[CentOS] RAID on Email Server

Matt wrote:
> Right now its running pretty good but here it is.
> Device:    rrqm/s wrqm/s   r/s   w/s  rsec/s  wsec/s    rkB/s    wkB/s
> avgrq-sz avgqu-sz   await  svctm  %util
> sda          0.60 142.80 67.20 170.20  678.40 2292.80   339.20
> 1146.40    12.52   118.53  615.66   4.21  99.92
>   

You have about 3 times more writing going on than reading. RAID1 isn't 
going to do much for you. You might want to try four disks in a RAID10 
instead. And put your mail folders and spool on partitions mounted using 
'noatime'.

-- 
Benjamin Franz