topic Re: Snapshot and snapmirror snapshot schedule in ONTAP Discussions

Snapshot and snapmirror snapshot schedule

1VINAYKUMAR — Wed, 04 Jun 2025 23:34:07 GMT

Hi Guys,

Just want to know, what if the schedule of snapshot and snapmirror snapshot occurs at the same time. which snapshot will take place first.

regards

Re: Snapshot and snapmirror snapshot schedule

richard_payne — Tue, 11 Aug 2015 19:17:39 GMT

So snapmirror snapshots are generated 'on request', since it's pull based. The destination asks for an update from the source. I'm not sure if you're talking about snapshots on the destination (only with qtree snapmirror) or on the source. I would guess that the 'local' snapshot will occur first given that the destiantion has to ask for a snapmirror update and that would add a little latency to the operation. Now would I guarantee it'll always happen that way? Nope 😉

--rdp

Re: Snapshot and snapmirror snapshot schedule

1VINAYKUMAR — Thu, 13 Aug 2015 04:48:47 GMT

Hi Richard,

Thanks for your reply.. just would like to clear the concept. since the snapmirror snapshots are created on request and if the on the same time the normal snapshots are scheduled to create. does it mean the normal snapshot will be created first and the same will be replicated using snapmirror. its a bit confusing for me but if you can elaborate it would be helpful.

regards

Re: Snapshot and snapmirror snapshot schedule

aborzenkov — Thu, 13 Aug 2015 05:18:51 GMT

There is no inherent synchronization between the two schedules. I think, if two snapshots are attempted at exactly the same second, one of them may fail. T is always better to schedule so that they do not overlap.

Re: Snapshot and snapmirror snapshot schedule

richard_payne — Thu, 13 Aug 2015 13:06:06 GMT

"does it mean the normal snapshot will be created first and the same will be replicated using snapmirror."

No, snapmirror will create it's own snapshot. As other have said as well, you're trying something which really doesn't have a defined behavior. You are much better off staggering the schedules so there's no chance of them conflicting.

--rdp

Re: Snapshot and snapmirror snapshot schedule

PIYUSHBANSAL198722 — Fri, 14 Aug 2015 11:06:36 GMT

As per my experience, snapmirror update will fail on the time local snapshot is scheduled