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...slower than a RAID 1 with writes). > 32 gb ram > > > option 2 > os and mail queue : 4 X 600 gb 15k rpm raid 10 Those 15k HDDs tend to be expensive. Estimate your expected writes per day (iostat on an existing server can give you some hints) and get 2 SSDs instead, DC S3520s if 1 DWPD is sufficient, DC S3610s if you need 3 DWPD (doubtful), S3710 if you need 10 DWPD (very doubtful). Similar for Samsung DC level SSDs, check their specs. For example, my busiest mailbox servers only write about 250KB/s averaged, which mean about 50GB/day and thus would be a fit even for a small S...

thanks for your help happy to say that the performance dramatically improved after i use the high performance settings from here http://wiki.dovecot.org/LoginProcess grep Login: /var/log/mail.log.1 |wc -l with the mail.log being of a typical, busy day. 412992 i also picked up the imap and pop3 connections during peak hours [root at ns1 domains]# doveadm who | awk

On 09/08/2017 01:31 PM, hw wrote: > Mark Haney wrote: > > I/O is not heavy in that sense, that?s why I said that?s not the > application. > There is I/O which, as tests have shown, benefits greatly from low > latency, which > is where the idea to use SSDs for the relevant data has arisen from.? > This I/O > only involves a small amount of data and is not sustained