topic Re: Increasing deduplicated volume size after the threshold limit in ONTAP Discussions

Increasing deduplicated volume size after the threshold limit

chal_arun — Thu, 05 Jun 2025 06:59:33 GMT

Hi we have the following storage model and I have checked the threshold limit for the model FAS2050 for a deduplicated volume is 2TB.

I want to increase the space of the volume beyond the threshold limit.

storage model
FAS2050 : with ontap 7.3.3

message while adding more space to the volume

vol size: Selected SIS volume size is too large; maximum is 2048g

df -s output of the volume
Filesystem used saved %saved
/vol/vol1/ 2094239660 0 0%

Re: Increasing deduplicated volume size after the threshold limit

lovik_netapp — Fri, 25 Feb 2011 12:22:50 GMT

If you want to increase a volume size beyond the dedupe limit then you have to first disable the dedupe then try increasing it

Re: Increasing deduplicated volume size after the threshold limit

Darkstar — Fri, 25 Feb 2011 13:19:57 GMT

0% savings seems a bit low for any kind of volume. Did you run SIS on the volume at all? "sis start -s /vol/<volumename>" ?

As soon as you get more free space by deduplication, you can increase the volume size again. The number of physically allocated blocks cannot exceed 2TB. So if you save, say, 50g by deduplication you can increase the size of the volume by 50g afterwards

-Michael

Re: Increasing deduplicated volume size after the threshold limit

chal_arun — Thu, 24 Mar 2011 06:10:25 GMT

Hi ,

Since the space saving was almost nill , we disabled the de-dupe volume using "sis undo"

then we increased the space for the volume.

Re: Increasing deduplicated volume size after the threshold limit

DNOINTERNATIONAL — Mon, 12 Sep 2011 08:25:55 GMT

Hi,

I have the same issue, need to increase a dedupe volume over the limit.

/vol/vol1/ 1066374992 201679956 16%

Can I stop sis when the volume is 99% full, then increase the volume?

Can anyone update me on the procedure for this action?

-Pål-André

Increasing deduplicated volume size after the threshold limit

peter_lehmann — Tue, 13 Sep 2011 07:35:20 GMT

You can stop SIS anytime on the volume.

Then increase the size and run the "sis undo" command to make it a "normal" volume again.

Peter

PS "sis undo" is an "advanced" command (priv set advanced)

Re: Increasing deduplicated volume size after the threshold limit

DNOINTERNATIONAL — Tue, 13 Sep 2011 11:18:19 GMT

vol size gives me this error:

vol size: Selected SIS volume size is too large; maximum is 1024g.

Even after I disabeled sis the error appears. So can I do a "sis undo" before sizing the volume? Or will that trash data?

-Pål-André

Increasing deduplicated volume size after the threshold limit

peter_lehmann — Tue, 13 Sep 2011 11:28:08 GMT

Yes, just sis undo and then grow the vol. WAFL N-E-V-E-R thrashes any data... I think

Peter

Increasing deduplicated volume size after the threshold limit

Darkstar — Tue, 13 Sep 2011 11:30:04 GMT

Well, it *thrashes* data from time to time, but it NEVER *trashes* data 😉

-Michael

Increasing deduplicated volume size after the threshold limit

peter_lehmann — Tue, 13 Sep 2011 12:33:10 GMT

OK OK... English 4 Beginners... I got it

If we meet, I can thrash you and then throw you in the trash, correct?

Peter

Increasing deduplicated volume size after the threshold limit

DNOINTERNATIONAL — Tue, 13 Sep 2011 12:48:14 GMT

Forget about the comments Peter, you got my point

The 16% (200GB) of dedupe data on the volume, that was what worried me since we're going to do a sis undo.

-Pål-André

Re: Increasing deduplicated volume size after the threshold limit

kuljinder — Tue, 04 Nov 2014 19:17:36 GMT

What if "sis undo" errors out that you don't have enough space to convert the volume to normal.