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Hyper-V failover cluster problem

We got a call today.  Something we've never seen before.  It looks like the IT has not added any DC outside the Hyper-V R2 cluster (failover cluster ion Windows 2008 R2)

During an electric failure in their office both hosts went down.  Off lcourse all DCs (VMs part of the cluster)  are down now.

As far as I know Windows failover cluster must access the Active directory to operate.  Is there something we can do to get at least the DCs back online ?  

I've been trying to start the VM from the hyper-v manager  (saved-critical) but I got "failed to restor virtual machine state".  

I can access the cluster through the IP, but it doesn't help much.  I  can read the warning "The cluster network name is not online".  As no Dc are available the name can not been used (no DNS)

And guess what?  All VMs but SCVMM were managed from SCVMM.  

From the failover cluster I've been trying to restart the VMs But I had no much success

The disks (iSCSI SAN) storage and CSV are still online.  But I'm unable to start any VM

Any advice is welcomed.  

Thank you    

 
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quadrumane
Asked:
quadrumane
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1 Solution
 
reijerCommented:
You need an active directory in order to start cluster services.
Without an active direcory domain you cannot start the cluster services.
And without the cluster services the hyper-vs won't start.

1. restore or copy the vhd with the last domain controller on different hardware and run it so you have running active directory. Then you can start the cluster services and start the hyper-v vms. Then shutdown the temporary domain controller and copy back the vhd to the original cluster and start it again.

2. try the same option on the same hardware trough hyper-v manager.
I think option 1 is better because the cluster server needs dns at startup to start the cluster services.

I did have a same scenario by mistake, i now have a dedicated dc so this will not happen again!

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quadrumaneAuthor Commented:
CSV is enabled.  I'm unable to access the VHD.  I could remove the storage from the cluste shared volumes but I want to make sure that I can without losing all VHD on the volume I removed from CSV
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reijerCommented:
you can assign a drive letter trough disk management.
you the have to connect only one host to your storage (so it will be the owner)
Then you can copy out the vhd.
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quadrumaneAuthor Commented:
But don't you  think I should remove the storage from CSV before doing that?  
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reijerCommented:
Can you do that if the cluster is not functioning? I don't think thats a good idea. if you can assign a drive letter and unassign it after use i think the csv stays as it should be. But dont know for sure.
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quadrumaneAuthor Commented:
I'm working from the host (owner of all storage) but when I select "change drive letter and path" to assign a letter, the letter is not assigned.  Nothing happened.   I do select the letter, but I guess a mecanism in the failover cluster is preventing the drive from having a letter assigned?  
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reijerCommented:
Damn thats bad! i hope you backup your vhds so you can restore it.
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reijerCommented:
If you connect your storage to an other server, you can acces you data. p.s. did you also put your harddrive online in the disk management.
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quadrumaneAuthor Commented:
Fortunately It's not my network.  But we helped them out.   That told, for a reason or another, everything is not back online.  I was doing a lot of things so I'm not sure how I got this back online.

Anyhow, I think you had the best second solution (the first one is to be very lucky :)
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