SnapMirror break/reverse

Last post 05-19-2015, 11:29 PM by Watson. 7 replies.
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  • SnapMirror break/reverse
    Posted: 08-21-2014, 5:00 PM

    I'm using Simpana and IntelliSnap for my SnapMirror and SnapVault relationships- overall a huge benefit. I love the additional function that's provided by Simpana. A+ on the added features.


    However, I am really in a twist about how to properly fail volumes over to the mirror in a DR scenario and continue backing them up without angering Simpana. When I break the SnapMirror and reverse the relationship, I suspect that this will cause issues with Simpana, since it is aware of and keeps track of all of these resources.


    Assistance please.

  • Re: SnapMirror break/reverse
    Posted: 08-22-2014, 4:45 PM
    • Ali is not online. Last active: 07-03-2019, 12:32 PM Ali
    • Top 10 Contributor
    • Joined on 08-05-2010

    Hi Dino, curious, what service pack you are on?  I'm not a 100% but checking on this, will come back shortly.

  • Re: SnapMirror break/reverse
    Posted: 08-22-2014, 4:50 PM


  • Re: SnapMirror break/reverse
    Posted: 08-25-2014, 12:42 PM
    • Ali is not online. Last active: 07-03-2019, 12:32 PM Ali
    • Top 10 Contributor
    • Joined on 08-05-2010

    Thanks, could you confirm if this is NetApp or EMC?

  • Re: SnapMirror break/reverse
    Posted: 08-25-2014, 1:37 PM

    NetApp FAS. We have 3250 and 2250s both.

  • Re: SnapMirror break/reverse
    Posted: 08-27-2014, 1:03 PM
    • isle is not online. Last active: 11-20-2019, 3:07 PM isle
    • Top 25 Contributor
    • Joined on 08-21-2012
    • NJ
    • Adept
    • Points 308

    Are you saying you want to promote the vault or mirror to be the primary snap location?

  • Re: SnapMirror break/reverse
    Posted: 09-08-2014, 11:26 AM

    Partly, yes. I'm saying that in a scenario where the primary site goes offline, I want to break the SnapMirror relationship and prmote the SnapMirror destination to the primary. Then, when the primary site comes back up, I want to reverse resync, and when all is caught up, re-establish the original relationships.

    I know exactly how to do this in NetApp and Operations Manager. I have, howver, no idea how (or if) Simpana could roll with the changes. I do not want to wreck my storage policies and datasets in Simpana. I do NOT mind running manual SnapMirror updates and reversing the sync operations in Operations Mnager. I just want to se sure that when the dust setlles that I can use Simpana to run my regular jobs again.

  • Re: SnapMirror break/reverse
    Posted: 05-19-2015, 11:29 PM

    Breaking a SnapMirror relationship makes the destination volume writable.  When you re-synchronize a SnapMirror you are re-establishing the relationship and making the destination volume read only again.  Re-synchronizing a SnapMirror relationship does not re-baseline, it only updates the blocks that have changed since the base snapshot.  

    If a relationship is broken and re-synchronized then subsequent SnapMirror transfers should work inside OnCommand Unified Manager and CommVault as long as OCUM conformance checks are passed.

    Inside my lab on an existing SnapMirror relationship I did the following (a) snapmirror break (b) new snapbackup (c) snapmirror resync (d) new snapbackup (e) snapMirror from commVault

    Let me know what steps you are performing and I can try to reproduce

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