How to promote deprioritized constituent of a flex group

Applies to

• ONTAP 9
• AFF 

Description

• When a constituent of flex group is deprioritized and while promoting the flex group to re-participate in the volume-level background deduplication, it throws the below error:

AFF-01::*> volume efficiency promote -vserver <vserver name> -volume <flex group name>
Error: command failed: FlexGroup volume "<vol name>" in Vserver "<vserver name>" is not supported for promotion. Retry the command on constituent(s) of the FlexGroup, if required.

• A volume or constituent of a flex group gets deprioritized while having the efficiency policy with auto and if it does not meet the below requirements,

1.  If volumes are not showing at least 15% savings even after scanning more than 20% of the volume nominal size.
2.  Has frequent overwrites.

• Below is the command to check state of the constituent,

AFF-01::> volume efficiency show -vserver <vserver name > -path /vol/<constituent>

Path:                               /vol/<constituent>
State:                              Enabled
Auto state:                         Deprioritized
Compression:                        Disabled
Inline Compression:                 Disabled
Incompressible Data Detection:      Disabled

• The deprioritized volumes or constituents will no longer participate in the auto policy. Change logging on deprioritized volumes is disabled, and metadata on these volumes is truncated.