HA. Restart VMs

[vova001]

I want to ask a question about HA.

When the host fail and a master restarts virtual machines on the other hosts. There is restriction - up to 32 concurrent power-on tasks on a host.

If I have 33 virtual machines that need to be restarted on the host, how will select 32 VMs from the 33s?

My guess, VMs will be sorted alphabetically and the first 32 VMs will be launched. But how it happens in real life?

[peetz · Accepted solution]

Hi Robert,

32 is just the limit of *concurrent* power-on tasks, that means HA will

1. initiate the power-on task for 32 VMs (randomly selected if you have not set a restart priority)

2. wait for the power-on events to happen

3. then power-on the next 32 VMs (or only the last one in your case)

Please note that you can assign different HA restart priorities to your VM to influence the order of startup. For details see e.g. here:

vSphere 6.5: vSphere HA What’s New – Part 4 – VM Restart Priorities | BRIAN GRAF

- Andreas