Mac mini with 2 - 500GB drives running X serve

Hello - What is the best way to setup raid on a mac mini running 10.6.4x serve that does nothing but serve up netboot? Looking for suggestions..
Thanks

Xserve is hardware.
Xserve boxes can have in-board hardware RAID, depending on the particular system configuration.
Mac OS X Server software can boot and operate both on Xserve hardware and Mac Mini Server hardware.
Mac OS X client and Mac OS X Server both offer software-based RAID-1 capabilities.
Netboot is apparently how you're booting Mac OS X client or Mac OS X Server here; the Mac Mini Server box apparently isn't booting off its local disk(s).
If your Netboot image is set up up for and showing it is operating with mirroring once loaded into the Mac Mini Server, then you're running RAID. (Mirroring is software-based RAID-1, after all.)
Mac Mini Server boxes do not offer in-board hardware RAID capabilities, though there are various out-board hardware storage options with support for hardware RAID, in addition to the available software RAID option.
And for completeness, stay away from RAID-5; it has rotten failure modes, and it's getting more and more unreliable as the disk capacities increase. The likelihood of a secondary and catastrophic failure during a RAID rebuild increases with the capacity of the disks involved. (And you don't have enough disks to consider RAID-5 here anyway, but it's fairly common with out-board RAID.)
Also note that RAID is not an archival strategy. RAID protects against disk failures, and not against deletions, accidental operator error or malicious user activities, nor against volume or file corruptions.

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