On Mon, Jul 06, 2015 at 09:44:07AM +0100, Miguel Barbosa Gonçalves wrote:
I am building a KVM cluster that needs VM live migration.
My shared storage as well as the KVM hosts will be running
CentOS.
Because 10 Gbps Ethernet switches are very expensive at the
moment I will connect the KVM hosts to the storage by
cross-over cables and create private networks for each
connection (10.0.0.0/30 and 10.0.0.4/30).
The following diagram shows the topology
Management ManagementManagement
VLAN VLAN VLAN
| | |
++-+ 10 Gbps +++ 10 Gbps ++-+
| KVM Host |---| Storage |---| KVM Host |
++-+ +++ ++-+
| | |
Public PublicPublic
VLAN VLAN VLAN
My question is: will live migration work in this configuration
since the storage will have 2 different IP addresses
(10.0.0.1 and 10.0.0.5) in 2 different networks even though
it is the same storage?
At the QEMU level this works.
At the libvirt level you may need to be careful how you configure the
storage and domains (VMs). You need to make sure that the storage
network details are not part of the same VM configuration that gets
applied on both hosts.
For example: if you NFS mount or attach iSCSI LUNs to the host and then
just give libvirt the path to the image file, it will work. But if you
want libvirt to do the NFS/iSCSI setup for you then you'll have to dig
into the configuration documentation (http://libvirt.org/) and it may
not be possible.
Stefan
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