<html><body><p><font size="2">Hi Diane,</font><br><br><font size="2">Can you help Simon with the below query. Or else would you know who would be the best person to be contacted here.</font><br><br><br><font size="2">Regards, The Spectrum Scale (GPFS) team<br><br>------------------------------------------------------------------------------------------------------------------<br>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 <a href="https://www.ibm.com/developerworks/community/forums/html/forum?id=11111111-0000-0000-0000-000000000479">https://www.ibm.com/developerworks/community/forums/html/forum?id=11111111-0000-0000-0000-000000000479</a>. <br><br>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. <br><br>The forum is informally monitored as time permits and should not be used for priority messages to the Spectrum Scale (GPFS) team.</font><br><br><img width="16" height="16" src="cid:1__=0ABB0CC0DFD91C6B8f9e8a93df938690918c0AB@" border="0" alt="Inactive hide details for Simon Thompson ---04-01-2021 05.51.18 PM---Hi All, We use Spectrum Protect (TSM) to backup our Scale "><font size="2" color="#424282">Simon Thompson ---04-01-2021 05.51.18 PM---Hi All, We use Spectrum Protect (TSM) to backup our Scale filesystems. We have the backup setup to u</font><br><br><font size="2" color="#5F5F5F">From: </font><font size="2">Simon Thompson <S.J.Thompson@bham.ac.uk></font><br><font size="2" color="#5F5F5F">To: </font><font size="2">"gpfsug-discuss@spectrumscale.org" <gpfsug-discuss@spectrumscale.org></font><br><font size="2" color="#5F5F5F">Date: </font><font size="2">04-01-2021 05.51 PM</font><br><font size="2" color="#5F5F5F">Subject: </font><font size="2">[EXTERNAL] [gpfsug-discuss] Spectrum Protect and disk pools</font><br><font size="2" color="#5F5F5F">Sent by: </font><font size="2">gpfsug-discuss-bounces@spectrumscale.org</font><br><hr width="100%" size="2" align="left" noshade style="color:#8091A5; "><br><br><br><font face="Calibri">Hi All,</font><br><font face="Calibri"> </font><br><font face="Calibri">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).</font><br><font face="Calibri"> </font><br><font face="Calibri">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.</font><br><font face="Calibri"> </font><br><font face="Calibri">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:</font><br><a href="https://www.ibm.com/support/pages/concurrent-migration-processes-and-constraints"><u><font color="#0563C1" face="Calibri">https://www.ibm.com/support/pages/concurrent-migration-processes-and-constraints</font></u></a><br><font face="Calibri"> </font><br><font face="Calibri">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.</font><br><font face="Calibri"> </font><br><font face="Calibri">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)</font><br><font face="Calibri"> </font><br><font face="Calibri">Thanks</font><br><font face="Calibri"> </font><br><font face="Calibri">Simon</font><tt><font size="2">_______________________________________________<br>gpfsug-discuss mailing list<br>gpfsug-discuss at spectrumscale.org<br></font></tt><tt><font size="2"><a href="http://gpfsug.org/mailman/listinfo/gpfsug-discuss">http://gpfsug.org/mailman/listinfo/gpfsug-discuss</a></font></tt><tt><font size="2"> <br></font></tt><br><br><BR>
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