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  2. MI400
  3. August 2002

RE: Reverse of XOR.

>From: James H. H. Lampert [mailto:jamesl@hb.quik.com]
>This, by the way, is why XOR operations are often used for graphics

And more relevant to the iSeries, XOR is the basis for RAID-5 disk
subsystems. Given three drives:

Bit     Drive1  Drive2  Drive3
1       1               1               0
2       1               0               1
3       0               0               1
4       0               1               1

Etc. Remove (crash) any one of those drives and you can recover the data on
it by XOR-ing the data on the other two drives.

-Walden


------------
Walden H Leverich III
President
Tech Software
(516) 627-3800 x11
(208) 692-3308 eFax
WaldenL@TechSoftInc.com
http://www.TechSoftInc.com

Quiquid latine dictum sit altum viditur.
(Whatever is said in Latin seems profound.)

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