[CentOS] /proc/mounts always shows "nobarrier" option for xfs, even when mounted with "barrier"
Tom Georgoulias
tomg at mcclatchyinteractive.comThu Jan 21 21:04:48 UTC 2010
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Ran into a confusing situation today. When I mount an xfs filesystem on a server running centos 5.4 x86_64 with kernel 2.6.18-164.9.1.el5, the barrier/nobarrier mount option as displayed in /proc/mounts is always set to "nobarrier" Here's an example: [root at host ~]# mount -o nobarrier /dev/vg1/homexfs /mnt [root at host ~]# grep xfs /proc/mounts /dev/vg1/homexfs /mnt xfs rw,attr2,nobarrier,noquota 0 0 [root at host ~]# mount | grep xfs /dev/mapper/vg1-homexfs on /mnt type xfs (rw,nobarrier) [root at host ~]# mount -o barrier /dev/vg1/homexfs /mnt [root at host ~]# grep xfs /proc/mounts /dev/vg1/homexfs /mnt xfs rw,attr2,nobarrier,noquota 0 0 [root at host ~]# mount | grep xfs /dev/mapper/vg1-homexfs on /mnt type xfs (rw,barrier) Can anyone else confirm this behavior? Thanks, Tom
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