Content preview: Indeed, that's a good sanity check. I just checked and both
of our LTO7 pools are below their MAXSCRATCH setting, and we have scratch
tapes available in that library. I'm also not seeing any messages in the
activity or mount logs indicating a failure to mount scratch tapes. [...]
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Indeed, that's a good sanity check. I just checked and both of our LTO7
pools are below their MAXSCRATCH setting, and we have scratch tapes
available in that library. I'm also not seeing any messages in the activity
or mount logs indicating a failure to mount scratch tapes.
Interestingly, the percent utilized for these two volumes was at 40% which,
with a device class format of ULTRIUM7C, would be right at the expected
point where a volume with uncompressible data should be full. I wonder if
there's some logic failure within TSM where it assumes >0% compression for
the last file.
In any event, TSM finally marked these two volumes as full after a few
hundred attempts. I would be sort of curious to know what the last file was
on each of them...
On Tue, Jan 09, 2018 at 02:21:50PM +0000, Schofield, Neil (Contractor - Storage
& Middleware, Backup & Restore) wrote:
> Skylar
>
> It's probably worth ruling out the obvious stuff first.
>
> If the end-of-volume is reached then a new scratch tape will be required. If
> for some reason a new scratch tape cannot be mounted (eg there are no scratch
> left) to complete the writing of the spanned file/object then the store
> operation will fail and the previous end-of-data point on the tape will be
> used as the starting point the next time the tape is mounted. I've seen many
> occasions where a paucity of scratch tapes has resulted in the end-of-tape
> being reached repeatedly on the handful of remaining 'filling' volumes.
>
> In the cases where the end-of-volume has been reached, has a scratch volume
> been successfully mounted subsequently to complete the operation?
>
> Regards
> Neil
>
>
> Neil Schofield
> IBM Spectrum Protect SME
> Backup & Recovery | Storage & Middleware | Platform Technologies |
> Infrastructure Technology Services | Group CIO & IT Change
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--
-- Skylar Thompson (skyl...@u.washington.edu)
-- Genome Sciences Department, System Administrator
-- Foege Building S046, (206)-685-7354
-- University of Washington School of Medicine
