# [OmniOS-discuss] NFS Datastore vmware esxi failover

Jim Klimov jimklimov at cos.ru
Fri Nov 8 16:36:55 UTC 2013

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    On 2013-11-08 17:17, Matt Weiss wrote:
    > I am working on a failover script using OmniOS as a NFS server.
    >
    > According to VMware, if I mount and nfs datastore via its IP Address
    > then I should be able to move the IP around and still mount it, however
    > it is not working right.

    As a random guess, can this be related to ARP address caching?
    I think that likely the VMWare hosts continue to connect to the
    same IP address for NFS transactions, which automatically uses
    the MAC addresses that they continue to remember as matching the
    storage IP address, until this knowledge times out or is removed
    by forceful actions.

    Did you have a chance to either wait for 5 minutes, or flush the
    old address out of VMWare hosts? Perhaps, if your new active NFS
    host would "ping" the VMWare hosts, this would update their ARP
    entries (unless the hosts or your network have anti-spoofing)...

    Alternately, you can try setting the same MAC address on the two
    VNICs of the two hosts, but then you'd have to similarly refresh
    the Ethernet switches' knowledge of address-to-port bindings.

    HTH,
    //Jim Klimov

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