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It is interesting that Chris Shank has got LINUX working with these IBM drives
(kudos to you, Chris) - and surprising that you were able to get the planar
back plane to function. I know on the AS400 that you can purchase different
Controller cards for the disk for "better than RAID protection". This is for
99.999999..% uptime. RAID on Disk or Redundant RAID is great, but what if the
transaction you are writing is still in the controller card (not yet on disk)
during failure or the card itself begins to fail? True, Full Write-Commit in
your S/W app should be done, but the risk exposure in this layer of H/W can
actually be addressed.
There is a controller card you can purchase that comes with "redundacy" with
the writing process executing in two, not one sub-processors. (according to
IBM Marketing) I think these "controller cards for the AS400" are also handed
off the RAID striping work so that OS400 and the main CPU does not need to
worry about these H/W details.
Also, I know of one OS400 fix which was explained to me as a "fix for drive
failures during startup - After a power failure, the drives would fail during
spinup. The drives would spin so fast that they injured themselves, so in the
DOWNLOADED SOFTWARE FIX, we control the rotational speeds of the drives during
shutdown and startup USING SOFTWARE". (I found this way cool. And if anyone
can explain THIS to me, or if they know of any other box that has this kind of
H/W programming, please let me know.)
So Chris, if you got something more than just the hard drives working, I would
love to tell my co-horts at the local AS/400 Discussion Forum, DVCUG. And we
should tell them of your Redhat LIN-UX/400 box. Maybe even come up with a
converter kit for the many old boxes businesses have here in Philly, which are
quite a few. I may be able to get you even more AS400s for you to play with -
although I don't know if you want to go down that road. ;o)
Discussion Forum http://groups.yahoo.com/group/dvcug/
Home Page http://www.DVCUG.org
............... John Voris ...............
IBM Certified Specialist,
iSeries Technical Solutions Designer
mailto:jvoris@axs2000.net
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