Q:
How can VMware VI3 servers be clustered?
VMware, High Availability, Learning Guides, Virtualization and hardware, VMware ESX, Virtualization how-tos, VI3, VMware Infrastructure 3 I want to Cluster 2 ESX VI3 Servers. Should I use Veritas Cluster for ESX or VMware HA? I am told that VMware HA does not protect from individual VM failures whereas veritas does.
ASKED:
May 21 2008 2:11 PM GMT
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A:
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VM Failure Monitoring, a.k.a. VM HA, allows you to direct a VM to be restarted on the same ESX server or to be VMotioned to another ESX server in the event that the VM fails. A heartbeat is maintained between VI and the VM to detect failure. To configure VM HA you must edit an advanced value in a cluster's HA configuration screen. The PDF I linked shows you how to do that. Per the PDF, VM HA works like this:
- If no heartbeat is received from a virtual machine for 60 seconds or more, VMware HA resets that virtual machine.
- A virtual machine is allowed 240 seconds to stabilize after startup. This allows the virtual machine to perform a reset of the operating system and of VMware tools.
- If the virtual machine fails three or more times in a day, VMware HA does not reset the virtual machine.
