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 [...]

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 [...]