Javier de Miguel Rodríguez
javierdemiguel at us.es
Tue Nov 8 16:29:02 EET 2011
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.
> Am Dienstag, 8. November 2011, 15:15:39 schrieb Javier de Miguel Rodríguez:
>> 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
> Yes, that#s the main reason why I want to switch to mbox. At the moment our
> roundtrip-time for the backup is> 24h...
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