# [OmniOS-discuss] NFS Datastore vmware esxi failover

Chris Siebenmann cks at cs.toronto.edu
Fri Nov 8 17:15:11 UTC 2013

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    | I am working on a failover script using OmniOS as a NFS server.
    [...]
    | I am using zrep to failover my zfs dataset.
    | http://www.bolthole.com/solaris/zrep/zrep.documentation.html
    |
    | Essential, it puts primary into read-only, does a zfs send/receive,
    | then sets the secondary to rw.

     Transparent NFS failover is extremely demanding about the two versions
    of the filesystems being absolutely identical down to extremely low
    level details. It's not clear to me if zfs send and zfs recv replicate
    all of these low-level details; they are certainly not documented to do
    so.

    (At the technical level, the two NFS servers must use identical NFS
    filehandles for all filesystem objects. One problem is that part of NFS
    filehandles for ZFS filesystems is an 'objset unique ID' and as far as
    I can tell the ultimate source of this objset unique ID is *not* set by
    zfs recv; it is set to a unique value by the kernel when the objset is
    created.)

    	- cks

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