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RE: Soft-RAID and Hard-RAID?

Thanks for the explanation and the links!

-----Original Message-----
From: Kok-Yong Tan [mailto:email@hidden]
Sent: Monday, April 29, 2002 2:36 PM
To: email@hidden
Subject: 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.
--
Reality Artisans, Inc.
P.O. Box 565, Gracie Station
New York, NY 10028-0019
http://www.realityartisans.com
"We craft ideas into reality"
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