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Hyper-V guest systems has disappeared from the Host's VM Console

Posted on 2009-05-06
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Last Modified: 2013-11-06
I have a win2008 Std 64bit server with the Hyper-v Role Installed and two guest systems in the VM Console (a win03r2 Std running as a member server and a win08 Std running as a pdc  both 32bit)
TrendMicro WFBS is installed and controlled on the PDC and pushed to the member server and the host system.
Everything has been running smoothly and then suddenly after a controlled shutdown of the host (the guests werent shutdown manually first) the VM console had lost the guest systems.
My technician panicked and created new vms and pointed them to the virtual hard disks from the former machines. Problem is they seem to be obsolete version as if the had returned to former snapshots  which by the way are also missing of course.

Questions
1)      Any clues as to what might have happened?
2)      Whats the best practice for reclaiming my guests?

THX in advance
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Question by:spooky-mulder
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Expert Comment

by:bjinfo
ID: 24362892
Hello,

we had the same problem here, it's a known problem with Trendmicro products. You need to add the directory where you will put your virtual servers in every exclusion list in the Trendmicro configuration (real scan, manual scan, etc..) before you configure your virtual server in Hyper-V, otherwise Trendmicro deletes them and you have the phenomenon you describe.

Hope this helps.
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Author Comment

by:spooky-mulder
ID: 24362998
Hi bjinfo,

That's indeed excellent info. We suspected the TM install did something like this so while recovering from the crash we avoided installing TM on the host and so far we havent experienced any problems like before. Combined with your feedback it looks like weve got the answer to our first concern. As for the second question, do you have any experience with best practice on how to reclaim the guests? In our case the .vhd, and snapshot files were available but couldnt get associated to the VMM.

Cheers,

Kenny
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Expert Comment

by:bjinfo
ID: 24363960
Hello Kenny,
so far, in our case we had to reinstall our guests from scratch, because it happened, before we could do any backup of the virtual files, so i cannot answer your second question precisely. But the question is why you could not associate your vhf and snapshot file to the vmm. Any error code shown? If I understand you, your PDC is installed in a virtual guest, i heard somewhere that install a dc alone on an hyperV should be avoided, should always be a second one installed on another physical machine (virtually or not does not matter) for replication and recovery  purpose.  Next week i will try to do a recovery test of one virtual server,  and i will post my results here.

Best regard

Pascal  
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Author Comment

by:spooky-mulder
ID: 24368507
Hi Pascal,

I concur that they should indeed have a second DC. Unfortunately in a few setups like SBS 08 Prem and small office/ small budget installations demanding two separate server  e.g. for sql  that option is not available.
Ill be anticipating the result of your recovery test.
THX in advance.

Cheers,
Kenny
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Accepted Solution

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bjinfo earned 500 total points
ID: 24410365
Hi Kenny,

i did a recovery test from a 140GB Data Server (which i name Virtual Server A) from one Hyper-V Server to a second Hyper-V Server, it worked without any problem, here how i did:

1) Shutdown Virtual Server A
2) Backup the whole directory containing the Virtual Server A (all files inclusiv bin data and vhd)
3) Restore the whole directory on same directory structure on Recovery Hyper-V
4) Configure a new virtual machine pointing on the restored directory (same configuration than source)
5) attach the existing vhd file
6) Start the restored virtual Server

That's it, i could access everything like it would be the original one, but i did not have any snapshot in my case. So could be interesting to know if you your customer had error codes when he tried to attach the vhd. Another point, did he have all snapshots and did he merge them to the vhd file before attaching it. Here is a good article describing a way to do it (i did not try this myself, so not 100% sure if it's working):

http://itproctology.blogspot.com/2008/06/how-to-manually-merge-hyper-v-snapshots.html

Hope this helps.

Best regards

Pascal
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Author Comment

by:spooky-mulder
ID: 24449284
Hi Pascal,

The guide to manually merge the snapshots did the trick. It might not be elegant, but it was definitely efficient.
Thanks allot for your answers, Ill shut down the question and assign you all the points.

Best regards,

Kenny


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