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Old 10-10-2008, 05:10 PM
Default RAID on Email Server

I have an email server running Exim, Dovecot, Spamassassin, Clam, etc.
on Centos 4.x 32bit. On occasion I have disk I/O problems. Its
handling several domains and alot of email. Its currently on a single
SATA drive. I am thinking of moving too 3 drives with RAID 1 for
redundancy. RAID 1 will help me on reads but do nothing on writes as
I understand. I am thinking the majority of my I/O is read though
not? I imagine quotta checks and all that being done and everytime a
user checks there email every message in the inbox must be read.

I guess I am asking if RAID 1 will help my I/O problem much?

[root@server ~]# w
12:04:02 up 2:01, 1 user, load average: 7.02, 7.47, 11.84
root pts/0 11:25 0.00s 0.02s 0.00s w
[root@server ~]# vmstat
procs -----------memory---------- ---swap-- -----io---- --system-- ----cpu----
r b swpd free buff cache si so bi bo in cs us sy id wa
0 2 0 1558496 456916 1087224 0 0 198 749 795 537 18 4 27 50

The above is when its running pretty good.

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