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So – I enabled QoS on my file systems using the defaults in 4.2 Running a restripe with a class of “maintenance” gives me this for mmlsqos output:</div>
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<div><font face="Helvetica,sans-serif">[</font><font face="Courier">root@gpfs-vmd01a ~]# mmlsqos VMdata01 --sum-nodes yes</font></div>
<div><font face="Courier">QOS config::<span class="Apple-tab-span" style="white-space:pre">
</span>enabled</font></div>
<div><font face="Courier">QOS values::<span class="Apple-tab-span" style="white-space:pre">
</span>pool=system,other=inf,maintenance=inf</font></div>
<div><font face="Courier">QOS status::<span class="Apple-tab-span" style="white-space:pre">
</span>throttling active, monitoring active</font></div>
<div><font face="Courier">=== for pool system</font></div>
<div><font face="Courier">10:36:30 other iops=9754 ioql=12.17 qsdl=0.00022791 et=5</font></div>
<div><font face="Courier">10:36:30 maint iops=55 ioql=0.067331 qsdl=2.7e-05 et=5</font></div>
<div><font face="Courier">10:36:35 other iops=7999.8 ioql=12.613 qsdl=0.00013951 et=5</font></div>
<div><font face="Courier">10:36:35 maint iops=52 ioql=0.10034 qsdl=2.48e-05 et=5</font></div>
<div><font face="Courier">10:36:40 other iops=8890.8 ioql=12.117 qsdl=0.00016095 et=5</font></div>
<div><font face="Courier">10:36:40 maint iops=71.2 ioql=0.13904 qsdl=3.56e-05 et=5</font></div>
<div><font face="Courier">10:36:45 other iops=8303.8 ioql=11.17 qsdl=0.00011438 et=5</font></div>
<div><font face="Courier">10:36:45 maint iops=52.8 ioql=0.08261 qsdl=3.06e-05 et=5</font></div>
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<div><font face="Helvetica">It looks like the “maintenance” class is getting perhaps 5% of the overall IOP rate? What do “ioql” and “qsdl” indicate? </font></div>
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<font face="Helvetica">Bob Oesterlin<br>
Sr Storage Engineer, Nuance HPC Grid<br>
507-269-0413</font></div>
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