Hello all,
we are currently evaluating a migration from Xen to KVM.
We host our VMs on a SAN, access to LUNs is done by the iSCSI protocol,
all multipathed.
With Xen, we faced a problem when VMs were consuming a lot of CPU and a
lot of I/O. In this situation, the Dom0 did not get enough CPU time to
process the I/O requests through the iSCSI processes and to run the
iscsid daemon. So, the Dom0 was always loosing the iSCSI connection to
the SAN because of timeout (node.conn[0].timeo.noop_out_timeout).
We solved it by dedicating a core to the Dom0, as recommended in the Xen
FAQ.
Can this happen with KVM ? Why can(not) it happen ? If it could happen,
what is the recommended solution (renice, cgroups, ...) ?
Thanks for your help.
--
Romain LE DISEZ
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