Forum Discussion

LubosDvorak's avatar
LubosDvorak
Level 4
4 years ago

Many tape dismounts during single duplication job

I am using bpduplicate for regular image duplication to tape. There are about 400 images duplicated by one bpduplicate command. All images are duplicated to one LTO tape.

I expect there will be one mount and one dismout during the duplication. But the tape is dismounted and mounted about 14 times during single duplication. I want to eliminate these repetitive dismounts/mounts because they are causing job runtime prolongation and excessive drive and tape wear.

Has anyone solved it?

 

8.2
Linux
  • LubosDvorak's avatar
    LubosDvorak
    4 years ago

    Support technician provided the solution:

    Checked any allocations for the tape drives using nbrbutil -dump command
    Found allocations and we have cleared the allocations using nbrbutil -resetall
    Drive cleaning has been performed from the library end.
    Cleared the cleaning comments using https://www.veritas.com/support/en_US/article.100046625
    Ran the duplication job and unmount operation is working as expected now

    RESOLUTION SUMMARY:
    After clearing the allocations and performing the drive cleaning, the unmount operations was working as expected.

  • Nicolai's avatar
    Nicolai
    Moderator
    4 years ago

    Hi LubosDvorak 

    In order to understand the mount/dismount, you will have to figure out what causes the tape to be dismounted in the first place. There must be a reason what Netbackup think the tape needs to be dismounted. Netbackup is by default lazy and won't dismount unless there is a reason. Same reason Netbackup may choose to continue with backup jobs of lower priority, because higher priority jobs requires change of tape. 

    Is the data source disk ?

    Is the destination retention and volume group the same ?

    How do you start the bpduplicate command - one command or multiple commands ?