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Specific questions about vmware & NAS

V

vxspiritxv

[H]ard|Gawd
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I want to build a cluster that if you pull the power on any one machine VMs will ether stay up or restart them selves on machines that are still up. I'm thinking two NAS boxes, three ESXi boxes and two switches.

NFS vs iSCSI , is there a reason to run one over the other? I plan to play with openfiler.

The 2nd NAS box, can it be way slower than the main NAS? ie does vmware cluster NAS data or can it be ran in backup/failover mode? Can it be mixed, iSCSI main, NFS backup? Do vms need to reboot if there is a failover of this type?
 
OF - run NFS to be supported, and to work right at the moment.
We do not cluster NAS data, there currently is not storage HA or the like, only VM HA (host based).

So, in other words, you can do half of what you want to do. :)

There are some HA solutions for storage where they take over the IP of the failed storage node - those can/will work, but are often not free.
 
What about disks on every server then? what will ESXi do with this disks when the machines are configured in a cluster, can it duplicate data across systems?
 
We are doing something similar with Hyper-V in a test environment. Two HyperV servers in an active-active cluster with a OF iSCSI box attached, and then a second OF box in an "offline" state that the first one is replicating Data to via DFS. If one of our servers goes down all the guest VMs come up on the other server automatically, then when their preferred server comes back online they fallback to the original hypervisor. Unfortunately if we have our storage appliance fail we manually have to switch boxes, but this is the best we could do without having a EMC or LeftHand Cluster.
 
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