Tandberg RDX Quickstor backup disk drive slow on BackupExec 11d.

Posted on 2009-02-18
Last Modified: 2013-12-01
Just had a new server put in, with a Tandberg RDX Quickstor backup disk drive. It's supposed to run at 45Mb/Sec , but we're only getting 5Mb/Sec on Symantec BackupExec 11d.

Can anybody shed some light on this?
Question by:McArdleGroup
    LVL 23

    Accepted Solution

    Have you configured a Backup to Disk or Removable Backup to Disk?
    Is it only on the RDX that you get a slow throughput? If yes update the RDX firmware
    If it runs slow on B2D created on a local volume (non RDX) with the same speed you could have the TOE issue
    Backups targeted to a USB removable storage device with 160GB or larger cartridges may fail during verify with "Difference encountered in file data"

    Author Comment

    It is configured as a removable backup to disk.
    We have had the RDX firmware update by our contracted support bods to v. 0044,
    we are now up to 770Mb/minute according to BackupExec.

    I'm running a backup of 7Gb to a local backup-to-disk folder to test your theory.
    What is the TOE issue. Our server's NIC does have TCP offload capabilities
    LVL 23

    Expert Comment

    Turn off the TOE for testing by running the following command on the server


    you will get OK as return

    Run a backup and check the throughput
    If there is an immense improvement you know its  the TOE (TCPIP OFFLOADINF ENGINE) that is causing the problem

    Author Comment

    Is the TOE issue know to affect backup to local disks? This seems an odd side effect of a TOE.

    I will run the test as suggested.

    Author Closing Comment

    The firmware update seems to have given us the biggest speed improvement.

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