrier option?

To: xfs@xxxxxxxxxxx
Subject: Why xfs can not mount use barrier option?
From: ch huang <justlooks@xxxxxxxxx>
Date: Wed, 15 May 2013 15:08:56 +0800
Delivered-to: xfs@xxxxxxxxxxx
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i use lvm on raid 1,/dev/CHVG01/conxfs is a logical volume,if i  mount with barrier,the /proc/mounts still show nobarrier option ,why? 

#  mount -t xfs -o barrier,attr2,noikeep,inode64 /dev/CHVG01/conxfs  /opt/contest/
# cat /proc/mounts
/dev/CHVG01/conxfs /opt/contest xfs rw,attr2,nobarrier,inode64,noquota 0 0
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