Your best bet at restoration is to do as Kris suggests. I would not,
under any circumstances, restore directly to the corrupted file pool
from the DDR backup unless it was taken while the file pool was down and
before the corruption occurred. Even then, you would back level all
files and catalog entries that were updated between the time of the
backup and the restore. Since we are an active 24 hours per day shop,
we can never use DDR as a potential backup process for our SFS.
We had a problem a few years ago with a corrupted catalog block that
required the help of the support center. The block was corrupted during
a data center move and the corruption caused the system to crash
whenever any file whose catalog entry was in the corrupted block was
referenced. Getting past this one required that we send a copy of the
catalog disk to the support center so that they could craft a zap to
bypass the bad entries. It took two tries to get it right because the
first zap just handled the failing file at the time of the crashes, all
of which were during attempts to backup the same file. After bypassing
the bad block we did a filepool unload, created an all new filepool, and
did a filepool reload to the new location/disks.
In short, if you open a PMR with the support center, they may be able to
perform some magic for you. Without them, we would have lost several
days of updates instead of just the 19 files that were identified as
having entries in the corrupted block.
Good Luck,
Richard Schuh
________________________________
From: The IBM z/VM Operating System
[mailto:ib...@listserv.uark.edu] On Behalf Of Phillip Parmelee
Sent: Tuesday, December 23, 2008 5:21 AM
To: IBMVM@LISTSERV.UARK.EDU
Subject: SFS Restore?
I've never worked with SFS before. The SFS was designed and put
into 24x7 production use circa 1996. There are few trails to follow.
Presently there is a daily backup of the system plus weekly DDR's of the
volumes. Due to production I cannot shutdown for much more time than the
backup takes. I need to restore or somehow obtain a program (deleted by
a programmer), and only that file. The manuals I have found are not too
clear regarding recovery/restore of SFS. Can one file be easily obtained
from a backup?
Phil
