- A few things regarding vCLS:
1. You cannot simply power off vCLS VMs. The vCLS monitoring service will power them back on after 30 seconds if you try to shut them down.
2. vCLS VMs can be migrated to other hosts until there is only one host left. If that host is also put into Maintenance mode the vCLS VMs will be automatically powered off. Or if you shut it down manually and put the host into Maintenance Mode, it won't power back on
3. If you want to remove vCLS from the equation altogether, you can enable Retreat Mode (see link below). This is reserved for very specific use cases (such as infrastructure maintenance). It will disable vCLS , and remove all vCLS VMs from the cluster. Bear in mind this will also disable DRS, but if you are shutting down all VMs anyway that wouldn't be an issue. When you disable Retreat Mode after the maintenance has completed, it will recreate the vCLS VMs automatically. In all honesty, you should be fine with option 2 though, i'm just mentioning Retreat Mode as another option for the sake of completeness.
4. You mentioned not having the vCLS password, see last link below to answer that question
- vCLS during Infrastructure Maintenance
- Putting a Cluster in Retreat Mode
- Retreiving Password for vCLS VMs
HTH