I'm not sure I'd have felt guilty for charging them for the full hour. This 
seems like a rather obscure issue-not the type of thing you'd have been 
expected to know (if the latter, then I definitely wouldn't charge). Of course, 
the next time this happens the client (whoever that client may be) will benefit 
since you'll be armed with the extra knowledge. :)



John Hornbuckle, MSMIS, PMP
MIS Department
Taylor County School District
www.taylor.k12.fl.us



From: David Lum [mailto:[email protected]]<mailto:[mailto:[email protected]]>
Sent: Saturday, October 29, 2011 2:31 AM
To: NT System Admin Issues
Subject: Hyper-V VM's and unnecessary heart failure

Remotely working on a %nightjob% client tonight, both a VM and corresponding 
host unexpectedly drop my LogMeIn connection. I see from LogMeIn that other 
systems in that room are online, so I know it wasn't the circuit that dropped. 
Oh joy, I get to drive in (thankfully a short 20 min drive).

I get onsite and the host server is halted at the POST screen for the eSATA 
RAID controller, and the eSATA RAID controller reports a degraded disk on one 
of the two volumes. Power everything off, pull the drives, disconnect/reconnect 
the cables, etc. Power it back up and everything shows good.

So the host comes up (YAY ½ way there! Well...) and I log in and watch for the 
VM to start...it gets to 50% then stops, and after 15 minutes (and you know how 
long 15 minutes is when you're waiting for a *VERY* critical server to come up 
don'tcha?) the VM goes back to "stopped".

As I do full volume backups nightly to the eSATA I'm not too worried yet, but 
even recovering to that this client would lose a day of work (Internet backups 
start at 7pm, servers went offline at 5:13pm). A cursory look at the event logs 
shows nothing exciting, so I change the VM "autostart" from 60 seconds after 
host OS to 500 seconds and then reboot the host.

No change. Joy.

Thinking maybe it's an issue on the host I pull a two week old DISK2VHD file 
that was handier than the backups,  I create a new VM on the host and use this 
VHD. That VM fires up just fine, but it makes me wonder if I can just create a 
new VM and point to the existing disk files for this critical server. I file 
that away for plan B.

I hit the event logs again, I went through both system and app logs for the 
timeframe including 30 mins on either side of the start failures (and you know 
I tried to start that VM more than just those two times...). Somehow I stumbled 
upon one of Windows 2008's 1 zillion new logs, under Windows logs\Applicaitons 
and Services logs\Microsoft\Windows\Hyper-V Worker and I found  my golden 
nugget:

Log Name:      Microsoft-Windows-Hyper-V-Worker-Admin
Source:        Microsoft-Windows-Hyper-V-Worker
Date:          10/28/2011 7:02:45 PM
Event ID:      12140
Task Category: None
Level:         Error
Keywords:
User:          NETWORK SERVICE
Computer:      Host4.thehosed.one.local
Description:
'thehosed.one': Failed to open attachment 
'\\192.168.116.249\Inst-server\Windows 2008 
R2\SW_DVD5_Windows_Svr_DC_EE_SE_Web_2008R2_64-bit_English_X15-59754.ISO'. 
Error: 'The specified network name is no longer available.' (0x80070040). 
(Virtual machine 97527135-A765-4700-AF66-C6FE2143391D)
Event Xml:

Google-Fu then returned a thread to me where someone else was having the same 
issue because about a VM not starting and it turned out to be a CD-ROM driver 
issue. Was the VM was failing to start because I had the CD-ROM mapped to a 
network location that was no longer valid? ARE YOU KIDDING ME? Go into VM 
settings, remove the CD-ROM from the config and boot the VM. Presto! Took me 
just over four hours to find the necessary 2-second config change...

I charge 1.5x my normal hourly rate to break my routine and drive onsite, 
somehow I think just one hour is fairhere  - sometimes the lesson and the 
relief that there was zero data loss for the client is reward enough!
David Lum
Systems Engineer // NWEATM
Office 503.548.5229 // Cell (voice/text) 503.267.9764


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