Do we need Snapshots on our aggregates?

[SISTEMAS_LAVOZ]

Dear mates, our question is very simple.

We have two Storage Processors on a FAS2240-4 Chassis that are replicating volumes (Through SnapMirror technology) to another FAS2240 Chassis on a remote/different DataCenter.

We do NOT replicate the whole aggregates that contain these volumes and we will NOT need to revert an entire aggregate to a previous state.

In this scenario, is it needed/advisable to have:

- The aggregate snapshots scheduling active ?

> snap sched -A

Aggregate aggr0: 0 1 4@9,14,19

Aggregate aggr1: 0 1 4@9,14,19

- The 5% aggregate snapshot reserve?

netapp2-spa> aggr options aggr0

...... percent_snapshot_space=5%,

May we disable scheduling and set percent_snapshot_space=0%?

Thank you so much in advance

[JGPSHNTAP]

That's the default out of the box configuration.

In my case, I do snap sched -A aggr0 0 immediately and remote any snaps

that might be there.

I don't see a reason why you need aggregate snapshots in your case

Also, another way to check your aggrs reserve is

snap reserve -A

From: severino santirso fernandez

<xdl-communities@communities.netapp.com>

To: Josh Goldfarb <josh.goldfarb@prudential.com>,

Date: 04/22/2014 12:25 PM

Subject: - Do we need Snapshots on our

aggregates?

Do we need Snapshots on our aggregates?

created by severino santirso fernandez in Data ONTAP 7G/8.x 7-Mode - View

the full discussion

Dear mates, our question is very simple.

We have two Storage Processors on a FAS2240-4 Chassis that are replicating

volumes (Through SnapMirror technology) to another FAS2240 Chassis on a

remote/different DataCenter.

We do NOT replicate the whole aggregates that contain these volumes and we

will NOT need to revert an entire aggregate to a previous state.

In this scenario, is it needed/advisable to have:

- The aggregate snapshots scheduling active ?

snap sched -A

Aggregate aggr0: 0 1 4@9,14,19

Aggregate aggr1: 0 1 4@9,14,19

- The 5% aggregate snapshot reserve?

netapp2-spa> aggr options aggr0

...... percent_snapshot_space=5%,

May we disable scheduling and set percent_snapshot_space=0%?

Thank you so much in advance

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[ekashpureff · Accepted solution]

Severino -

You may wish to read this old article on aggregate snapshots: https://communities.netapp.com/thread/11659

I hope this response has been helpful to you.

At your service,

Eugene E. Kashpureff

Independent NetApp Consultant, K&H Research http://www.linkedin.com/in/eugenekashpureff

Senior NetApp Instructor, Unitek Education http://www.unitek.com/training/netapp/

(P.S. I appreciate points for helpful or correct answers.)

[SISTEMAS_LAVOZ]

Thank you so much for both answers.

In our case, we will not use:

     - SyncMirror (Replication on a aggregate basis), and

     - Snap Restore off an entire aggregate

but only because the correction of a corrupted WALF fs volume with wafliron is much quicker if you have an aggregate snapshot we will keep

aggr snapshot scheduling and we will keep snap reserve at 5%

Best Regards

[GLENDONLOWDER]

For some reason I can't access your link:
http://community.netapp.com/thread/11659
can it be reposted somewhere where we can all get to it?

[tgottenoef]

same to me, i cant open the link