RAID 5 Question - separate volume for OS/Apps: pros/cons

What are the pros & cons of having 2 volumes on a Mac Pro RAID 5 (instead of one big volume):
Vol 1: OS & Applications
Vol 2: Home Folders (basically everything else)
1) Is this a good idea/bad idea?
2) For what purposes would this setup be best used for?
3) At what point during the RAID 5 setup do you create multiple volumes and how is it done?
4) How/when do you set up the home directories to be on a separate volume from the OS/Apps volume and does the user have to do anything special during daily use to ensure they aren't saving/modifying anything on the OS/Apps volume?
5) I have four 250GB Barracudas sitting around and was wondering if they will work in a RAID 5 in my Mac Pro. I haven't heard of anyone using HDDs this small in a RAID 5 and Apple's website only talks about 500GB, 750GB, and 1TB in bays 2-4. Does anyone have this setup or know if it will work?
uryc hf bov-jna xrabov, lbh'er bhe bayl ubcr.

What are the pros & cons of having 2 volumes on a Mac Pro RAID 5 (instead of one big volume):
Vol 1: OS & Applications
Vol 2: Home Folders (basically everything else)
1) Is this a good idea/bad idea?
Bad. Using a separate drive (especially 10,000 rpm) for OS & Applications can be useful, but two volumes on the same drive (RAID behaves as one drive) means the heads have to continual move large distances, since home folders and system files are used a lot at the same time.
2) For what purposes would this setup be best used for?
If you often do things that destroy your system volume, you can quickly restore it from a backup copy, without having to worry if your user backup are completely up to date, but a separate system disk would still be better.
3) At what point during the RAID 5 setup do you create multiple volumes and how is it done?
After you create the RAID-5 with RAID Utility, create a volume and set its size to less than the default full size. You can then create more volumes. See page 8 of the RAID Userr Guide
<http://manuals.info.apple.com/en/RAIDUtility_UserGuide.pdf>
4) How/when do you set up the home directories to be on a separate volume from the OS/Apps volume and does the user have to do anything special during daily use to ensure they aren't saving/modifying anything on the OS/Apps volume?
For Tiger, use NetInfo Manager (Utilities folder). For Leopard, Right (or Control) click the user in "Accounts" system preference. Once set, the user doesn't have to do anything special.
5) I have four 250GB Barracudas sitting around and was wondering if they will work in a RAID 5 in my Mac Pro. I haven't heard of anyone using HDDs this small in a RAID 5 and Apple's website only talks about 500GB, 750GB, and 1TB in bays 2-4. Does anyone have this setup or know if it will work?
They should work. Apple only talks about drive sizes there were selling at the time the particular system was sold. If you have problems, though, Apple may blame the drives, and not provide much help.
uryc hf bov-jna xrabov, lbh'er bhe bayl ubcr.

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RAID 5 Question - separate volume for OS/Apps: pros/cons

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