Snapvault & Dedup

[axsys]

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

[aborzenkov]

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

[axsys]

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

[richard_payne]

"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

[axsys]

I see thanks for the reply richard.