Forum Discussion

konzept's avatar
konzept
Level 3
13 years ago

LTO5 Tape is not using the complete capacity of 1,5TB (uncompressed) + Compression not working

Hey Guys, I have a strange problem at one of our customers installation. I've installed a SAS attached external HP LTO5 drive with 1,5TB/3TB Cartridges. Backup Exec 12.5. It worked well since a ...
12.x and Earlier
Backup and Recovery
Backup Exec
Backup Exec (media server only)
  • konzept's avatar
    konzept
    13 years ago

    Just wanted to let you know, that I've been able to solve the problem.
    I did some additional tests with the HP Tape Tools and with the "HP Drive Assessment Test" came out that the device could not write the full capacity to the tape.


    HP sent me a new LTO and now it works like it should.
    Compression 1,1:1 - Data on tape 1,0TB.

    Nevertheless, thank you for your time.

    I hope this post helps someone else in the future.

    Regards
    Simon

     

konzept's avatar
konzept
Level 3
13 years ago

I've done yesterday a full erase  of the tape with HP Tape Tools.
The backup now completed and wrote 1,262 TB to the tape (value from job list). 1,15TB data is written in the tape details.

But why is he using 1,4TB on the tape with 1,15TB data? It cannot be a "negative compression" problem, because without compression its the same (as seen above).

I've watched now other installations of our clients and ther the data value is always higher than the used capacity on the tape.

Can someone explain me why this is happening?