On Fri, Jan 27, 2012 at 03:25:39PM +1100, Ivan Rodriguez wrote:
> We have a backup server with a zpool size of 20 TB, we transfer
> information using zfs snapshots every day (we have around 300 fs on
> that pool),
> the storage is a dell md3000i connected by iscsi, the pool is
> currently version 10, the same storage is connected
>  to another server with a smaller pool of 3 TB(zpool version 10) this
> server is working fine and speed is good between the storage
> and the server, however  in the server with 20 TB pool performance is
> an issue  after we restart the server
> performance is good but with the time lets say a week the performance
> keeps dropping until we have to
> bounce the server again (same behavior with new version of solaris in
> this case performance drops in 2 days), no errors in logs or storage
> or the zpool status -v

This sounds like a ZFS cache problem on the server.  You might check
on how cache statistics change over time.  Some tuning may eliminate
this degradation.  More memory may also help.  Does a scrub show any
errors?  Does the performance drop affect reads or writes or both?

> We suspect that the pool has some issues probably there is corruption
> somewhere, we tested solaris 10 8/11 with zpool 29,
> although we haven't update the pool itself, with the new solaris the
> performance is even worst and every time
> that we restart the server we get stuff like this:
>  SOURCE: zfs-diagnosis, REV: 1.0
>  EVENT-ID: 0168621d-3f61-c1fc-bc73-c50efaa836f4
> DESC: All faults associated with an event id have been addressed.
>  Refer to http://sun.com/msg/FMD-8000-4M for more information.
>  AUTO-RESPONSE: Some system components offlined because of the
> original fault may have been brought back online.
>  IMPACT: Performance degradation of the system due to the original
> fault may have been recovered.
>  REC-ACTION: Use fmdump -v -u <EVENT-ID> to identify the repaired components.
> [ID 377184 daemon.notice] SUNW-MSG-ID: FMD-8000-6U, TYPE: Resolved,
> VER: 1, SEVERITY: Minor
> And we need to export and import the pool in order to be  able to  access it.

This is a separate problem, introduced with an upgrade to the Iscsi
service.  The new one has a dependancy on the name service (typically
DNS), which means that it isn't available when the zpool import is
done during the boot.  Check with Oracle support to see if they have
found a solution.

-Gary Mills-            -refurb-                -Winnipeg, Manitoba, Canada-
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