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How to understand volume's 'is-sis' related configuration?

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Answer

is-sis related parameters will automatically be set to true only for the volume where the volume efficiency setting is enabled.

Examples:
lccls91001::> set diag

Warning: These diagnostic commands are for use by NetApp personnel only.
Do you want to continue? {y|n}: y

lccls91001::*> volume show -fields is-sis-volume,is-sis-logging-enabled,is-sis-state-enabled
vserver    volume                                     is-sis-volume is-sis-logging-enabled is-sis-state-enabled
---------- ------------------------------------------ ------------- ---------------------- --------------------
svm91001   vol1                                       true          true                   true
svm91001   vol1clone                                  true          true                   true
svm91001   vol2                                       false         false                  false
svm91001   vol4                                       false         false                  false

lccls91001::*> volume efficiency show
Vserver    Volume           State     Status      Progress           Policy
---------- ---------------- --------- ----------- ------------------ ----------
svm91001   vol1             Enabled   Idle        Idle for 10:36:16  -
svm91001   vol1clone        Enabled   Idle        Idle for 10:36:16  -
2 entries were displayed.

Notes :     

  • is-sis-volume can be true if the volume has clones OR dedupe enabled OR a snap restore has happened on the volume. 
  • is-sis-logging-enabled is true only if dedupe is enabled on that volume.
    • On deprioritized volumes, is-sis-logging-enabled is false but is-sis-volume and is-sis-state-enabled can still keep true.
    • Users can promote the deprioritized volume to re-participate in an automatic background deduplication using the volume efficiency promote command available at the advanced privilege level.

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