I just received a question around DRS rules and why they are still active when DRS is disabled. I was under the impression this was something I already blogged about, but I cannot find it. I know some others did, but they reported this behaviour as a bug… which it isn’t actually.
Below is a screenshot of the VM/Host Rules screen for vSphere 6.0, it allows you to create rules for clusters… Now note I said “clusters” not DRS in specific. In 6.0 the wording in the UI has changed to align with the functionality vSphere offers. These are not DRS rules, but rather cluster rules. Whether you use HA or DRS, these rules can be used when either of the two is configured.
Note that not all types of rules will automatically be respected by vSphere HA. One thing which you can now also do in the UI is specify if HA should ignore or respect rules, very useful if you ask me and makes life a bit easier: