As of VMware VirtualCenter 2.5 Update 1, ESX Server 3i systems can only be added to an HA cluster if the system has swap enabled.

This article applies to:

• VMware ESXi 3.5.x Embedded
• VMware ESXi 3.5.x Installable
• VMware VirtualCenter 2.5.x

ESX 3i Servers with swap not enabled will show the following message(s):

An error occured during configuration of the HA agent of the host.
HA Agent has an error : Host in HA cluster must have userworld swap enabled.

To enable swap on the ESX 3i Server: