V-79-57344-34036 - An unknown error has occurred.

Posted on 2011-10-05
Last Modified: 2012-05-12

I am having trouble with Backup Exec writing to a HP tape drive. The job keeps failing with an unknown error "A device attached to the system is not functioning. V-79-57344-34036 - An unknown error has occurred."

My setup is as follows.....
HP Proliant ML350 G6 server
HP LTO Ultrium 3 internal tape drive attached to PCIx Ultra 320 SCSI card
This server is running VMware ESXi 4.1 and I have Backup Exec 2010 R3 SP1 installed on an SBS 2011 SP1 virtual machine.
I am trying to backup just the SBS 2011 server but the job always fails with the above error.

Troubleshooting steps taken so far
1. Split the job into individual jobs. Exchange databases only, backup successful. C drive only, backup successful. All other databases and system state, backup successful, D drive only, backup failed. I thought that it may be something to do with the D drive but then when I ran the database only backup again the job failed with the same error.

2. Disabled and deleted the tape drive. Stopped and started all backup services. Drive was detected again but still not working

3. Right click tape drive, properties, configuration, untick "write single block mode" and "write scsi pass-through mode". No change

4. Tried backup jobs without using Advanced Open file option. No change

5. Tried backup with "verify after backup" option disabled. No change

6. Updated driver in Windows to latest version, rebooted server, deleted tape drive in backup Exec, restarted services. No change

Other notes:
This is a fresh installation of everything and all are fully patched. I have not installed any antivirus as of yet.
I don't have enough disk space to test using backup to disk
I am using Symantec drivers for all devices.

Any assistance would be greatly appreciated.
Question by:itfocus

    Author Comment

    One more piece of info...

    All Backup Exec services are started using the built-in domain administrator account apart from the "backup exec remote agent for windows systems" which runs under the "local system" account as recommended by Symantec
    LVL 31

    Expert Comment

    by:Rodney Barnhardt
    My recommendation, based on the error, is to download and run the HP Tape Tools to verify the drive is working properly.

    Author Comment


    Sorry for the delay. I have completed the tests and all tests passed. Any other suggestions?

    LVL 31

    Expert Comment

    by:Rodney Barnhardt
    I found where someone had the same problem. A solution was posted and accepted here on EE:

    Author Comment


    Thank you for my comment. You will see from my original post under point 2 that I have in fact tried this and it did not work.

    We bit the bullet and phoned Symantec support. They made some changes to the security of the service account e.g. "Logon as a service" and "logon as a batch job" rights added explicitly. We are waiting until the client puts a tape in the drive to test


    Author Comment

    This issue is still outstanding.

    It seems the job only fails when a large quantity of data is writtern to the tape. Test writes of larger than 100GB fail consistently.

    HP changed the tape unit and we changed the scsi card and cable.

    Backup to local disk works perfectly

    Accepted Solution

    Since no solution has come forward we have decided to move the backup software and tape drive to another dedicated server. Case closed

    Author Closing Comment

    Closing request as no solution was put forward and a workaround was put in place instead

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