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RE: Soft-RAID and Hard-RAID?

At 11:08 -0500 04/29/2002, Oliver Block wrote:
If you need extra speed AND safety, you may want to check out RAID-5 arrays
which use a type of striping AND mirroring and need only a fraction of the
hard disk space used by RAID-1. I'm sure someone else on the list can
explain how RAID-5 works better than I can, so I won't even try.

Uh...while your RAID-0 and RAID-1 explanations are absolutely correct, RAID-5 doesn't work that way. What you're describing as RAID-5 is actually RAID-0+1 or RAID-10. Here's a couple of URLs that explain it quite clearly:

http://www.enhance-tech.com/t/raiddef.html
http://www.mylex.com/documents/raid_levels.htm

Another pro/con argument is that RAID-1 is great if you absolutely need to be up 100% of the time, and not just 99.99999% of the time (assuming you have hot-swappable bays) but it is expensive, obviously. RAID-3 through RAID-5 is great if you don't have to be up 100% of the time but still need protection against drive failure (because even if you have hot-swappable bays, it takes time to rebuild the data after you swap out the bad drive with a blank good drive: the rebuild time being dependent on how much data was on the RAID system before one drive went bad).

Hope this helps.
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New York, NY 10028-0019
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 >RE: Soft-RAID and Hard-RAID? (From: Oliver Block <email@hidden>)



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