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Viking698's avatar
Viking698
Level 3
15 years ago
Solved

Slow backups

Ok running backup exec 2010. using a scalar 24 tape library. Was using LTO1 tape for the backup. Switch(finally) to LTO2 tape for the backup. What I'm getting is the backup went from 1,300MB/minute to 149MB/minute.

Anyone ever seen this? Has me stumped.

Viking

  • Ok manage to update all the tape drive drivers with no effect same problem as before.

    I did retest my old lto1 tapes and once again they work perfect. After much testing it does appear I have a bad batch of tapes. It was one of the only things I did not even think about.

    Viking

  • It would also depend on what you are backing up. If remote backup, it would depend on network.

    Thanks

  • Frm the poperties page for the new drive, verify that both Single Block options are DISABLED.   what are the other settings? 

  • No it is not a remote backup. The tape library is connect to the computer via scsi cable.

    The drive is not new, the only thing that has changed is the tapes. Config is as follows

    Enable compression = check

    Block size = 64k

    Buffer size = 64k

    Buffer count = 10

    High water count = 0

     

    Read single block mode = unchecked

    Write single block mode = unchecked(was checked)

    Read scsi pass through mode = unchecked

    Write scsi pass through mode = checked

    Still has me going huh.

     

    Thanks for all your help.

    Viking

  • The drive is not new, the only thing that has changed is the tapes

     

    Ok, that makes it even more strange.   Everything looks good you might want to increase the buffer size to 128 or 265 if you have plenty of RAM on this system, but that won't make a huge difference

  • Hi Viking,


    When you replaced the drive did you perhaps consider updating your drivers for BE 12.x, and then install them using the Device Configuration Wizard from within BE?

    It IS possible that BE isn't fully utilising the better speed of LTO2. That said, I trust you aren't writing to LTO1 tapes...?

     

    Thanks!

  • Did you replace the drive or just the tapes used in the drive?

    As if just the tapes I would suspect a compatibility issue between the tapes and the drive.

  • I thanks all for the replies.

    I have yet to go back and test the LTO1 drives. I will be doing this on monday to see what happens.

    Yes I just changed the tapes nothing else. That is why it is driving me nuts.

    I will try to reconfigure the tape drives and see what happens over the weekend.

    Ok thanks all

     

    Viking

  • Ok manage to update all the tape drive drivers with no effect same problem as before.

    I did retest my old lto1 tapes and once again they work perfect. After much testing it does appear I have a bad batch of tapes. It was one of the only things I did not even think about.

    Viking