High CPU utilization when IOPS are lower than expected

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Views:: 762

Visibility:: Public

Votes:: 0

Category:: ontap-9

Specialty:: perf

Last Updated:

Applies to

ONTAP 9

Issue

CPU utilization is high but IOPS are not on higher side.
System is servicing less number of IOPS than expected.

nodeshell> sysstat -x 1

CPU    NFS   CIFS   Total     Net   kB/s     SSD    kB/s   Cache   CP             CP_Ty               CP_Ph        HDD   SSD     FCP  iSCSI     FCP   kB/s   iSCSI   kB/s  
                                in    out    read   write    hit   time  [T--H--F--N--B--O--#--:]  [n--v--p--f]    util  util                    in    out      in    out  
87%      0      0   18865   27005 1437837  766806      36    59%     0%   0--0--0--0--0--0--0--0    0--0--0--0       0%   10%      0  18865       0      0   14153 1401718
91%      0      0   20361   54662 1411932  704124      12    59%     0%   0--0--0--0--0--0--0--0    0--0--0--0       0%   11%      0  20349       0      0   84279 1323838
86%      0      0   19373   67099 1362633  636356      36    56%     0%   0--0--0--0--0--0--0--0    0--0--0--0       0%   10%      0  19352       0      0   34314 1297262
83%      0      0   19373   45697 1341457  629160       0    58%     0%   0--0--0--0--0--0--0--0    0--0--0--0       0%    8%      0  19373       0      0   49332 1242115
87%      0      0   24721   41867  875967  592351       0    57%     0%   0--0--0--0--0--0--0--0    0--0--0--0       0%   11%      0  24721       0      0   64270 1178077
98%      0      0   34218  166166 1568906  606936      36    62%     0%   0--0--0--0--0--0--0--0    0--0--0--0       0%   20%      0  34215       0      0  142193 1089826
97%      0      0   22118   76337  668708  718314   62665    57%    99%   0--0--0--0--0--1--0--0    0--1--0--0       0%   19%      0  22118       0      0   61469 1141812