VSAN-Troubleshooting-Reference-Manual

Diagnostics and Troubleshooting Reference Manual – Virtual SAN
Virtual SAN and vSphere HA network dependency
vSphere HA is fully supported on Virtual SAN cluster to provide additional
availability to virtual machines deployed in the cluster. If a host fails, vSphere HA
will take responsibility for restarting any VMs that had their compute running on
the failed host. Virtual SAN will ensure that the storage objects residing on the failed
host are reconfigured elsewhere in the cluster, if resources are available to do so.
There have been a number of changes made to vSphere HA to ensure correct
interoperability with Virtual SAN. Notably, vSphere HA agents use the Virtual SAN
network for communication when Virtual SAN is also enabled on the cluster.
vSphere HA & Virtual SAN must be partitioned in the same way if a network failure
occurs. This avoid issues arising if vSphere HA & Virtual SAN are partitioned
differently and the different partitions try to take ownership of the same object.
To enable both Virtual SAN and vSphere HA on a cluster, Virtual SAN must be
enabled first, followed by vSphere HA. You cannot enable Virtual SAN if vSphere HA
is already enabled.
To disable Virtual SAN on a cluster with vSphere HA also enabled, one must first of
all disable vSphere HA. Only then can Virtual SAN be disabled.
Changing the vSphere HA network
If both Virtual SAN & vSphere HA are enabled on a cluster, and the administrator
wishes to make changes to the Virtual SAN networks, note that these changes are
not automatically detected by vSphere HA. Therefore a vSphere HA cluster
reconfiguration must be initiated by the administrator so that vSphere HA can learn
about these new changes.
V M W A R E S T O R A G E B U D O C U M E N T A T I O N / 1 0 1