Forum Discussion

Markus_Bonet's avatar
Markus_Bonet
Level 3
11 years ago

Duplication jobs are stuck at "Waiting for positioning of media id"

We have an NetBackup 7.5.0.6 environment running on an RHEL5 Master Server and two RHEL5 Media Servers.

Each server has access to all 16 LTO4 tape drives connected via two different libraries.

On a regular basis I can encounter duplication jobs which seem to be stuck.

All resources have been granted and a proper tape has been mounted.

The file list contains the first image which should be duplicated in this batch and NetBackup claims that it's waiting for positioning the media.

This can take take hours until finally the duplication process starts and then proceeds at expected speed (350 GiB/h) with multiple images in the batch.

I know that positioning is not an issue as the same media and drives are used for B2T jobs which never show such behavior.

 

Did anybody encounter something like this?

Any hint where to look and what to check?

 

Thanks

Markus

7.5
Advanced Disk-Based Backup Option
Backup and Recovery
Linux
NetBackup
  • Mark_Solutions's avatar
    Mark_Solutions
    Level 6
    11 years ago

    Really not sure what is causing it - it may be hardware or it may be a resource issue (nbrb on the Master or paged memory on the media servers)

    You probably need to raise a case with Symantec and up the logging levels to try and find out what is actually happening during the 2 hour gaps - maybe each media server having 16 drives is just too much .. bear in mind that when you write straight to tape it has half the buffering processes that it will have when duplicating from disk to tape

  • Markus_Bonet's avatar
    Markus_Bonet
    Level 3
    11 years ago

    For now, we have to live with the situation.

    The server hardware is being replaced in the near future, so I will re-check the situation as soon we are on RHEL6 and new hardware.