I''m trying to do nested XEN to give some of my colleagues a play area
to
work in, and it seems to work - but not quite.
I can build the nested environment (using OVM, and I have to step back to
OVM3.2.2 to allow me to do PCI passthrough), but as soon as I start up a VM
with a phys device passed through, the first layer loses all connectivity to
the SAN.
Setup:
* 2 UCS B200M2 blades - configured with 9 vHBAs.
* Linux machines running LIO-ORG''s and SCST''s FCAL
target mode
(trying both to decide on which to use going forwards)
The first vHBA is passed through to the "bare metal" OVM3.2.2, and the
rest
are managed through xen-pciback. I then install another OVM3.2.4 instance
in an HVM with 1 vHBA passed through.
Within the nested OVS (what OVM calls the VM hosts), I can configure access
to disks - and I''m getting up to 130MB/s when I do a
''dd'' - on any of the
LUNs (actually I get up to 130MB/s on the scst LUNs, and 50MB/s on the
LIO-ORG, but they are different hardware).
When I startup the nested PVM (since the HVM xen can''t run an HVM
guest),
Oracle Linux 6 gets as far as ''Detecting hardware'' and hangs -
and an Ubuntu
Xen install attaches to blkback and the provides a countdown as it waits for
the hardware to settle/be available.
At this point, I start to receive messages from the HVM layer about
multipath seeing paths down, and 120s later the OVM instance is rebooted due
to OCFS2 heartbeat issues.
I''m hoping, this weekend, to use a more recent Xen install rather than
the
bundled one in OVM to do this without the Oracle specific parts being
relevant, but I wondered if anyone had experienced this (or a similar)
problem with the fnic driver before?
Thanks,
Graham
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