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FlexGroup rebalance is skipping large amount of blocks due to efficiency

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ontap-9
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core
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Applies to

  • ONTAP 9.16.1P3
  • FlexGroup volume

Issue

  • After initiating a vol rebalance operation, only a single large file was moved over several days, despite the rebalance process being active.

::*> vol rebalance start -volume volume -max-runtime 720h -max-file-moves 50 -min-file-size 20MB -exclude-snapshots false
::*> vol rebalance file-move-statistics show -vserver svm1 -volume volume
Vserver: svm1
Volume: volume
Source           Destination
Constituent      Files    Bytes     Files    Bytes
---------------------------------------------------------------
volume__0001
  InProgress:    0        0B        0        0B
  Completed:     1        284.2GB   0        0B

  • The Volume-rebalance.xml in ASUP shows:

Blocks Skipped Due To Large Files = 0

High values for

Blocks Skipped Due To Efficiency(by Percent)

Blocks Skipped Due To Efficiency(by Block Count)

  • Manual file moves are possible but not scalable for large environments.

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