XServe with 3 x 500Gb Drives - RAID 5 Possible ?

Hi Guys,
My supplier is telling me we can chuck 3 x 500Gb drives into a standard dual processor Xserve and then raid 5 them like we usually do on our larger raids with 6 or so disks.
I have a feeling this is not possible normally. On the website it says - "AppleRAID software RAID supports RAID 0 and 1 with online rebuilding; optional PCI hardware RAID controller"
I take it I will need the "optional PCI hardware RAID controller" ??? to acheive raid 5 ?
I'll do a bit more looking around and see if I can find the answer but if anyone knows...
Regards
Mitch

Not sure about the performance increase but I would say yes, as we'll be using a Hardware raid card to talk to the drives.
The Mirroring you've done is a software "raid". I have done it this way before with our other Xserves with 2 drives but seeing we have the opportunity to do it with the raid card I believe it's the way to go.
If we lose a drive the others take over seemlessly (Ihope!)
Others here who already have their Xsrvs doing this will post I hope to back me up or let us both know the correct answer. I am still waiting for the money to order mine !
Mitch

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