[Dovecot] Performance-Tuning

[Javier de Miguel Rodríguez]

     Other important thing to consider is message expunging. With mdbox 
you are "delaying" the I/O associated with deleting e-mails. We have a 
nightly cronjob that expunge messages from mdboxes.

     If you have en EVA (wich one? 4.400? 6.400? ) you also can consider 
RAID 1+0 or SSD for indexes. Indexes are hammered in mdbox.

     Regards

     Javier

> Am Dienstag, 8. November 2011, 15:15:39 schrieb Javier de Miguel Rodríguez:
>
>
> Hi,
>
>>       If you have CPU to spare, consider using zlib with mdbox. You are
>> trading CPU power (cheap) to get fewer IOPS (IOPS count is expensive).
> Hey. This point is great. I hadn't realized that.
>
> Sure. zlib will save IOPS and 2x6-CPUs aren't a problem. Good point -thanks.
>
>> compressed) and backup software is happier because there are few
>> (100.000+ files with mdbox) to backup instead of several millions
>> (Maildir)
> Yes, that#s the main reason why I want to switch to mbox. At the moment our
> roundtrip-time for the backup is>  24h...
>
>
> Peer
>
>