Forum Discussion

john10's avatar
john10
Level 6
10 years ago

Data storing issue on Tapes

Hi All, We are using NetBackup 7.0.1 and Dell TL4000 Tape Library for Backup's. Here the problem is our Tapes are showing the status full only after writing around 1.45 to 1.5 TB in LTO5 Tapes(acc...
7.1.x and Earlier
Backup and Recovery
NetBackup
Windows Server (2003-2008)
  • mph999's avatar
    mph999
    10 years ago

    Do not enable compression, this is done by the tape drive itself.

    NBU does not mark the tape full by itself, what happens is that the tape drive detects the end of the tape, and sends a signal via the tape driver to NBU.  THen NBU marks the tape full.

    So, if the tape is marked full 'early' either the data you are sending to it is not compressable (not all data can be compressed) - so this would be normal and there is no issue.

    The other cause, if the data is compressable and the tape is marked full early, is that there is either a fault with the hardware (tape drive) itself, or there is a firmware of driver issue.

    There is no way to control when a tape is marked full from within NetBackup.

mph999's avatar
mph999
Level 6
10 years ago

Do not enable compression, this is done by the tape drive itself.

NBU does not mark the tape full by itself, what happens is that the tape drive detects the end of the tape, and sends a signal via the tape driver to NBU.  THen NBU marks the tape full.

So, if the tape is marked full 'early' either the data you are sending to it is not compressable (not all data can be compressed) - so this would be normal and there is no issue.

The other cause, if the data is compressable and the tape is marked full early, is that there is either a fault with the hardware (tape drive) itself, or there is a firmware of driver issue.

There is no way to control when a tape is marked full from within NetBackup.