[gpfsug-discuss] Interpreting "mmlsqos" output

[Oesterlin, Robert]

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:

[root at gpfs-vmd01a ~]# mmlsqos VMdata01 --sum-nodes yes
QOS config:: enabled
QOS values:: pool=system,other=inf,maintenance=inf
QOS status:: throttling active, monitoring active
=== for pool system
10:36:30 other iops=9754 ioql=12.17 qsdl=0.00022791 et=5
10:36:30 maint iops=55 ioql=0.067331 qsdl=2.7e-05 et=5
10:36:35 other iops=7999.8 ioql=12.613 qsdl=0.00013951 et=5
10:36:35 maint iops=52 ioql=0.10034 qsdl=2.48e-05 et=5
10:36:40 other iops=8890.8 ioql=12.117 qsdl=0.00016095 et=5
10:36:40 maint iops=71.2 ioql=0.13904 qsdl=3.56e-05 et=5
10:36:45 other iops=8303.8 ioql=11.17 qsdl=0.00011438 et=5
10:36:45 maint iops=52.8 ioql=0.08261 qsdl=3.06e-05 et=5

It looks like the “maintenance”  class is getting perhaps 5% of the overall IOP rate? What do “ioql” and “qsdl” indicate?

Bob Oesterlin
Sr Storage Engineer, Nuance HPC Grid
507-269-0413

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