topic Snapvault & Dedup in ONTAP Discussions

Snapvault & Dedup

axsys — Wed, 04 Jun 2025 23:44:04 GMT

Hey Guys,

filer01 = HA FAS3250 7-Mode 8.2.2P2

filer01-dr = Single FAS3250 7-Mode 8.2.3

I've got a volume on my Primary which I've deduped:

fller01> df -Vg voloffice
Filesystem               total       used      avail capacity Mounted on
/vol/voloffice/         3705GB     3532GB      173GB      95% /vol/voloffice/
/vol/voloffice/.snapshot      114GB      154GB        0GB     134% /vol/voloffi
ce/.snapshot

filer01> sis status /vol/voloffice
Path State Status Progress
/vol/voloffice Enabled Idle Idle for 16:08:30

filer01> df -s -g voloffice
Filesystem used saved %saved
/vol/voloffice/ 3532GB 1992GB 36%

but when I look into the vaulted volume on my secondary, I see this:

filer01-dr> df -Vg sv_voloffice
Filesystem               total       used      avail capacity Mounted on
/vol/sv_voloffice/      5332GB     5247GB       84GB      98% /vol/sv_voloffice/
/vol/sv_voloffice/.snapshot      868GB      706GB      161GB      81% /vol/sv_voloffice/.snapshot

filer01-dr> sis status
Path State Status Progress
/vol/sv_voloffice Enabled Idle Idle for 12:28:41

filer01-dr> df -s -g sv_voloffice
Filesystem used saved %saved
/vol/sv_voloffice/ 5247GB 235GB 4%

filer01-dr> sis config /vol/sv_voloffice
                                              Inline      Incompressible Compression Quick
Path                 Schedule     Compression Compression Data Detection Check File Size
-------------------- ------------ ----------- ----------- -------------- -----------------
/vol/sv_voloffice    -            Disabled    Disabled    Disabled       524288000

reading this: http://community.netapp.com/t5/Data-ONTAP-Discussions/Deduplication-on-secondary-vol/td-p/10336

and this: https://library.netapp.com/ecmdocs/ECMP1196986/html/GUID-E5AD37DE-2F44-47DB-90A3-C8E115FCBFB7.html

I don't really understand the result I'm having on my secondary. Anyone care to help me out here please?

Thanks,

axsys

Re: Snapvault & Dedup

aborzenkov — Mon, 20 Jul 2015 15:17:39 GMT

Did you enable de duplication on SV secondary from the very beginning? Did you run sis start -s on secondary?

Re: Snapvault & Dedup

axsys — Mon, 20 Jul 2015 15:52:22 GMT

hmm.. I might just be stupid... I remember trying this in the past and it didn't work telling me sis can't be started on a sv secondary. I just started it now without any messages and will report back.

Thanks for the tip 🙂

What I'm curious about tho is why SV is transferring all the data instead of just the deduped data, if anyone care to shed some light on this case for me that would be great too, to understand!

Thanks,

axsys

Re: Snapvault & Dedup

richard_payne — Mon, 20 Jul 2015 17:13:14 GMT

"What I'm curious about tho is why SV is transferring all the data instead of just the deduped data"

because snapvault is qtree based and any qtree based transfers (snapvault and snapmirror) re-hydrate the data for transfer (vs Volume SnapMirror which transfers the data compressed).

Hope that helps.

--rdp

Re: Snapvault & Dedup

axsys — Tue, 21 Jul 2015 07:49:22 GMT

I see thanks for the reply richard.