topic Re: copy volume (with active mirror relation ship) to another filer in ONTAP Discussions

copy volume (with active mirror relation ship) to another filer

JETADMIN007 — Thu, 05 Jun 2025 06:07:03 GMT

Hi,

I have this situation :

cluster : filer1, filer2 in one site

cluster : filer3, filer4 in another site.

all filers are running ontap 8.0.2.

Wan between sites is 20 MBit.

I have on filer1 : volume1 wich is snapmirrored to filer3:volume1bis every hour of the day, every day. Volumes are luns within qtrees and accessed via ISCSI.

I want to copy filer1:volume1 to filer2:volume2 (=new volume created on filer2) and preserve snapmirror relationship ? (well, yes, i can break the relationship for filer1:volume1 and make a new one filer2:volume2 to snapmirror to filer3:volume1bis.)

The volumes are 300GB big, so if I copy from one filer to another, I have to make sure that my snapmirror doesn't start to rebaseline everything over my small 20Mbit wan line.

What is the best method here? I was thinking of breaking down the snampirror between filer1 and filer3, and then setting up snapmirror between filer1 and filer2 to copy the volume. And at the end, breaking filer1-filer2 snapmirror and setting up snapmirror between filer2 and filer3 and let's hope that only delta's are sent.

Or do i make a cascade from filer1 to filer2 and from filer2 to filer3 (again, let's hope that the delta's can be sent) and at the end break the snapmirror between filer1 and filer2?

Re: copy volume (with active mirror relation ship) to another filer

aborzenkov — Wed, 20 Mar 2013 13:37:07 GMT

Are you using QSM or VSM?

Re: copy volume (with active mirror relation ship) to another filer

JETADMIN007 — Wed, 20 Mar 2013 13:50:30 GMT

volume snap mirror.

Re: copy volume (with active mirror relation ship) to another filer

aborzenkov — Wed, 20 Mar 2013 13:52:43 GMT

Then

- Setup snapmirror between filer1 and filer2 (do not break other relationship yet); wait until it is synchronized

- Break filer1 => filer3 and filer1 => filer2

- Resync filer2 => filer3

Re: copy volume (with active mirror relation ship) to another filer

JETADMIN007 — Wed, 20 Mar 2013 14:07:24 GMT

Hi, thanks for your reply. Is it possible to set up snapmirror to 2 destinations at the same time?

I thought it was not, but I'm not the expert.

I will try it out with some test volumes.

Re: copy volume (with active mirror relation ship) to another filer

aborzenkov — Wed, 20 Mar 2013 14:08:55 GMT

Yes, it is possible.