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High performance impact due to Motherboard issues on AFF-A300

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Category:
ontap-9
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hw
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Applies to

  • ONTAP 9
  • AFF-A300

Issue

  • 100% CPU utilization after replacing the motherboard on the impaired node.
  • All the volumes from the same node report high latency from DATA sub-system

cluster::*> qos statistics volume latency show -vserver <vserver-name> -volume testvolume01_cluster1
Workload            ID    Latency    Network    Cluster       Data       Disk    QoS Max    QoS Min 
--------------- ------ ---------- ---------- ---------- ---------- ---------- ---------- ---------- 
-total-              -     9.35ms   750.00us        0ms     7.50ms  1083.00us        0ms        0ms 
testvolume01_..   6564    56.11ms     4.04ms        0ms    51.59ms   482.00us        0ms        0ms 
-total-              -     7.68ms   918.00us        0ms     5.75ms  1005.00us        0ms        0ms 
testvolume01_..   6564    50.03ms     6.07ms        0ms    43.55ms   411.00us        0ms        0ms 
-total-              -     7.93ms   560.00us        0ms     6.75ms   616.00us        0ms        0ms 
testvolume01_..   6564    56.79ms     2.67ms        0ms    53.75ms   370.00us        0ms        0ms 
-total-              -     9.73ms   867.00us        0ms     7.68ms  1174.00us        0ms        0ms 
testvolume01_..   6564    54.80ms     5.03ms        0ms    49.49ms   284.00us        0ms        0ms 
-total-              -    10.19ms   569.00us        0ms     7.95ms     1.67ms        0ms        0ms 

  • CPU utilization on the node reports  >90 to 100% utilization on all CPU cores even without any major workload : 

cluster::> node run -node <node-name> -command sysstat -m -c 30 -s 1
 ANY  AVG  CPU0 CPU1 CPU2 CPU3 CPU4 CPU5 CPU6 CPU7 CPU8 CPU9 CPU10 CPU11 CPU12 CPU13 CPU14 CPU15
100%  95%   96%  95%  96%  96%  95%  95%  96%  95%  95%  95%   95%   95%   95%   95%   96%   95%
100%  98%   97%  98%  98%  97%  98%  97%  98%  97%  98%  98%   97%   98%   98%   97%   98%   98%
100%  89%   91%  88%  90%  88%  89%  89%  88%  88%  90%  88%   89%   88%   87%   89%   92%   86%
100%  99%   99%  99%  99%  99%  99%  99%  99%  99%  99%  99%   99%   99%   99%   99%   99%   99%
100%  96%   96%  95%  95%  96%  95%  95%  95%  95%  95%  96%   96%   95%   96%   96%   96%   95%
100%  97%   96%  97%  96%  97%  95%  98%  97%  96%  96%  96%   97%   97%   96%   96%   97%   98%

cluster::> node run -node <node-name> -command sysstat -x 1
 CPU    NFS   CIFS   HTTP   Total     Net   kB/s    Disk   kB/s    Tape   kB/s   Cache  Cache    CP
                                       in    out    read  write    read  write     age    hit  time
 84%   4455      0      0    4724    1800 101604   89417      24       0      0    43s    89%  100%
 86%   3805      0      0    3933    1942 101654  103804   67209       0      0    50s    93%  100%
 90%   2937      0      0    3028    1534  82590   95313   15497       0      0    45s    94%  100%
 93%   3361      0      0    3470    1464  83808   72377      36       0      0    48s    92%   11%
 93%   3596      0      0    3734    2643  84973   65356    4977       0      0    47s    91%   42%
 91%   3462      0      0    3571    1246  74254   59665      24       0      0    47s    91%    0%
 91%   3912      0      0    4031    2062  75502   65672      24       0      0    48s    90%   38%
 91%   3844      0      0    3950    4401 138075   82362    3455       0      0    48s    93%   26%
 94%   3742      0      0    3851    1097  60757   78074      36       0      0    49s    91%    0%
 94%   3616      0      0    3746    1342 137586   88379       0       0      0    51s    93%    0%
 93%   3662      0      0    3828    2253  59392   96558      24       0      0    52s    96%    0%
 95%   3624      0      0    3857    1247  58682   93645       0       0      0    50s    97%    0%

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