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VMWare VDR errors -3946 -3956

Posted on 2011-03-23
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Last Modified: 2012-05-11
Having problems using VDR to backup to a NetGear ReadyNAS and/or a SMB share on a 2008R2 server.  I've only got it to backup a virtual XP machine, 2003R2 and 2008R2 VMs fail with either a 3946 or 3956 error.

Get the following errors in VDR:

3/23/2011 11:37:07 AM: Normal backup using Backup Job 3
3/23/2011 11:43:17 AM: Copying DevServer
3/23/2011 11:45:34 AM: File "agcs0090.domain.lcl/DOMAIN/host/agcs0091.domain.lcl/Resources/DevServer/DevServer-000002-flat.vmdk": can't read, error -3946 ( disk open failed)
3/23/2011 11:45:34 AM: Trouble reading files, error -3946 ( disk open failed)
3/23/2011 11:49:23 AM: Task incomplete
3/23/2011 11:49:23 AM: Remaining: 5 files, 40.1 GB
3/23/2011 11:49:23 AM: Completed: 0 files, zero KB
3/23/2011 11:49:23 AM: Performance: 0.0 MB/minute
3/23/2011 11:49:23 AM: Duration: 00:12:15 (00:07:25 idle/loading/preparing)

3/23/2011 11:07:07 AM: Normal backup using Backup Job 3
3/23/2011 11:13:16 AM: Copying DevServer
3/23/2011 11:16:47 AM: File "agcs0090.domain.lcl/DOMAIN/host/agcs0091.domain.lcl/Resources/DevServer/DevServer-000002-flat.vmdk": can't read, error -3946 ( disk open failed)
3/23/2011 11:16:47 AM: Trouble reading files, error -3946 ( disk open failed)
3/23/2011 11:18:30 AM: Task incomplete
3/23/2011 11:18:30 AM: Remaining: 5 files, 40.1 GB
3/23/2011 11:18:30 AM: Completed: 0 files, zero KB
3/23/2011 11:18:30 AM: Performance: 0.0 MB/minute
3/23/2011 11:18:30 AM: Duration: 00:11:23 (00:08:38 idle/loading/preparing)


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Question by:ChocolateRain
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Expert Comment

by:ianmellor
ID: 35205543
Hi,

Check you block size of where your VDR disks are is equal or greater than your VM that you are try to backup?

Hope this helps,
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by:ChocolateRain
ID: 35208962
Yeah our block size for all the accessible storage in our environment are either 1 MB or 2 MB block size.  The VDR appliance is running on a 2 MB block size datastore.
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Expert Comment

by:ianmellor
ID: 35209054
Hi,

Is there a open snapshot on the VM? ALso can you do a manual snapshot of the server, when you do un-tick "Snapshot the virtual machine memory" and tick "Quiesce quest file system (Needs VMware Tools installed)"

Cheers,
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Author Comment

by:ChocolateRain
ID: 35209268
I just got a snapshot to run on a 2008R2 VM with your specified settings (unselect Virtual Machine Memory and select Quiesce guest file system).  This same VM wouldn't back with VDR.
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ianmellor earned 500 total points
ID: 35210339
Hi,

Okay, so a snapshot works. Can you delete the snapshot. Next, make sure you are using the latest version of VDR (1.2.1 is the newest). Also VDR is dependent on DNS being rock solid, just for the test you can add the VM's to the host file on the VDR appliance.  

Cheers,
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Author Closing Comment

by:ChocolateRain
ID: 35287984
The upgrade to 1.2.1 fixed all our problems.
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