>just use RAID 5 or 10 for storing the mailboxes and also for SQL
uh, not RAID5 !!! :)))
Here's a quote, today coincidentally, from the developer of postfix
in the postfix user list:
>"Postfix I/O is dominated by random writes, which gives the worst
>possible performance with RAID 5 systems.
>
>Wietse"
(That previous word is his first name)
Now, "postfix i/o" is the same as Imail i/o is the same as any mail
server's i/o:
mailq files + log files + mailbox files.
The best RAID for a mail system is RAID 0 + 1 (striping over
multiple disks + mirror of the stripe disk sets).
And since disk i/o dominates mail server performance, it's best to
have multiple independent disk channels for 1) system + logging, 2)
mailboxes 3) mailq
Easier said that bought! Get out your check books!
Len
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