In article <[log in to unmask]>,
[log in to unmask] says...
>
>Mark Ranft <[log in to unmask]>
>
>>It is true that a failure on a User Volume will hang the system.  However,
>>while you are placing the call to HP and waiting for the CE to arrive and
>>repair the drive, you can bring the system back up and allow the users not
>>affected by the down volume set to run.
>>
>>Of course, when HP arrives you will once again have to =SHUTDOWN the
>>system.
>
><snip>
>
>Nonsense, you don't have to =SHUTDOWN the system again -- just power up the
>drives in the affected volume set; they'll AVR nicely then go through the XM
>recovery process.
>
> -- Evan
 
Evan,
 
Your statement assumes a LOT.
 
In my experience, a down drive usually means unit replacement.
HP will attempt to recover the data on the drive by using a
Disc-Tape-Disc copy procedure that is run on a system that
has been brought up in SINGLE-USER, SINGLE-DISC mode.  This
requires a =SHUTDOWN.
 
Even in the event of a bad power supply, HP will certainly
recommend against powering up a drive while users are actively
updating databases other portions of the system.  This is true
even if the drive (or the affected volume set) is isolated on
its own channel.
 
Granted...  9 times out of 10, what you say may work,
but I would rather get the system idled down instead of
taking the chance that a stray interrupt would get to
the system bus and cause a System Abort.
 
Mark Ranft
General Mills, Inc.
[log in to unmask]
 
 
 
Maybe so, IF the replaced disc is on its on channel (SCSI, FW, HP-IB or HP-FL).
However,
it is usually impossible