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FAQ: File System Analytics considerations

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Applies to

  • ONTAP 9.8 and later
  • File System Analytics (FSA)

Answer

Enable/disable FSA:
  • FSA can be enabled/disabled immediately via the following commands/System manager.
  • However, if performance impact is appeared, it will take some time to recover after disabling (perhaps an hour or more).
FSA system overhead consideration:
  • When you enable capacity analytics, ONTAP conducts an initialization scan for capacity analytics. The scan accesses metadata for all files in volumes for which capacity analytics is enabled. 
  • ONTAP automatically attempts to create the internal FSA database(analytics meta file) on all supported volumes. Therefore, ensure that at least 5 to 8 percent of the volume's available space is free before enabling File System Analytics on a volume.
  • Beginning with ONTAP 9.15.1, ONTAP presents an error message if there's not enough space available when you enable File System Analytics on a volume.

[node1: wafl.analytics.init.fail:ALERT]: Failed to initialize a file system analytics database for volume @vserver:08c57dac-1afb-11e9-a82f-xxxxxxxxxx:vol1, No space left on device.

Notes: If the volume has autosize enabled, calculate the available size based on the maximum autogrow size.

Additional Information

See Scan considerations

 

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