dovecot - May 2010 - mail location filesystem noatime, nodiratime?

Will Dovecot be negatively impacted if I change my XFS mount options to
noatime,nodiratime?

Thanks.

-- 
Stan

My install uses XFS with noatime on all mount points and works
perfectly... I haven't tried it with nodiratime yet apparently.. I
thought I had that option in my fstab already, but after checking I
guess not.

-Greg

On 2010-05-19 6:50 AM, Stan Hoeppner wrote:
> Will Dovecot be negatively impacted if I change my XFS mount options to
> noatime,nodiratime?
> 
> Thanks.
> 
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> Will Dovecot be negatively impacted if I change my XFS mount options to
> noatime,nodiratime?
How are the mails stored on your XFS filesystem? For Maildir, there is no
problem using these mount options. I'm using

    noatime,nodiratime,nobarrier,logbufs=8

for mounting XFS filesystems on all my dovecot servers for years without
any problems. Mailstorage is Maildir (written by exim not dovecot lda but
this should not matter).

nobarrier is enabled because I use RAID systems with battery backed write
cache.

logbufs=8 does increase performace for deleting mails (e.g. for expiring
the Spam folder) if XFS log is internal (the default). If you have
configured a separate, external partion for XFS log, this might not be
necessary.

Heiko

Heiko Schlichting                Freie Universit?t Berlin
heiko.schlichting at fu-berlin.de   Zentraleinrichtung f?r Datenverarbeitung
Telefon +49 30 838-54327         Fabeckstra?e 32
Telefax +49 30 838454327         14195 Berlin

On 19.5.2010, at 16.39, Gregory Finch wrote:
> My install uses XFS with noatime on all mount points and works
> perfectly... I haven't tried it with nodiratime yet apparently.. I

noatime also implicitly enables nodiratime. No need to specify both.

And yeah, Dovecot doesn't need automatic atime updates. It does use atimes
to scan once in a while for some temp files that have been left lying around,
but it explicitly changes the atime afterwards.