RAID type suggestion

[Patrick T. Tsang]

Hello,

We have a low-end platform of using Core2duo (Xeon) with 4G ram.
The budget is not much enough to afford SAN.
We consider SAS finally, but are still having concerns about mail access speed.

This RAID could be:
1. RAID 1 (OS) + RAID 1 (mail spool)
2. RAID 1 (OS) + RAID 5 (mail spool)
3. RAID 50, for OS and mail
4. RAID 10, for OS and mail 

Option 1 is found difficult to expand its mail spool
RAID 5 is not good for speed, but it can expand
RAID 50 speed is much slower than RAID 10, but RAID 10 is very expensive


Anyone here can provide suggestions?

Thanks
Patrick


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