The STK ICEBERG has something they call RAID5+1. I am not sure exactly
how it works but they say that you can loose 3 drives before the CE
arrives to fix it and still not lose any data.
[EMAIL PROTECTED] wrote:
I don't know if it applies to Linux, but I vaguely remember a RAID 1+0
where
the data is both striped and mirrored. Is this superior to RAID 5? Also,
for
the very paranoid, I would guess that one could use a RAID 5+0 where the
data is striped w/parity like RAID 5, then each RAID 5 volume is mirrored.
This would seem very excessive, but very safe.
RAID0+1 is exactly as you described, a striped RAID0 array plus a mirror
of each drive. The downside to mirror is that you are "wasting" 1/2 of the
available DASD space. It's there only if you have a problem. With RAID5
you don't "waste" space. All the DASD space is useable (okay so not all,
but almost all). So it's a juggling act between cost for hardware and
protection.
I don't know if there is such a thing as RAID5+1.
Mark D Pace
Senior Systems Engineer
Mainline Information Systems
1700 Summit Lake Drive
Tallahassee, FL. 32317
[EMAIL PROTECTED]
Office: 850.219.5184
Fax: 850.219.5050
http://www.mainline.com
--
Stephen Frazier
Oklahoma Department of Corrections
