I apologize if this is a little off-topic, but it does relate to Xen and using
NPIV on Xen, so I think this is an appropriate forum for the question.
I''ve recently begun using NPIV for a couple of Xen PV domUs rather than
traditional disk passthrough. My reasons are primarily for performance -
I''m hoping that NPIV has lower overhead and lower reliance on the
resources of dom0 so that the performance in the domU is better. In any case, I
did a firmware update on my SAN controllers last evening, an upgrade that was
not supposed to impact connectivity to the SAN, as I have redundant SAN
controllers and the upgrade reset the controllers in sequence so that hosts
would still be able to talk to the SAN. This worked perfectly for all of my
physical machines and virtual machines, except for the ones using NPIV, which
crashed miserably. I ended up having to reboot my dom0/host to get it to see
the disks correctly. I''m wondering if anyone has any experience with
this, or any hints on configuring NPIV correctly for a fail-over situation? My
disk configuration is as follows:
disk=[
''phy:/dev/disk/by-id/scsi-36000d31000083c0000000000000000cb,xvda,w'',
''npiv:2001000dec8f9741-8888888810002000-8888888800000002-5000d31000083c0a-1,xvdb,w'',
''npiv:2001000dec8f9741-8888888810002000-8888888800000002-5000d31000083c0a-2,xvdc,w'',
''npiv:2001000dec8f9741-8888888810002000-8888888800000002-5000d31000083c0a-3,xvdd,w'',]
As you can see, I''m attaching one disk via passthrough (my system
disk), and the other three via npiv (data volumes). The fourth and final set of
hex numbers there is the WWN of one of the FC ports on one of my SAN
controllers. I''m still a little fuzzy on how my SAN handles the
failover, but I''m wondering if the fact that I''m pointing at a
specific WWN is causing problems?
Any help/advice would be appreciated!
Thanks,
Nick
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