The new Knowledgebase blog has just posted a table of brand new (or recently updated) timekeeping articles for VMware products.  A nice one-stop shop for all the time related KB articles. Worth a visit.

Just a quick post-
Multiple symptoms, one solution>>
Symptoms:
1. Unable to ssh into your ESX host
2. Unable to login to the ESX console
3. ESX shows not responding in VirtualCenter
4. HA error (but esx host responding)
5. Unable to VMotion (but esx host responding)
Check ps output and if you see
# ps -ef
root 6232 0.0 0.0 0 0 ? Z [...]

After upgrading to Virtual Center 2.5 Update 2 you may notice that guest VMs no longer automatically VMotion off the host when you attempt to put it in Maintenance Mode.
This is a new behavior introduced in Update 2.
Virtual Machine Migrations Are Not Recommended When the ESX Server Host Is Entering the Maintenance or Standby [...]

With the new Virtualcenter 2.5 Update 2 comes some tighter restrictions on HA network configurations.  This error message commonly occurs when the nodes in a cluster contain incompatible networks. An attempt to reconfigure clusters might fail now if they do not have identical networks.
Some customer are reporting the message:

HA agent on <esxhostname> in [...]

As soon as Update 2 of Virtualcenter 2.5 hits the streets we started getting calls into support lines here at VMware about HA breaking.
Common reports include:
“insufficient resources to satisfy HA failover level on cluster” and “unable to contact a primary HA agent in cluster”
We think we know what is causing this, so I’m sharing this [...]