esx.problem.vmfs.heartbeat.timedout
Summary
Host connectivity to the volume degraded as the VMFS heartbeat failed.
Causes
Host was unable to renew its heartbeat for 16 seconds or longer.
Resolutions
For more information on the problem and resolution steps, see VMware KB article Host Connectivity Degraded (1009557).
External
Refer to the VMware Online Documentation, especially the vSphere Troubleshooting Guide, for more information on vCenter event messages and possible solutions.