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Single misbehaving disk type X377_SEVNE10TA07 NA02 cause latency

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Applies to

  • Disk type X377_SEVNE10TA07 NA02
  • ONTAP 9

Issue

  • Long Consistency Point (CP) error reported in ONTAP Event Message System EMS. Example:

wafl.cp.toolong:error]: Aggregate data01 experienced a long CP

  • In statit one disk show higher utilization than others in the same RAID group. Example:

 disk    ut%  xfers  ureads--chain-usecs writes--chain-usecs cpreads-chain-usecs greads--chain-usecs gwrites-chain-usecs
/data01/plex0/rg0:
0a.00.13 18  95.47    0.50   1.00   507  40.29  63.72   150  54.68  39.07   170   0.00   ....     .   0.00   ....     .
0a.00.14 99  96.67    0.53   1.00 32655  41.82  62.45  1530  54.32  38.76  1774   0.00   ....     .   0.00   ....     . 
0a.00.15 49 100.77   35.52   7.05  2774  39.29  54.27   350  25.96  17.19   884   0.00   ....     .   0.00   ....     .
0a.00.16 51 103.40   39.25   6.78  3068  39.09  54.95   380  25.06  16.75  1000   0.00   ....     .   0.00   .... 

(More information at How to Assess Disk Response Times in ONTAP)

 

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