On 23/06/12 18:09, Andrzej A. Filip wrote:
On 06/23/2012 01:23 PM, Reindl Harald wrote:
Am 23.06.2012 13:09, schrieb Wojciech Puchar:
Finally i would recommend to get rid of RAID6. It's terribly slow on writes and writes are common on mail server. depends, it is slower than RAID5, but safer
Buy cheapest but largest SATA drive and use RAID1 (or RAID1+0) setup. oh no please do not recommend SATA crap with RAID1 and think it is faster than RAID6 - the additional writes doe snot mat if the whole disk-system is much faster and RAID1 has no benefit in performance
nobody will use SATA disks for high peformance servers in production - really nobody these days! Could you specify/define your idea of "high performance servers" land border? It may reduce the flame war.
Hi,
With dovecot, you can separate indexes and email, and with dbox/mdbox, have ALT storage, so for instance you could keep your indexes in a RAID10 of SSDs, recent email on a RAID10 of 10kRPM/15kRPM SAS drives, and older email can go on a load of 5k/7.2k SATA drives in RAID6, or on a NAS via NFS.
Note: with *dbox your indexes are the only place your mail flags are kept, so don't risk a single drive or even RAID5 for your index store.
This is what I am moving into production from dovecot 1.x on a single RAID6 array (hardware, LSI controller, 6 10k SAS drives in RAID10) which has served very well for a while but is not getting too small for all our mail. Performance has been good for up to 350 users, average mailbox size >4G, about 25-35k incoming mails per day.
Cheers
Alex
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