A few of the forums and other blogs are reporting Problems with Update 2 HA….

Usual issues include:

“insufficient resources to satisfy HA failover level on cluster” and also “unable to contact a primary HA agent in cluster”

The following should help you out:

All hostnames need to be in lower case only.

In Virtualcenter check the following:

• On each host in the cluster, go to the configuration tab, DNS and routing, hostname, everything needs to be lowercase

On each one of your ESX hosts:

ssh into each host and check lower case names only

• /etc/hosts lowercase names only
• /etc/sysconfig/network
• cat /proc/sys/kernel/hostname if not correct :

hostname <FQDN>

• after this you can check the settings are correct using

  uname -n

  hostname -a

  hostname -s

  hostname -d

  hostname -f

  hostname

• make sure hostname in /etc/vmware/esx.conf is lowercase

  /adv/Misc/HostName = <FQDN in lowercase>

  Once these are checked enable HA on cluster again and cross your fingers.