How can I set up a Mac pro with internal Raid 5

I have a Mac pro running Leopard server. I would like to format 3 of the drives as an internal Raid 5.
Can this be done?
Can it be done without an internal Raid card?
or
Can it be done if I install a Mac Pro Raid card?
Thanks,
RT

RAID5 or RAID10 or such does require add-on software and / or add-on hardware, yes.
And I'd tend to go toward external RAID storage here, as that is what the most common packages offer and as that tends to have the greatest expansion. This would involve a PCIe RAID controller and external storage here, though Apple does offer the Mac Pro RAID card for use with the internal drives.
The integrated Apple software RAID has RAID0 and RAID1 capabilities. Not RAID5.
As for any additional questions, here's [the FAQ|http://support.apple.com/kb/HT1346] for the Mac Pro RAID card, and here is [the manual|images.apple.com/server/docs/RAIDUtility_UserGuide.pdf].
External RAID can involve Apple Xsan and Promise and related, or third-party FC SAN storage, or any of various third-party direct-attach storage (DAS) options.

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