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  • Subject: Re: RAID question
  • From: Larry Bolhuis <lbolhui@xxxxxxx>
  • Date: Fri, 04 Sep 1998 13:25:59 -0400
  • Organization: Arbor Solutions, Inc

> >This gives more DASD than if the new drives were irrored, but are they
> >really protected?  If so, why am I seeing all 4194 MB?
> >We are at V4R1.
> 
> Good question.  In this case, the system only spread the parity over the
> base four drives.  If you turned RAID off and then back again on (in which
> case Murphy would have a disk failure at the exact moment of no
> protection), parity would be spread over all six drives, up to a maximum of
> 8 on the disk controller on your system with just the base controllers.
> 
> Al

  I gotta go against the short guy here <bg>.  The RAID Striping will
only be on the first four or the first eight depending on how many
drives are in the set when RAID is initialized.  It will not
automatically convert from 4 to 8 when the set reaches 8 drives.  You'd
have to do what Al suggests above to get the striping to change once the
set included at least 8 units.

  Larry Bolhuis
  Arbor Solutions, Inc
  lbolhui@ibm.net
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