Using separate drive for OS and RAID for data

We have an xServe with 3x1Tb drives set up as RAID 5. I read in one of the forums that it's not a particularly good idea to create separate OS/Apps and data volumes on it. Is there a way therefore of utilising a fourth drive and direcly attaching that as the bootable OS/Apps drive?
Is this possible? Is it a viable solution?

Hi
Yes it is possible, as a viable solution? It depends? I've done this a number of times with an external firewire drive that is the boot drive. FW800 is obviously quicker than FW400. Whichever it is you are adding latency nevertheless. Ultimately its better to do this with internal drives as they will always be quicker which you will see in improved server performance.
What I have done in the past is to RAID Mirror or Stripe (using DU) 2x500GB as well as 2x750GB and even 2x1TB drives. The other bay has a single 80GB drive as the boot drive. Clone this boot drive periodically to an external FW drive. If the boot drive fails, boot from the cloned FW drive. You can run the server like that until a replacement drive can be fitted. Clone back and you should be back to normal.
As you have a RAID card installed, for RAID 5 you need a minimum of three drives, there is not much scope as you have already filled up all your bays.
Tony

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