It all depends how frequent is the power failure. :) You can use the vCenter Heartbeat as an alternate option for vCenter redundancy. Regarding SAN1 and SAN2, you might need to use SRM application for a failover to happen considering both the SAN are on different iSCSI network, Alternatively, you can use VDP as a backup application to backup your VMs on a daily basis if a disaster happens, but then you need to ensure you provide a dedicated SAN to VDP. I wont recommend vCenter to be used on a physical server since its a waste of money and infrastructure. Then whats the point of virtualization.
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