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Have you ever lost 2 drives? I have, complete system restore required.
I had only 4 drives in a RAID-5 set. Shut the system off, after a
complete backup, for UPS maintenance. Thank God I did the complete
system backup prior to shutting off a 3 year old system that was never
shut completely down before. Don't think that RAID-5 means you will
not loose the entire ASP.


Chris Bipes
Director of Information Services
CrossCheck, Inc.


-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx
[mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Evan Harris
Sent: Friday, January 16, 2009 2:33 PM
To: 'Midrange Systems Technical Discussion'
Subject: RE: Crashed system

Hi Chris

Once upon a time (pre-RAID) storing the journal receivers in a separate
ASP
- isolating the storage for them - could be used as part of a recovery
strategy. With no RAID and the disk technology in use there were some
pretty compelling reasons for doing this.

In the event that an individual disk failed (think good old 3370's or
better yet 9332/600's), only the ASP where that disk resided was
compromised. Thus you had a situation where either the journal receivers
were intact in a secondary ASP and you could recover and apply all your
transactions up to when the system went down, OR your journal receivers
were toast but your data libraries were intact and you could continue
working after the system was recovered (some messing about required, of
course).

The recovery involved doing a RCLSTG if I remember rightly but it was a
pretty effective way to recover right up to the last transaction IF you
had isolated the receivers in a second ASP. In fact I think at one stage
receivers were the only objects you COULD put in an ASP.

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