Backup & Recovery 10 Advanced Virtual - backup fails if hyper-v VM disk attached through symbolic link

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Posts: 5
Comments: 5

Hi! I'm evaluating Acronis B&R 10 Advanced Virtual Edition and have troubles with backup. On two of my Hyper-V VMs (one - Win2008 server, second - Win2003 server) backup fails. Other VMs backup are ok. I try to investigate the problem and found what both this VMs are using "fixed size" VHD disks (other VMs use dynamic). Host computer is Windows 2008 Server (Hyper-V v1). But the same problem on second computer with Windows 2008 Server R2 (Hyper-V v2). I'm using latest (12497) build of ABR. Below is a sample error log. This is very strange, does Acronis B&R 10 AVE have problems with fixed size vhd disks? Regards, Yuri

sample error log:
1 Information 26.11.2010 3:48:23 Priority changed to Low.
2 Information 26.11.2010 3:48:26 Accessing VHD file snapshot 'C:\hyper-v\vms\srv-router\Snapshots\1D1F86DC-B00D-4440-8B05-50F676FD8CBE\srv - router fixed_7644242B-6731-480C-8907-46D2CE96EBC3.avhd'...
3 Information 26.11.2010 3:48:28 Attempting to create a multi-volume snapshot.
4 Information 26.11.2010 3:48:28 Adding 'C:\hyper-v\vms\srv-Router' to multi-volume snapshot...
5 Information 26.11.2010 3:48:28 Adding 'C:\hyper-v\vms\srv-router\' to multi-volume snapshot...
6 Information 26.11.2010 3:48:28 Adding 'C:\hyper-v\vms\srv-router\Snapshots\1D1F86DC-B00D-4440-8B05-50F676FD8CBE\srv - router fixed_7644242B-6731-480C-8907-46D2CE96EBC3.avhd' to multi-volume snapshot...
7 Information 26.11.2010 3:48:28 Adding 'C:\hyper-v\vms\srv-router\disks\srv - router fixed.vhd' to multi-volume snapshot...
8 Information 26.11.2010 3:48:28 Setting up the 'use VSS' option...
9 Information 26.11.2010 3:48:28 VSS component is included in the multi-volume snapshot: [writer class='66841CD4-6DED-4F4B-8F17-FD23F8DDC3DE', writer instance='00000000-0000-0000-0000-000000000000', component name='1D1F86DC-B00D-4440-8B05-50F676FD8CBE'].
10 Information 26.11.2010 3:48:30 The multi-volume snapshot has successfully been created.
11 Error 26.11.2010 3:48:30 Failed to open raw hard disk data file 'srv - router fixed_7644242B-6731-480C-8907-46D2CE96EBC3.avhd'.
Additional info:
--------------------
Error code: 94
Module: 83
LineInfo: 383ffdb092990da7
Fields:
Message: Failed to open raw hard disk data file 'srv - router fixed_7644242B-6731-480C-8907-46D2CE96EBC3.avhd'.
--------------------
Error code: 94
Module: 83
LineInfo: 383ffdb092990dea
Fields:
Message: Failed to open raw hard disk data file 'srv - router fixed_7644242B-6731-480C-8907-46D2CE96EBC3.avhd'.
--------------------
Error code: 2
Module: 60
LineInfo: ceff4fee961a414f
Fields:
Message: Error: unable to open virtual disk.
--------------------
Error code: 17
Module: 4
LineInfo: 497a70fdd71a3fb8
Fields:
Message: The specified file does not exist.
--------------------
12 Error 26.11.2010 3:48:30 Source is not selected. The operation has been terminated.
Task 'srv-Router - Level 2 backup' has failed on machine 'server2008.binarysense.local'.

Attachment Size
sysinfooutput.zip 5.15 MB
Fri, 11/26/2010 - 13:57
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truwrikodrorowrelupicugojestutroclulachosaswunuhospikigawakijosaswenomaruclojeueclikaspedrubewidebrisubrohutrurifruuagothunugekedrumucisiuobrobrecrupeslapuswosluprothethibakaslechurathikucli
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Comments: 5

I found source of error - this is not a fixed disks fault. The problem with NTFS symbolic link.
Let me explain. For example, I use C:\Hyper-V for Hyper-V VMs, but after some time - no free space on drive C:, so we just move (keeping access rights) some folders with disks files (vhd) to another drive and make a symbolic link (symlink) to this folder in source folder on drive C:
So, we don't need to change anything in VMs settings and it keeps running as usual.
But if we try to backup this VM using ABR - we receive error as above. If we change VM settings, so attached disks paths will show to real .vhd files (not through symbolic link) - all backups are successful.

Yes, I understand what this scheme with symlinks are not good, but sometimes we need to use it :)

ps: I change subject of topic, so it tells about real problem.

Mon, 12/06/2010 - 22:14
truwrikodrorowrelupicugojestutroclulachosaswunuhospikigawakijosaswenomaruclojeueclikaspedrubewidebrisubrohutrurifruuagothunugekedrumucisiuobrobrecrupeslapuswosluprothethibakaslechurathikucli
Forum Star
Posts: 88
Comments: 4769

Hello Yuri,

Thank you for posting.

I really appreciate that you have taken the time to report your findings. Although we do not support symlinks at the moment, we have created a task for our Development team to either implement the support in the next builds of Acronis Backup&Recovery or at least create more comprehensible error messages, so that the cause of this issue is clearly understood.

If you need additional assistance, please let me know.

Thank you.

Tue, 12/07/2010 - 11:38
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