On Sat, 3 Nov 2007 10:12:43 -0400, Stan Horwitz <stan AT TEMPLE DOT EDU> 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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>=========================================================================
I know this is a laaaaate reply, but I noticed you are active on the list.
We are also using the X4500/ZFS combo for AFTDs and are seeing the same
problem where devices are randomly unmounted. The X4500s were a pain for a
while with all the marvell driver issues. We also implement automatic
staging. Do you only see this problem when using staging policies? We're
running 7.4.2 (Solaris).
-merill
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