1) what happens if the SATADOM fails ?
2) Is there any redundant mechanism available to withstand failure ?
Best answer by patrbng
If the satadom fails then the hypervisor fails and the VM's will see it as a node failure. If vSphereHA is setup, the VMs should recover to the other nodes in the cluster as long as compute/memory capacity exists to run them. It's recommended to setup vSphereHA with admission control enabled to ensure that capacity is available. The VM's when they restart will read their blocks of storage from whatever local RF data on the node it is running on. If the RF data isn't on the node it will get the storage over the network and if it needs the data more often, the data will be replicated back to the VM's host node for data locality. If the failed node remains offline long enough, it will be marked as out of the metadata ring and the protection data will be re-created on the remaining nodes.