6.0.1

Solution
Check for the noted failure conditions and resolve any that are found.
vSphere HA Agent is in the Network Partitioned State
The vSphere HA agent on a host is in the Network Partitioned state. User intervention might be required to
resolve this situation.
Problem
While the virtual machines running on the host continue to be monitored by the master hosts that are
responsible for them, vSphere HA's ability to restart the virtual machines after a failure is affected. First,
each master host has access to a subset of the hosts, so less failover capacity is available to each host. Second,
vSphere HA might be unable to restart a Secondary VM after a failure (see “Primary VM Remains in the
Need Secondary State,” on page 48).
Cause
A host is reported as partitioned if both of the following conditions are met:
n
The vSphere HA master host to which vCenter Server is connected is unable to communicate with the
host by using the management (or Virtual SAN) network, but is able to communicate with that host by
using the heartbeat datastores that have been selected for it.
n
The host is not isolated.
A network partition can occur for a number of reasons including incorrect VLAN tagging, the failure of a
physical NIC or switch, configuring a cluster with some hosts that use only IPv4 and others that use only
IPv6, or the management networks for some hosts were moved to a different virtual switch without first
putting the host into maintenance mode.
Solution
Resolve the networking problem that prevents the hosts from communicating by using the management
networks.
vSphere HA Agent is in the Network Isolated State
The vSphere HA agent on a host is in the Network Isolated state. User intervention is required to resolve
this situation.
Problem
When a host is in the Network Isolated state, there are two things to consider -- the isolated host and the
vSphere HA agent that holds the master role.
n
On the isolated host, the vSphere HA agent applies the configured isolation response to the running
VMs, determining if they should be shut down or powered off. It does this after checking whether a
master agent is able to take responsibility for each VM (by locking the VM's home datastore.) If not, the
agent defers applying the isolation response for the VM and rechecks the datastore state after a short
delay.
n
If the vSphere HA master agent can access one or more of the datastores, it monitors the VMs that were
running on the host when it became isolated and attempts to restart any that were powered off or shut
down.
Cause
A host is network isolated if both of the following conditions are met:
n
Isolation addresses have been configured and the host is unable to ping them.
vSphere Troubleshooting
26 VMware, Inc.