From: Harald.Knipp@bfa.de
Date: Mon Sep 02 2002 - 12:07:44 EDT
Hi all,
perhaps some of you remember my question two weeks ago
concerning the possibility to restore a multi-volume
advfs domain with a crashed disk. The problem was in short that we tried to
dd the reactivated
crashed disk to the new disk. The attempt to restore the domain then
crashed the whole server (AS 2000 with 4.0e).
(See my summary:
http://www.xray.mpe.mpg.de/mailing-lists/tru64-unix-managers/2002-08/msg00248.html
)
Not only since then I´m a little paranoid with multi volume AdvFS domains.
If you have
n disks in a domain, for example, mounted on a single mount point,
the possibiliy to loose the data in a whole file-system grows at least by
n.
And now the real nightmare comes to me:
Since last week there are two EMC (Symmetrix 8450) Boxes connected to one
of
our AS 1200, running Tru64 V. 5.1a.
The configuration of the EMC is: all disks mirrored (RAID 1), 4 disks make
up a logical volume
(stripe in EMC speak, I think) of 32 GB. All logical volumes are connected
to the AS 1200 via a
KGPSA FC card (two connections to each box).
Now infinite horror starts: we have 78 (!!) disks from the EMC now (about
2.5 TB)
and the backup people want me to put _all_ disks
in one single advfs file domain so that they can see the whole storage
under one mount point. The reason (they told me) is that their backup
software cannot handle
multiple mountpoints as one backup area. (BTW: the backup software is
sesam2000).
Questions:
- Am I to paranoid (should I take Prosac)? If not:
- Any ideas or hints to make this configuration safer (e.g. by using LSM)?
- Is it easier to restore a crashed multivolume domain with the new AdvFS
version?
- Any experiences with the above mentioned EMC configuration?
How reliable are these boxes in such a configuration?
TIA,
Harald
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