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  3. June 2002

RE: disk arms (was RE: Tips for user ASP)

Charley,

IBM RAID at least used to be striped in 16mb stripes. example:

DRIVE#1                 DRIVE#2 Drive#3 Drive#4
16mb Stripe# Data/Raid  Data/Raid
1                       D               D       D               R
2                       D               D       R               D
3                       D               R       D               D
4                       R               D       D               D

I don't know if this is true anymore or not, but this looks better for 
performance

__________________________________________________
Kirk Goins
IBM Certified iSeries Technical Solutions Expert
Pacific Information Systems - An IBM Premier Business Partner
503-674-2985           kirkg@pacinfosys.com


-----Original Message-----
From: Charly Jones [mailto:charly301@hotmail.com]
Sent: Friday, June 28, 2002 10:39 AM
To: midrange-l@midrange.com
Cc: lbolhuis@arbsol.com
Subject: RE: disk arms (was RE: Tips for user ASP)




Currently, RAID information is put on one "end" of the disk.  Inner ring or
outer ring, I don't know.  "Real" data (mine and yours) gets put on the
other.  So the only thing that is between RAID bits and real bits is the
empty space.  The empty space is bigger on empty disks.

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