I've had an instance where the directory of the system volume got corrupted and I had to reinstall the system, but did not have to reload the user data because it was still intact on disk. Since the user volume held 95% of the system diskspace I saved OODLES of time in recovery.
I've also had an instance where the directory of one of the user volumes got hosed and I only had to VSCLOSE, SCRATCHVOL, NEWSET, NEWVOL each disk, and stream the appropriate BULDJOB1 followed by RESTORE's of the accounts involved (I sure hope I got that in the right order).
Another advantage in my mind is that TM logfile is memory space assigned to a certain size per volumeset, and it is much easier to manage that asset when your applications are divided up by volumeset and what sort of function they are. It is easy to help yourself performance-wise (and hurt yourself too) by making changes to the size and therefore the amount of memory dumped to disk at each checkpoint for that volume. It deserves a lot of research and planning...
Howard
-----Original Message-----
From: Donna Garverick [mailto:[log in to unmask]]
Sent: Tuesday, March 18, 2003 11:57 AM
To: [log in to unmask]
Subject: Re: [HP3000-L] Volume sets on MPE
Denys Beauchemin wrote:
> Does the system crash is a non-MPEXL_SYSTEM_VOLUME_SET volume fail?
('twould be curious to see a whole volume fail all at once... :-)
having lived thru a number of disc failures....i don't remember <blush> it may be one of
those 'it depends' kinda things. seems to me the system will certainly hang.... if a
process is marked 'critical' and is wanting to access something on the failed drive, then
yeah <ka-flooey> - d
--
Donna Garverick Sr. System Programmer
925-210-6631 [log in to unmask]
Come, my friends, 'Tis not too late to seek a newer world.
Tho' much is taken, much abides; and tho'
We are not now that strength which in old days
Moved earth and heaven, that which we are, we are.
"Ulysses", A. Tennyson
>>>MY opinions, not Longs Drug Stores'<<<
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