Virtual SBS2011 crashes every half hour with EventID 41 (63)

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I have a customer with a very strange problem with their Small Business Server 2011.
This server runs as a virtual server on a 2008R2 Server with HYPER-V.

The SBS crashes about every second hour around the clock without no visible reason.

I have been checking the physical host server for logged events, there is none, plus possible reasons like power failures or local hardware problems.

If I check the SBS's Event Viewer, it tells me that I have about 50 critical events in the last 24 hours. 2 is some Sharepoint stuff which I dont believe is important BUT 48 is EventID 41 "Kernel-Power", task category (63) which says:

The system has rebooted without cleanly shutting down first. This error could be caused if the system stopped responding, crashed, or lost power unexpectedly.

There are no other description what so ever!

Can anyone give me a hint?
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EvilKnievelConnect With a Mentor Commented:
can you check if the power settings in the psysical host bios are set so any balanced of power saving scheme? If so, please try to disable the power mgmt and see if this solves the problem.
Steve MConnect With a Mentor Commented:
When the server crashes is it leaving a dump file behind?  (minidump at least?).  If it is then have a look in the minidump and see if that points you in the right direction as to what could be causing this crash.

How to read a minidump:

OhmitAuthor Commented:
Hi Evil :-)  Right now I only have remote desktop access to this system.  I can confirm that in the lower right corner, I see the Power Managemen icon whis normally is only visible on laptops.  The power plan was set to balanced.  I changed this to hight performance and disabled the schedule for turn down monitor and harddisk.

When I did this the system was running for allmost 36 hours!! the suddently it crashed again with the same error.

Do you mean, that I have to go to the BIOS of the physical server and look for Power Management?

PT Im downloading some analyzer tools to look in the dumb file.
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OhmitAuthor Commented:
Ok Im giving up debugging the dumb file.
I have attached it here, hoping anyone can help
Steve MCommented:
I ran your dmp file, and attached the results.

It points to the Microsoft iSCSI initiator driver as a possible issue.

Steve MCommented:
Does your SBS server have iSCSI connections?
OhmitAuthor Commented:
When closer examined, it appeared that the ISCSI Initiator service was running.
In control panel I checked the Iscsi initiator, and it looks like there have been an old connection to a NAS device.
We will know in the next 48 hours if this helps :-)

Steve MCommented:
You're welcome - I hope it works out for you!

OhmitAuthor Commented:
Thank you so much for your input. I have been granting points to both of you because both solutions seems to have helped.
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