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 Management Management > VLAN VLAN VLAN > | | | > +----+-----+ 10 Gbps +----+----+ 10 Gbps +----+-----+ > | KVM Host |-----------| Storage |-----------| KVM Host | > +----+-----+ +----+----+ +----+-----+ > | | | > Public Public Public > 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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