Node: linux.setaoffice.com
Node Type : Intel/AMD x64(HTTPS)
Severity : minor
OM Server Time: 2015-09-28 08:42:14
Message : EXT4-fs: (dm-9): barriers disabled
Msg Group : OS
Application : dmsg_mon
Object : EXT4
Event Type :
not_foundInstance Name :
not_foundInstruction : No
I mounted a new filesystem that I just set up with nobarrier parameter in /etc/fstab. It logged the following message on /var/log/messages
root@linux:~ # grep barrier /var/log/messages
Sep 28 09:39:11 linux kernel: EXT4-fs (dm-9): barriers disabled
RHEL 6 Storage Administration Guide – 22.2. Enabling/Disabling Write Barriers
I removed all the references to nobarrier parameter
root@linux:~ # cat /etc/fstab
#
# /etc/fstab
# Created by anaconda on Mon Jun 24 13:57:59 2013
#
# Accessible filesystems, by reference, are maintained under ‘/dev/disk’
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
#
/dev/mapper/rootvg-rootlv / ext4 defaults,nobarrier 1 1
/dev/mapper/rootvg-auditlv /audit ext4 defaults,nobarrier 1 2
UUID=4fdc0716-230e-4c5d-a3fe-ba2196bf6c21 /boot ext3 defaults 1 2
/dev/mapper/rootvg-optlv /opt ext4 defaults,nobarrier 1 2
/dev/mapper/rootvg-tmplv /tmp ext4 defaults,nobarrier 1 2
/dev/mapper/rootvg-usrlv /usr ext4 defaults,nobarrier 1 2
/dev/mapper/rootvg-userslv /usr/users ext4 defaults,nobarrier 1 2
/dev/mapper/rootvg-varlv /var ext4 defaults,nobarrier 1 2
/dev/mapper/rootvg-crashlv /var/crash ext3 defaults,nobarrier 1 2
/dev/mapper/rootvg-swaplv swap swap defaults 0 0
tmpfs /dev/shm tmpfs defaults 0 0
devpts /dev/pts devpts gid=5,mode=620 0 0
sysfs /sys sysfs defaults 0 0
proc /proc proc defaults 0 0
/dev/mapper/rootvg-repolv /repo ext4 defaults,nobarrier 1 2
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