Re: CPU for Dovecot
Hi, thanks to all for advices. We will choose the 8core variant. About IO notes... there will be local 10k SASes in RAID 10, similar configuration as we have now and works fine. Kind regards, Miloslav Dne 25.11.2016 v 14:29 Miloslav Hůla napsal(a): we are planning to change hardware for our standalone Dovecot instance handling ~5800 IMAP users with 1TB mailboxes on local RAID. Is there some recommendation about CPU? We can choose from: - Intel Xeon E5-2620v4 - 2,1GHz@8,0GT 20MB cache, 8core, HT, 85W, LGA2011 - Intel Xeon E5-2623v4 - 2,6GHz@8,0GT 10MB cache, 4core, HT, 85W, LGA2011 The difference is about more cores vs. hi frequency.
Re: CPU for Dovecot
Den 25. nov. 2016 14:29, skrev Miloslav Hůla: > Hi, > > we are planning to change hardware for our standalone Dovecot instance > handling ~5800 IMAP users with 1TB mailboxes on local RAID. Is there > some recommendation about CPU? > > We can choose from: > - Intel Xeon E5-2620v4 - 2,1GHz@8,0GT 20MB cache, 8core, HT, 85W, > LGA2011 > - Intel Xeon E5-2623v4 - 2,6GHz@8,0GT 10MB cache, 4core, HT, 85W, > LGA2011 > > The difference is about more cores vs. hi frequency. As far as I can see, high frequency costs more than more cores, so the 2623 is more geared towards interactive use, or single-threaded servers (like a single java thread). 50% reduction in number of cores gets you only a few percent increase in frequency. Go with 2620 for mail server.
Re: CPU for Dovecot
> Xeon E5-2620v4 - 2,1GHz@8,0GT 20MB cache, 8core, HT, 85W, LGA2011 passmark: 16825 cost: 417$ > Xeon E5-2623v4 - 2,6GHz@8,0GT 10MB cache, 4core, HT, 85W, LGA2011 passmark: 8302 cost: 444$ I would get the first one. On Fri, Nov 25, 2016 at 2:29 PM, Miloslav Hůla <'miloslav.h...@gmail.com'> wrote: Hi, we are planning to change hardware for our standalone Dovecot instance handling ~5800 IMAP users with 1TB mailboxes on local RAID. Is there some recommendation about CPU? We can choose from: - Intel Xeon E5-2620v4 - 2,1GHz@8,0GT 20MB cache, 8core, HT, 85W, LGA2011 - Intel Xeon E5-2623v4 - 2,6GHz@8,0GT 10MB cache, 4core, HT, 85W, LGA2011 The difference is about more cores vs. hi frequency. Thank you, Miloslav
Re: CPU for Dovecot
Em 25/11/16 11:29, Miloslav Hůla escreveu: Hi, we are planning to change hardware for our standalone Dovecot instance handling ~5800 IMAP users with 1TB mailboxes on local RAID. Is there some recommendation about CPU? We can choose from: - Intel Xeon E5-2620v4 - 2,1GHz@8,0GT 20MB cache, 8core, HT, 85W, LGA2011 - Intel Xeon E5-2623v4 - 2,6GHz@8,0GT 10MB cache, 4core, HT, 85W, LGA2011 The difference is about more cores vs. hi frequency. Generally speaking, servers will benefith from more cores instead of faster cores. Servers usually are doing LOTS of things, and thus more cores use to be better. Unless you know you'll be doing something heavily CPU intensive, which generally mail related things are not. Even more important than choosing more cores x higher frequency, you should focus on faster I/O. This, specially on mail servers, can do a REAL difference ! -- Atenciosamente / Sincerily, Leonardo Rodrigues Solutti Tecnologia http://www.solutti.com.br Minha armadilha de SPAM, NÃO mandem email gertru...@solutti.com.br My SPAMTRAP, do not email it
CPU for Dovecot
Hi, we are planning to change hardware for our standalone Dovecot instance handling ~5800 IMAP users with 1TB mailboxes on local RAID. Is there some recommendation about CPU? We can choose from: - Intel Xeon E5-2620v4 - 2,1GHz@8,0GT 20MB cache, 8core, HT, 85W, LGA2011 - Intel Xeon E5-2623v4 - 2,6GHz@8,0GT 10MB cache, 4core, HT, 85W, LGA2011 The difference is about more cores vs. hi frequency. Thank you, Miloslav
