Failed internal mirrored drive - why didn't server stay up?

"Cohen, Andy" <[email protected]>
Newsgroups gmane.os.tru64.managers
Message-ID <[email protected]> 
Greetings all!
 
We have a DS20E running Tru64 5.1 pk6.  It is configured with two
internal (system) disks that are mirrored by LSM.  Overnight one of
these two mirrored disks failed.  Unfortunately, this brought the system
down.  Isn't the point have having mirrored drives to prevent a
single-point of failure?  i.e., shouldn't the system have kept running
with just the one good remaining disk?  Or am I misunderstanding what
LSM does?
 
Thanks!
Andy
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