I thought I would share a hyper-v war stor.
Yesterday someone from central IT called me, as he was going to update
SCVMM to 2012. I said, sounds
great! It wasn’t.
We believed that it shouldn’t bring anything down, as SCVMM mostly
just monitors, so it shouldn’t be a big deal at all. About 3 hours later, I get a call from my
DBA. Production SQL is down, along with
a host of other VMs. The dreaded “missing
config file” error. Now, I should
mention that my vms are on a 3 node Win 2k8 R2 DC cluster. Rebooting physical machines, and moving the
drives around to “working” nodes didn’t work.
I could still browse to the VHDs and the config files. Hyper-v then reported that there was a problem
with a corrupted file.
So as we sitting around, thinking about backup tapes and considering
how to update our resume, I remembered that once I just had rebuilt the config
file for a machine that did this in the past.
Now this current machine that was failing to start had several pass
through disks, memory settings, various NIC configurations that I didn’t want
to have to recreate. I decided to look
into the XML config file. Sure enough,
it ended with :
“<settings>
<global>
<logical_id
type="string">78F….D-4FC2-someotherGUIDdigitshereFB</logical_id>
</global>
<memory>
<bank>
<limit
type="integer">12288</limit>
<reservation type="integer">12288</reservation>
<size
type="integer">12288</size>
</bank>
</memory>
<processors>
<count
type="integer">4</count>
<features>
<limit
type="bool">True</limit>
</features>
<limit
type="integer">100000</limit>
<limit_cpuid
type="bool">False</limit_cpuid>
<reservation
type="integer">0</reservation>
<weight
type="integer">200</weight>
</processors>
<stopped_at_host_shutdown type="bool">False</stopped_at_host_shutdo
“
Now I am no programming wiz, but I know that you at least
have to close XML tags, or computers get angry.
Some quick googlin’ turned up:
So I made a backup copy of the current broken XML doc, then properly
ended the XML tags that were missing. I
then crossed some fingers, right clicked “bring online” and POOF! It worked.
My heart started beating again, and my cell phone quit
vibrating.
