SyncMirror snapshots not rotating properly on MetroCluster

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Visibility:: Public

Votes:: 0

Category:: ontap-9

Specialty:: metrocluster

Last Updated:

Applies to

NetApp ONTAP 9.8P18
NetApp MetroCluster

Issue

AutoSupport warning: SYNCMIRRORSNAPSHOTSNOTROTATINGPROPERLY
Repeated EMS log messages

Sun Sep 06 08:56:08 +0700 [NODE:snap_helper:wafl.snap.autoDelete:info]: Deleting Snapshot copy 'mirror_resync.<timestamp>(NODE)' in aggregate 'AGGREGATE_NAME' to free up space.

..

Sun Sep 06 18:28:58 +0700 [NODE:config_async_0:raid.mirror.resync.snapcrtfail:error]: Aggregate AGGREGATE_NAME: could not create mirror resynchronization Snapshot copy mirror_resync.<timestamp>(NODE) (No space left on device)

..

Sun Sep 06 18:41:10 +0700 [NODE:config_async_0:callhome.sync.mirror.nospc:alert]: Call home for SYNCMIRROR SNAPSHOTS NOT ROTATING PROPERLY

The data aggregate shows that the .snapshot reserve is at 100% utilization.

Aggregate kbytes used avail capacity

AGGREGATE_NAME 129017709784 101207583928 27810125856 78%.

AGGREGATE_NAME/.snapshot 6790405776 6790405776 0 100%.

ROOT_AGGREGATE 1500205932 1079815892 420390040 72%

ROOT_AGGREGATE/.snapshot 78958204 20 78958184 0%.

While the aggregate space usage report shows approximately 5% Snapshot Reserve usage:

Aggregate : data_ssfile101a
Performance Tier
      Feature                                           Used      Used%
      --------------------------------      ----------------      -----
      Volume Footprints                               94.1TB        74%
      Aggregate Metadata                               140GB         0%
      Snapshot Reserve                                6.32TB         5%
      Total Used                                       100TB        80%
      Total Physical Used                              121TB        96%