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Intermittent Snapshots not rotating properly alerts reported

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Category:
metrocluster
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MetroCluster
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Applies to

  • ONTAP 9
  • MetroCluster

Issue

  • Intermittent SYNCMIRROR SNAPSHOTS NOT ROTATING PROPERLY Autosupports triggered
  • Event log showing errors:
Thu Apr 20 12:28:06 +0200 [Node_A1: config_async_0: raid.mirror.resync.snapcrtfail:error]: Aggregate aggr1: could not create mirror resynchronization Snapshot copy mirror_resync.0420102806(aggr1) (No space left on device)
  • Warnings about large number of file deletions:
Wed Jan 18 01:34:50 +0100 [Node_A1: wafl_exempt05: wafl.zombie.susp.aggr.limit:notice]: WAFL(R) aggregate aggr1 is experiencing zombie throttling possibly due to requests for large number of file deletions. This can be mitigated by a combination of a) reducing the load on the aggregate or b) issuing the file deletion requests in smaller batches.
  • df -a -h shows snapshot reserve for the affected aggregate to be full:
ClusterA::> run -node nodeA_1 -c df -A -h
Aggregate                total       used      avail capacity
aggr1                     3179GB     1029GB     2149GB      32%
aggr1/.snapshot           167GB       167GB      NaN      100%

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