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ONTAP Discussions

Deduplication and Storage vMotion

bsnyder27

We are in the process of migrating VMs from our current FAS to a new FAS. Current is running OnTap 8.3.2 and new OnTap 9.1 and volumes are mounted NFSv3.

 

After migrating a fair number of VMs and enabling efficiency on the new volume, the effiiciency job completed. Hours later and it's still showing 0% savings for the volume.

 

Is there any way that the deduplication of the VMs could be preserved when performing an svmotion between two separate clusters like this?

1 ACCEPTED SOLUTION

asulliva

Hello @bsnyder27,

 

Unfortunately not without using storage array level replication, like SnapMirror, to move the entire datastore followed by performing a cutover...which is a disruptive operation (the VMs would need to be shutdown, removed from inventory at the old location, then re-added from the new).

 

Did you enable (post-process) deduplication after the data was added to the volume?  If so you'll need to do

 

volume efficiency start -vserver <vserver_name> -volume <volume_name> -scan-all

Hope that helps.

 

Andrew

If this post resolved your issue, please help others by selecting ACCEPT AS SOLUTION or adding a KUDO.

View solution in original post

1 REPLY 1

asulliva

Hello @bsnyder27,

 

Unfortunately not without using storage array level replication, like SnapMirror, to move the entire datastore followed by performing a cutover...which is a disruptive operation (the VMs would need to be shutdown, removed from inventory at the old location, then re-added from the new).

 

Did you enable (post-process) deduplication after the data was added to the volume?  If so you'll need to do

 

volume efficiency start -vserver <vserver_name> -volume <volume_name> -scan-all

Hope that helps.

 

Andrew

If this post resolved your issue, please help others by selecting ACCEPT AS SOLUTION or adding a KUDO.

View solution in original post

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