Hi Diane, Can you help Simon with the below query. Or else would you know who would be the best person to be contacted here.
Regards, The Spectrum Scale (GPFS) team ------------------------------------------------------------------------------------------------------------------ If you feel that your question can benefit other users of Spectrum Scale (GPFS), then please post it to the public IBM developerWroks Forum at https://www.ibm.com/developerworks/community/forums/html/forum?id=11111111-0000-0000-0000-000000000479. If your query concerns a potential software error in Spectrum Scale (GPFS) and you have an IBM software maintenance contract please contact 1-800-237-5511 in the United States or your local IBM Service Center in other countries. The forum is informally monitored as time permits and should not be used for priority messages to the Spectrum Scale (GPFS) team. From: Simon Thompson <[email protected]> To: "[email protected]" <[email protected]> Date: 04-01-2021 05.51 PM Subject: [EXTERNAL] [gpfsug-discuss] Spectrum Protect and disk pools Sent by: [email protected] Hi All, We use Spectrum Protect (TSM) to backup our Scale filesystems. We have the backup setup to use multiple nodes with the PROXY node function turned on (and to some extent also use multiple target servers). This all feels like it is nice and parallel, on the TSM servers, we have disk pools for any “small” files to drop into (I think we set anything smaller than 20GB) to prevent lots of small files stalling tape drive writes. Whilst digging into why we have slow backups at times, we found that the disk pool empties with a single thread (one drive). And looking at the docs: https://www.ibm.com/support/pages/concurrent-migration-processes-and-constraints This implies that we are limited to the number of client nodes stored in the pool. i.e. because we have one node and PROXY nodes, we are essentially limited to a single thread streaming out of the disk pool when full. Have we understood this correctly as if so, this appears to make the whole purpose of PROXY nodes sort of pointless if you have lots of small files. Or is there some other setting we should be looking at to increase the number of threads when the disk pool is emptying? (The disk pool itself has Migration Processes: 6) Thanks Simon_______________________________________________ gpfsug-discuss mailing list gpfsug-discuss at spectrumscale.org http://gpfsug.org/mailman/listinfo/gpfsug-discuss
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