The most common setup I see is:
Raid 1 for the OS disk, RAID 5 for the data disk(s).
This way your OS can take a hit from hardware failure and it's recoverable. The data disks are striped with raid 5, giving you better performance for the app and still fault tolerant.
As Mike mentioned, RAID 10 is the best of both. Raid 0 gives you performance + Raid 1 mirrors that for fault tolerance. The downside is it will require the most disks/diskspace.
Just curious, why software raid? Does the server have a controller that does RAID on a hardware level?
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