Hyper-v Cluster and new AD organisation.

Hello everyone.
We have a very very bad situation.
In one of our new customers we get the following configuraion.
Organisations AD was corrupted and lost 
there are Hyper-v nodes WinSrv2012 in failover cluster hosted on  8x HP c7000 blade system
there is HP P2000 datastore 49.5 Tb full size. 
there isn't VMM (please don't ask me "Why"
2 CSV volumes pesented to cluster (i suppose via Failover cluster services)
And the worst thing we actually don't have any backups. I suppose previous local administrators were irresponsible.
So we have the following behavior of system
We don't able to move Virtual machines between nodes even manually.
DAtastore is full. We cannot create  new LUN because All disks are used.
There are too many critical VM's which couldn't be stopped for a long time.
I have new AD but i can not rejoin nodes to the new domain because almost all node contain critical machines and as i told i can not move ones to another node as well. Also i cannot do it because in this case moved node will deleted from Failover cluster so
in this case i can damage csv volumes.
Actually i can turn off each VM for a little time. 
So i have a question. What is the best solution in this situation. can i use for migrate all hyper-v infrastructure to new AD but keep all most part VHD's in place.
Sorry for my EN. And Thank you in advance.

Ouch, this is a horrible situation.
My advice would be that you
1. Connect a new Hyper-V host to the new domain (You can disconnect one from your old cluster, format it and connect it to the new domain).
2. Configure it as a new cluster, this can be performed with one node.
3. Copy the VM's from the old cluster to the new cluster. Your going to need to work out a way to have enough free space to perfrom this. I would try using local disk space to free up a Lun then assign that Lun to the new cluster. Continue copying untill
another Lun free's up and so on.
4. After all VM's are copied and imported to new Hyper-V you can format the second cluster node and join it to the new cluster.
5. Your going to have to re-join every VM manually to the new domain.
Hope this gives you some insight on a solution for your problem.
Good Luck!
Gil Gross | Technical Lead | G-Net Network Solutions | www.g-net.co.il | plz visit my blog - gilgrossblog.wordpress.com

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