concerning dovecot settings for high volume server

Alessio Cecchi alessio at
Thu Sep 17 15:56:07 UTC 2015

Hi Urban,

I'm interesting in your hardware configuration, in percent how much is 
the I/O on indexes volume and how in maildata volume?

Without index on SSD you will be able to run 28k users on RAID10 
(SATA/SAS) only?

I'm evaluating if store indexes, on my configuration, on SSD for 
improving performance.


Il 14/09/2015 09:47, Urban Loesch ha scritto:
> Hi Rajesh,
> our setup looks as follows:
> - we are running linux-vserver as virtualization technology
> - we have 2 dedicated IMAP/POP3 Proxies in front of 8 dovecot containers.
> - totally about 2900 concurrent imap sessions on each imap proxy and about 180 concurrent pop3 sessions
> - all dovecot containers are running on the same hardware (no problems until today):
> 	DELL PER720 with 2x 200GB RAID 1 SSD's for dovecot indexes, 8x 4TB RAID 10 for maildata, 2x300GB RAID1 for OS
> 	64GB RAM, 2x CPU E5-2640 0 @ 2.50GHz

Alessio Cecchi

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