I would say that RAID 5 is probably overkill for a mail queue. Unless ur mail queue is running hundreds of gigabytes and overloading a single disk, a normal single hard drive is sufficient. Based on ur graph it looks like ur queue is under half a gig. If you want redundancy for the mail queue then a RAID 1 (mirroring) will give u everything u need. RAID 5 is for extremely high usage like large file servers and stuff. Adding RAM to beef up the file cache can give u a significant speedup (Ur entire queue can be RAM cache). If u still need RAID 5 then I would make the stripe size equal to average file size / number of data disks up to no more than 32KB stripe.
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