Re: 820 DASD crashes

[Neil Palmer <neilp@xxxxxxxxxxx>]

I would be suspicious of a possible IOP or controller card failure (or 
maybe loose requiring reseating for a tight connection) if more than one 
disk fails at the same time.  Unless of course your disks are unionized 
and one went out in sympathy with the other  ;-)

...Neil





"Mark Villa" <markvilla@knology.net>
Sent by: owner-midrange-l@midrange.com
2001/06/25 08:21
Please respond to MIDRANGE-L

 
        To:     <MIDRANGE-L@midrange.com>
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        Subject:        820 DASD crashes


A shop using parity protection on a raid string is really not expecting an
820 a few months old to have 2 disks quit at the same moment in time. I am
not a math wiz by any stretch, but it would seem that with the mean time
between failure being such a large number the likelihood of that happening
without an external cause at the exact same moment is less than me being 
hit
by a comet in the next 5 minutes.

With that in mind, what is really the cause of multiple disk failures in 
one
raid string. Has this happened to someone you know? The UPS for the 820
comes to mind as a possible problem component.

Anybody know where to start looking online for listing of IBM HARDWARE 
under
the microscope as suspect? In other words not PTF's. I am thinking that
there is not such a listing for hardware since it is not as acceptable to
have a hardware quality problem as it is a PTF for a bug in software.


Thanks,

Mark Villa in Charleston SC.


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