ubergoonz wrote:
It depends on the virtulisation technology adopted. AFAIK, Vmware is pretty good in their vmotion technology in providing High Availability on virtual machines. I also believe RedHat have integrated xen into their cluster services in RHEL 5 to achieve HA cluster fail-over of VMs. It requires a SAN of some sort for access to fault tolerant storage as does the VMWare solution (note the EMC purchase of VMWare Inc). So during a fault a VM can be recovered on another CPU node (as would a service in a regular HA cluster). During normal cluster operations, VMs can be live migrated to allow cluster maintenance with no downtime (this feature has existed in xen for some time). So it does really fit a HA cluster model that limits the points of failure while also offering the consolidation advantage. We have xens running on a small 2 node cluster of machines with an HA SAN storage and we have used RedHat's cluster manager although we have not yet tried the combination of the two together (we are using CentOS4 which hadn't yet integrated xen domains into the cluster manager). So it's probably worth taking a look at RHEL5/CentOS5. Michael.
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