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2008 R2 w/Hyper-V - backup error

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2008 R2 w/Hyper-V - backup error - 1.Jun.2011 5:11:07 AM   
sgatke

 

Posts: 11
Joined: 1.Jun.2011
Status: offline
Hello

I have a problem with the backup of our Windows 2008 R2 with Hyper-V server.
The server is recently installed, only with the purpose of being a dedicated host for our virtual servers. At the moment we have 2 virtual servers running: One is Windows 2008 Server Standard 32-bit the other is running Windows Server 2008 R2 Standard.

We would like to use the in-built Windows Server Backup from the physical computer to store our backups on external USB-drives.

However, a few minutes (4 to 8 minutes) after starting the backup, it fails. When I check the vss-writer status, I get the following message:
Writer name: 'Microsoft Hyper-V VSS Writer'
Writer Id: {66841cd4-6ded-4f4b-8f17-fd23f8ddc3de}
Writer Instance Id: {b1a69537-6cba-4fcb-8874-d99aaf7f39ef}
State: [5] Waiting for completion
Last Error: Unexpected Error

I have tried Google'ing the error and it seems quite a lot of people experience this.
One thing I have noticed is, if the virtual machines are shut down, the backups complete without errors.

If anyone could help me solve this problem, I would be forever grateful. I see 2 possible solutions - either I solve the problem, or I find a way to stop and start the virtual machines using a BAT file and Scheduled Tasks.

If you need further information, please don't hesitate to ask for it.

Any help is appreciated.

Thank you in advance.

/Simon
Post #: 1
RE: 2008 R2 w/Hyper-V - backup error - 11.Jun.2011 4:32:27 PM   
Scott Lowe

 

Posts: 444
Joined: 13.May2010
Status: offline
Simon,

Is this a system state backup or a more content oriented backup or both?

Scott

(in reply to sgatke)
Post #: 2
RE: 2008 R2 w/Hyper-V - backup error - 23.Jun.2011 5:09:06 AM   
sgatke

 

Posts: 11
Joined: 1.Jun.2011
Status: offline
Hi and thank you for helping.

The backup is a "complete backup" including System State, virtual machines - everything.

I tried installing Symantec Backup Exec 2010 R3 on the Hyper-V host to see if that went better. Unfortunately, Backup Exec failed with the same error.
I believe I have isolated the error to something related to the VSS writers on the host computer, but how to solve the issue, I just don't know.

Any help at all is very much appreciated.

Thank you.

(in reply to Scott Lowe)
Post #: 3
RE: 2008 R2 w/Hyper-V - backup error - 23.Jun.2011 11:13:56 AM   
georgec

 

Posts: 28
Joined: 16.Nov.2010
Status: offline
Can you run vssadmin list writers from the command prompt and show us the output?

(in reply to sgatke)
Post #: 4
RE: 2008 R2 w/Hyper-V - backup error - 24.Jun.2011 3:27:55 AM   
sgatke

 

Posts: 11
Joined: 1.Jun.2011
Status: offline
Absolutely :-)

The output is here.

vssadmin 1.1 - Volume Shadow Copy Service administrative command-line tool
(C) Copyright 2001-2005 Microsoft Corp.

Writer name: 'Task Scheduler Writer'
Writer Id: {d61d61c8-d73a-4eee-8cdd-f6f9786b7124}
Writer Instance Id: {1bddd48e-5052-49db-9b07-b96f96727e6b}
State: [1] Stable
Last error: No error

Writer name: 'VSS Metadata Store Writer'
Writer Id: {75dfb225-e2e4-4d39-9ac9-ffaff65ddf06}
Writer Instance Id: {088e7a7d-09a8-4cc6-a609-ad90e75ddc93}
State: [1] Stable
Last error: No error

Writer name: 'Performance Counters Writer'
Writer Id: {0bada1de-01a9-4625-8278-69e735f39dd2}
Writer Instance Id: {f0086dda-9efc-47c5-8eb6-a944c3d09381}
State: [1] Stable
Last error: No error

Writer name: 'Microsoft Hyper-V VSS Writer'
Writer Id: {66841cd4-6ded-4f4b-8f17-fd23f8ddc3de}
Writer Instance Id: {bd38510e-b0ae-4b7a-902e-519963d699a3}
State: [1] Stable
Last error: Non-retryable error

Writer name: 'System Writer'
Writer Id: {e8132975-6f93-4464-a53e-1050253ae220}
Writer Instance Id: {7727bcd7-6eb0-4ed6-b081-19871eebb7f3}
State: [1] Stable
Last error: No error

Writer name: 'SqlServerWriter'
Writer Id: {a65faa63-5ea8-4ebc-9dbd-a0c4db26912a}
Writer Instance Id: {fa056d32-ce7a-4d99-a2fe-4334cace3e14}
State: [1] Stable
Last error: No error

Writer name: 'ASR Writer'
Writer Id: {be000cbe-11fe-4426-9c58-531aa6355fc4}
Writer Instance Id: {64281894-48e8-4e27-9856-1702aaee8399}
State: [1] Stable
Last error: No error

Writer name: 'Shadow Copy Optimization Writer'
Writer Id: {4dc3bdd4-ab48-4d07-adb0-3bee2926fd7f}
Writer Instance Id: {a60e792f-c519-4251-826d-ae6b050a25eb}
State: [1] Stable
Last error: No error

Writer name: 'COM+ REGDB Writer'
Writer Id: {542da469-d3e1-473c-9f4f-7847f01fc64f}
Writer Instance Id: {43e6b147-a9f1-4b97-9478-f3d1d1f108d5}
State: [1] Stable
Last error: No error

Writer name: 'WMI Writer'
Writer Id: {a6ad56c2-b509-4e6c-bb19-49d8f43532f0}
Writer Instance Id: {27363cfb-4f5b-4b2d-b26a-8dd1726817be}
State: [1] Stable
Last error: No error

Writer name: 'BITS Writer'
Writer Id: {4969d978-be47-48b0-b100-f328f07ac1e0}
Writer Instance Id: {e6ca386d-52af-4620-b393-f023856f9323}
State: [1] Stable
Last error: No error

Writer name: 'Registry Writer'
Writer Id: {afbab4a2-367d-4d15-a586-71dbb18f8485}
Writer Instance Id: {c118e30a-16e5-4a3c-b602-80631235678d}
State: [1] Stable
Last error: No error

(in reply to georgec)
Post #: 5
RE: 2008 R2 w/Hyper-V - backup error - 6.Oct.2011 8:27:57 AM   
sgatke

 

Posts: 11
Joined: 1.Jun.2011
Status: offline
I believe I have located the source of my VSS problems.
One of the virtual servers that we are trying to backup actually used to run on the same physical server before we virtualized it (usign disk2vhd).
Disk2vhd is a brilliant tool, but unfortunately it keeps the Disk Signature on the new VHD file.
Now, the Disk Signature of our physical disk on the Hyper-V server matches the Disk Signature of the virtual disk on one of the virtual servers. When Windows Server Backup tries to use VSS writers and encounters two identical Disk Signatures, the operation ends in tears.
Now, there is an easy way to provide a new Disk Signature to a VHD file: Shut down the VM, open Storage Manager on the physical server, mount the VHD file (it should come up as 'offline'), right click and select 'online' and Windows should in theory create a new Disk Signature.

HOWEVER, does anyone know what will happen when the virtual server is booted from the disk with the new signature? Will Windows even boot?

Any help is appreciated!

(in reply to sgatke)
Post #: 6

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