3 Replies Latest reply: Jan 11, 2013 6:12 AM by bondbhola RSS

Fabric Metrocluster - Root Aggregate mirror?

Willybobs27 Sprinter
Currently Being Moderated

In a Fabric Metro Cluster does the root aggregate have to be sync mirrored to the remote site?


I think the answer is no.


Also do Aggregates for site A have to be on different physical shelf to the mirrored aggregates from Site B due to hardware ownership?

  • Re: Fabric Metrocluster - Root Aggregate mirror?
    aborzenkov Grand Marshal
    Currently Being Moderated

    Yes, root aggregate must be mirrored, otherwise no takeover can happen if site is lost.


    You are correct, with hardware based disk ownership each filer owns whole shelf.

  • Re: Fabric Metrocluster - Root Aggregate mirror?
    stjerna NetApp Employee Cyclist
    Currently Being Moderated

    You don't HAVE to mirror the root aggregate but my advise to MetroCluster customer that does not want to mirror everything is - "If you only mirror one thing, that should be the root aggregate". As aborzenkov says a disaster takeover will not be possible and then you have pretty much lost the purpose of running a MetroCluster.


    Modern NetApp controllers use software disk ownership, in standard setups as well as in MetroClusters.

    The last controllers that used hardware disk ownership were the FAS3020's and FAS3050's.


    With software disk ownership, you can mix ownership in individual shelves.

    My advise is to refrain from doing so if possible. Using whole shelves and dedicated switch ports (Fabric MC) or HBA ports (Stretch MC) for disks owned by the 2 controllers will make day-to-day operations easier. You can have disk.auto_assign enabled and working for you when you replace disks, identifying a disk to be replaced is easier etc.

  • Re: Fabric Metrocluster - Root Aggregate mirror?
    bondbhola Sprinter
    Currently Being Moderated

    Answer is YES.


    In metrocluster all aggrgeate  would be in syncmirror.


    Bhola Gond

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