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Re: [Networker] Advanced file system device during a network outage
2007-11-03 11:49:54
Stan,
I'm running 7.3.3 and I see the AFTD mounts get unmounted once in a
while. I've never figured out why it happens. I've never reported it
to EMC either (I've got enough issues open with them). I just regularly
check the devices list in NMC and if any of the AFTD's are unmounted (or
their RO side -- which is the more common problem), I remount them. If
I forget to check, I usually get alerted when I see a request to mount a
volume on the device.
I think it is safe to assume that the network outage was a
contributing factor to the AFTD getting unmounted, but it might have
been a coincidence.
Are you using scripted or NW Automatic staging? Automatic staging
doesn't unmount the volume from the device.
Frank
Stan Horwitz wrote:
I am very new to staging and the use of advanced file system devices
with NetWorker 7.4 on a Sun T2000 server. On Tuesday, an outside
consultant set up on a new storage node with NetWorker 7.4 on a Sun
X4500. It was working well until last night. We are staging to an
ADVFS device on the X4500. The device is on a 10TB ZFS volume that's
internal to the X4500. The T2000 and X4500 both share a Sony PetaSite
tape library using dynamic drive sharing for four of its 14 tape
drives. I have seen data stream to the disk device as fast as 93MB/s
so I am thrilled with it, especially since it was handling only six
sessions at the time! Unfortunately, last night around 7:00, we had a
network outage that appears to have lasted for at least half an hour,
but I am not sure because I was out shopping when this outage began.
DNS service was down for both our DNS servers. Of course, lots of
backups that were in progress failed.
I would expect backups to fail for some clients during a network
outage, but what surprised me was that the volume that was labeled for
the disk device was unmounted. It had well under 10TB on it and none
of the savesets on it show an abort. What I don't understand is why
the disk volume became unmounted. This disk volume is set up for
staging where the low water mark is 30% and the high water mark is 70%
and it has yet to reach the 70% because its only been in use since
Tuesday night and I haven't set up all the clients yet that I intend
to use it with.
At any rate, I used nsrmm to mount the disk volume again and it
mounted fine and some non-NDMP backups that were previously sending
data to it resumed sending their data. What also surprised me was that
four NDMP DSA backups that were writing to this disk volume failed
over to tape and they are still in progress. This stunned me because I
didn't realize that was possible. Unfortunately, the NDMP backups did
not fail over from where they left off; they started over again from
scratch.
Does anyone have any idea of why the disk device volume became
unmounted? Is it safe to assume this network outage cause this to
happen or do you think it was just a coincidence?
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--
Frank Swasey | http://www.uvm.edu/~fcs
Sr Systems Administrator | Always remember: You are UNIQUE,
University of Vermont | just like everyone else.
"I am not young enough to know everything." - Oscar Wilde (1854-1900)
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