Sorry for the late reply.
The environment only consists of instant clone VDIs.
Disabling the pool is not an option because reconnecting to a disconnected VDI is not possible as already mentioned.
Disabling pool provisioning is the best option because you will always have a minimum number of VDIs (2) left in each pool. We currently have 7 pools, so 7 VDI will always be available.
So, ideally, I would like to put on POD in maintenance on the highest level and disable the pool for new connections, but reconnection to a disconnected session should be possible.