Avatar of piedthepiper

asked on 

When enabling HA on a cluster some VMs try to failover and fail? vCenter 5.5u3b ESXi5.1

So I upgraded vCenter from 5.1 to 5.5u3b, I disabled HA/DRS before the upgrade and when I re-enabled HA post upgrade on the cluster (ESXi5.1) 4 hosts in the cluster started to attempt HA failover. This happened at the exact same time the HA agents were being installed on all the hosts in the cluster?

Nothing actually failed over, but I got a bunch of "vSphere HA virtual machine failover failed" cluster level alarms.

The cluster is a mix of dell r710 and dell r720 hosts, and it was only the r720 hosts that this happened on. Yet I have another cluster with just r720 hosts where this didn't happen. They all run ESXI 5.1 and are all on the same firmware/BIOS etc.

Since it happened as the HA agent was being installed on the all the hosts in the cluster, I am assuming it was some kind of glitch? I haven't found any KB articles relating to it

Avatar of undefined
Last Comment
Andrew Hancock (VMware vExpert PRO / EE Fellow/British Beekeeper)
Avatar of Andrew Hancock (VMware vExpert PRO / EE Fellow/British Beekeeper)
Andrew Hancock (VMware vExpert PRO / EE Fellow/British Beekeeper)
Flag of United Kingdom of Great Britain and Northern Ireland image

Blurred text
View this solution by signing up for a free trial.
Members can start a 7-Day free trial and enjoy unlimited access to the platform.
See Pricing Options
Start Free Trial
Avatar of piedthepiper


I thought as much, I just wanted to make sure. As it happened at the exact same time as the agents were being installed on the hosts.

Actually HA was never even enabled before I started here lol I have configured % failover on the clusters for N+1. But it hasn't been fully tested,.....yet. it is on my list along with getting SRM up and running!
I would recommend you test VMware HA, before Production, and be brutal, and just power OFF a Host!

It does not have to have Production VMs, Test VMs, will do, but then at least you know, what to expect, if it all works!
Avatar of piedthepiper


I agree pulling the plug is the best way to test it.

Cheers Andrew!

VMware, a software company founded in 1998, was one of the first commercially successful companies to offer x86 virtualization. The storage company EMC purchased VMware in 1994. Dell Technologies acquired EMC in 2016. VMware’s parent company is now Dell Technologies. VMware has many software products that run on desktops, Microsoft Windows, Linux, and macOS, which allows the virtualizing of the x86 architecture. Its enterprise software hypervisor for servers, VMware vSphere Hypervisor (ESXi), is a bare-metal hypervisor that runs directly on the server hardware and does not require an additional underlying operating system.

Top Experts
Get a personalized solution from industry experts
Ask the experts
Read over 600 more reviews


IBM logoIntel logoMicrosoft logoUbisoft logoSAP logo
Qualcomm logoCitrix Systems logoWorkday logoErnst & Young logo
High performer badgeUsers love us badge
LinkedIn logoFacebook logoX logoInstagram logoTikTok logoYouTube logo