# [OmniOS-discuss] Active-Active vSphere

Saso Kiselkov skiselkov.ml at gmail.com
Thu Nov 27 20:47:22 UTC 2014

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    On 11/27/14 3:35 PM, Rune Tipsmark wrote:
    > Hi guys,
    >
    > Does anyone know if Active/Active and Round Robin is supported from
    > vSphere towards OmniOS ZFS on Fiber Channel?

    The short answer is: yes, but you wouldn't want to employ Round-Robin on
    it. A ZFS pool can only be imported on a single node, never
    simultaneously on two or more. However, using ALUA it's possible to make
    the LUs on it visible from two OmniOS nodes - this is NOT round robin,
    though. The initiator will see two paths to the LU, but only one should
    be active at any one time (the one that has the pool holding the LU
    imported). Access to the LU over the secondary target will be possible,
    but slow. Upon failover, the secondary would grab the pool and become
    the preferred ALUA path, so it all works out OK. Google "ALUA" for more
    on the theory behind it.

    It is a complicated to set up, though, so be aware of that.

    Cheers,
    --
    Saso

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