Low throughput DLT VS 80 with Brightstor Arcserve 11.1

Posted on 2005-04-26
Last Modified: 2010-05-18
I haven problems with my backup. I use HP DLT VS 80 with brightstor arcserve. When i backup 20 Gb data is runs about 40 hours an has a throughput of 6 Mb/m in stead of 6 mb/s. I think the default block size of 512 is to low. Does anybody know where i can change this.
Question by:LSoochit
    LVL 87

    Expert Comment

    How is the DLT connected to the server? Are you using a separate controller or is it the same as your disks are using?
    LVL 22

    Expert Comment

    This problem was addressed in a Tape Engine update.

    Here is the download page
    QO63594        119 MB        01/27/05        NT -BAB R11.1 SERVICE PACK 1 - ENGLISH
    QO66072        10.5 MB        04/04/05        NT -BAB 11.1 DEVICE SUPPORT UPDATE 3
    and should install this
    QO66526        11.8 MB        04/11/05        NT -UNIVERSAL AGENT SECURITY UPDATE

    Author Comment

    It is a different controller where the DLT is connected too

    Author Comment

    If you install SP1 do you need to stop all arcserve serices or only the tape engines
    LVL 22

    Accepted Solution

    All services need to be stopped and there is a chance the system will need to be restarted.

    Here is the registry hack to set the block size.
    HKEY_LOCAL_MACHINE\SOFTWARE\      ComputerAssociates\ARCserveIT\Base\TapeEngine\DEVICE#

    (where DEVICE# corresponds to the tape drive you want to change the block size)

    Highlight DEVICE# select Edit Add Value,
    Value Name: DefaultBlockFactor
    Data Type: REG_DWORD
    click ok,
    Data: 7   <-- Hex

    0 = 512 (default)
    1 = 1,024 (1K)
    2 = 2,048 (2K)
    3 = 4,096 (4K)
    4 = 8,192 (8K)
    5 = 16,384 (16K)
    6 = 32,768 (32K)
    7 = 65,536 (64K)

    Author Comment

    Thx for the hack that did the trick.

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