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Latency observed when a FlexGroup constituent goes full

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ontap-9
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Applies to

  • ONTAP 9
  • FlexGroup volumes

Issue

  • High latency is observed on a FlexGroup but the overall system latency is not very high.
  • All of the FlexGroup constituents are more than 95% utilized and one constituent is full:
Vserver   Volume         Aggregate    State      Type  Size      Available Used%
--------- ------------   ------------ ---------- ---- ---------- ---------- -----
SVM-1    FlexGroup__0001  aggr_01     online     RW    100TB      1.95TB     98%
SVM-1    FlexGroup__0002  aggr_02     online     RW    100TB      1.94TB     98%
SVM-1    FlexGroup__0003  aggr_01     online     RW    100TB      1.95TB     98%
SVM-1    FlexGroup__0004  aggr_02     online     RW    100TB      1.95TB     98%
SVM-1    FlexGroup__0005  aggr_01     online     RW    100TB      0B         100%
SVM-1    FlexGroup__0006  aggr_02     online     RW    100TB      1.94TB     98%
SVM-1    FlexGroup__0007  aggr_01     online     RW    100TB      1.94TB     98%
SVM-1    FlexGroup__0008  aggr_02     online     RW    100TB      1.94TB     98%
  • There is no option to increase the size of the constituents, as they are already at their maximum limit (100TB).
  • Adding new constituents to the FlexGroup does not reduce the utilization of the full constituent.

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