But disabling HA and Admission Control doesn't prevent what is going to happen in this situation.
Your VMs are replicated between locations, and you have VMs in both preferred and the secondary. When the ISL goes down, the Preferred location will bind itself with the witness, the secondary will lose access to the witness. Which means that ALL virtual machines in the secondary instantly lose access to storage and will be marked inaccessible and killed by vSAN.
NORMALLY they would be restarted by HA in the preferred location, but in this case if you disable HA then nothing would happen.
I would highly recommend moving ALL the virtual machines to the preferred location before doing the maintenance.
