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Cold data can't be moved to capacity tier even tiering scanner looks like running

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ontap-9
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Applies to

  • ONTAP 9
  • FabricPool
  • Impacted tiering policies: 'Auto', 'Snapshot-Only', 'All'

Issue

  • By default, tiering scanner runs every 24 hours.
  • Tiering scanner runs and completes every day but it does not tier all the cold data.
  • Once reboot the node, tiering scanner runs again and data movement happens, but the symptom will be probably encountered the next day.
  • For the normal (without node reboot) scanner runs for seconds whereas after reboot the scanner takes hours to complete and data movement happening.

Example:

EMS log to show the normal (without node reboot) scanner runs for seconds and then abort.

Feb 12 13:19:59 JST [node name: scan_ca_tiering_wkr: wafl.scan.start:debug]: Starting composite aggregate tiering on volume volume-name@vserver:xxxx.
Feb 12 13:20:57 JST [node name: wafl_scan_exempt: wafl.scan.done:notice]: Completed composite aggregate tiering on volume volume-name@vserver:xxxx.

EMS log to show after reboot the scanner takes hours to complete.

Feb 10 12:52:05 JST [node name: scan_ca_tiering_wkr: wafl.scan.start:debug]: Starting composite aggregate tiering on volume volume-name@vserver:xxxx.
Feb 10 14:03:29 JST [node name: wafl_scan_exempt: wafl.scan.done:notice]: Completed composite aggregate tiering on volume volume-name@vserver:xxxx.

 

 

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