topic Can you tell if dedup has run on the entire volume? in Active IQ Unified Manager Discussions

Can you tell if dedup has run on the entire volume?

J_ABELLA — Thu, 05 Jun 2025 06:20:01 GMT

Is there a command or technique to indicate if dedup has traversed the entire volume?

We have a number of volumes that had sis enabled after it contained data and has only been run on data that was added after. It would be nice to know if a volume hasn't had deduplication run against all the blocks. I would like to ultimately produce a report using dfm as the where we might be able to save additional space, approximately 1000 volumes.

Thanks
James

Re: Can you tell if dedup has run on the entire volume?

AGUMADAVALLI — Wed, 29 Aug 2012 18:28:09 GMT

Put a script together with all volumes with the following commands

Once it’s running, you can check the status with:

sis status /vol/<volname>

After it’s finished running, you can see your space savings like this:

df -s /vol/<volname>

Run the script using the dfm at regular intervals and allow it send a email.

thank you,

AK G

Re: Can you tell if dedup has run on the entire volume?

J_ABELLA — Wed, 29 Aug 2012 18:43:28 GMT

Thanks Agumadavalli, SIS is and has been running for a few months in some instances but when some admins enabled they didn't run it against the entire volume to my understanding it only runs against new/changed data in the volume and not against every block until the scan entire volume is selected (aka sis start -s). Unless I am missing something df -S only indicates what the compresssion savings are, I can't tell if it has run against every block in the volume.

James

Re: Can you tell if dedup has run on the entire volume?

AGUMADAVALLI — Wed, 29 Aug 2012 18:47:45 GMT

"sis status -l" will show when the last run and status of each volume, try this.

thank you,

AK G

Re: Can you tell if dedup has run on the entire volume?

THIFM — Wed, 29 Aug 2012 20:09:37 GMT

As far as I know, it's not possible or it's not an easy info to collect. Please correct me if I'm wrong.

Re: Can you tell if dedup has run on the entire volume?

J_ABELLA — Fri, 07 Sep 2012 16:19:31 GMT

Thanks Thiago, this has pretty much been my conclusion as well but I would think something should be available or a technique to have a good indication. At this point I just flip through the enabled volumes and if they aren't getting at least 10% I use the Oncommand system manager and tell it to scan the entire volume. I can only do this for about 4-5 volumes max at a time.

Thanks, James