Comments on: Anti-affinity rules are not honored in cluster with more than 2 virtual machines

By: Keith Howells

Keith Howells — Tue, 31 Mar 2009 02:28:18 +0000

I hope it’s adjusted in the next revision… we ended up splitting our load balanced front end VM’s across multiple clusters (odds in 1; evens in another); still had to setup plenty of anti-affinity rules though which is no fun

By: wharlie

wharlie — Mon, 30 Mar 2009 01:03:00 +0000

Totally agree, why hasn’t it been fixed despite numerous upgrades and patches.
BTW the formula for calculating how many affinity rules you require is {n(n-1)/2}, where n is the number of vm’s in the rule.
e.g a rule to seperate 10 vm’s would require 45 seperate rules.
One client of mine had a cluster of 26 citrix vm’s that he wanted in an anti-affinity rule (yes we have more than 26 esx hosts), didn’t end up doing it.

By: Keith Howells

Keith Howells — Fri, 27 Mar 2009 21:47:15 +0000

Yep; pain in the rear; encountered in the environment I used to support as well; where we had many web servers load balanced behind F5 attached VLANs across and had to create rules for all combination’s; perhaps this is fixed in the upcoming vSphere?? I have not seen the beta yet to confirm….