Ideal Promise RAID config for Network Home Directories

Just got my Promise RAID installed. The Advanced Logical Drive config gives way more options than the xServe it replaced, which has me wondering… What thoughts do people have on the ideal configuration for hosting Network Home Directories?

My plan is to create two Level 5 RAIDs (four drives each) with one logical drive on each, one primarily for Network Home folders and one to hold the automatic nightly backup of the first.

Do people have suggestions or preferences for stripe and sector sizes? I know that this varies by application; I don’t know i there’s a “best” setting for Network Home usage in general, or if that will depend largely on what kind of work those users are doing.

Any and all thoughts are appreciated.

Thanks,

Jeff