[Dovecot] XFS vs EXT4 for mail storage

[Stan Hoeppner]

On 5/2/2013 7:04 AM, Alessio Cecchi wrote:

> "rw,noatime,attr2,delaylog,nobarrier,inode64,noquota"
...
> and I'm running it on RHEL 6.4

I assume this is from /proc/mounts?  All of those but for noatime,
nobarrier, and inode64 are defaults.  You've apparently specified these
in /etc/fstab.  noatime is useless as relatime is the default.  Google
"XFS relatime vs noatime".

I assume you have a RAID controller or SAN head with [F|B]BWC and have
disabled individual drive write caches of array disks, given you've
disabled journal write barriers.  If drive caches are in fact enabled,
and/or you don't have [F|B]BWC, then journal write barriers need to be
enabled.  If not you're skydiving without a reserve chute.

-- 
Stan