DRS recommendations

[Mark Budman]

Hello,

I have an environment with 15 ESXI hypervisors. The environment is set to partial automation. I have implemented  affinity / anti-affinity rules and I use the command :

get-DrsRecommendation

which contains recommendation on where virtual machines should be hosted.

However, even though I follow the set of recommendations, every time I migrate a VM, DRS makes another recommendation.

I have tried:

1. moving all the VMs to recommended hypervisors
2. Just moving one VM to the recommended hypervisor

However, a new recommendation is always generated, with the majority of time for VMs that were migrated based on previous recommendations

It seems that there are continuous soft affinity rule violations.

Does anyone know how I can implement the recommended changes from DRS and not have new recommendations pop up? This seems never ending

Thanks in advance!

Mark

[Alexandru Capras]

Hi Mark,

What version of vSphere is your environment running?

[Mark Budman]

Hi Alexandru,

We have vSphere 7.0.3 build 22837322.

Thanks!

Mark

[Duncan Epping]

Do you have a large numbers of DRS rules? As it could be that conflicting rules are creating this trickling effect. 

[Mark Budman]

Hi Duncan,

I do have a large number of DRS rules, but they are not overly complicated. The rules basically divide the VMs amongst the available hypervisors; 

I have divided the hypervisors into two groups. Half of the VMs are allocated to group 1 and the other half to group 2. 

I then have rules where certain VMs cannot be hosted on the same hypervisor, but there are more than enough hypervisors to support this scenario.

Thanks!

Mark