The Serengeti Management Server leverages vSphere HA to protect the Hadoop master node virtual machine, which can be monitored by vSphere.

When a Hadoop NameNode or JobTracker service stops unexpectedly, vSphere restarts the Hadoop virtual machine in another host, reducing unplanned downtime. If vsphere Fault Tolerance is configured and the master node virtual machine stops unexpectedly because of host failover or loss of network connectivity, the secondary node is used, without downtime.