Re: RAID config for mailboxes host
Emmanuel Halbwachs wrote (ao):
> Let this physical server:
>
> Dell R710
> 2x6 cores 2.3 GHz
> 48 GB RAM
> 12 disks 600 GB, 15 ktr/min
> only one RAID card H700
>
> for the usage of a rather small mailhost:
>
> MDA
> IMAP/POP for 1500 mailboxes (Maildir)
> webmail
> (MX are other machines)
>
> We consider two RAID config for the 12 disks:
>
> A 2 disks RAID 1 for system
> 10 disks RAID 6 for mailbox space
>
> B 12 disks RAID 6 for the whole
>
> In A, we lose 1.2 (raw) TB with respect to B. Advocates of A say that
> in B, the heads read/write activity of the mailboxes will seriously
> impact the system performance. In A, the system has its own axes,
> separate from the mailboxes ones.
I would go for scenario B. If your workload is too much for the system,
you are screwed in both scenario A and B anyway, and in B you have extra
spindles.
Btw, any reason you go with spinning disks and not with SSDs like Intel
710/720? SSDs are a good fit for maildir workload (random IO).
Sander
--
Humilis IT Services and Solutions
http://www.humilis.net
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