Forum Discussion

Intore's avatar
Intore
Level 4
6 years ago

wrong media server used to perform the duplication

Hi all, I need your help because after creating a Storage Unit Group for the backup and a Storage Unit Group for the duplication, sometimes the duplication jobs use a media server that is not config...
8.1.2
windows server 2012
  • Intore's avatar
    Intore
    6 years ago

    Hi all,

    the support explained me the behavior of the duplication job with the STUG:

    As you are using storage unit groups for the target of the duplication, this will mean (as per the NetBackup OST Disk Admin Guide), that Optimized duplication is not supported and therefore the duplication will go via the network.  In this scenario both the media server which is performing the read operation and the media server performing the write operation will need to communicate on port 1556.

    I hope this could help someone.

    Thank you

    Intore

RiaanBadenhorst's avatar
RiaanBadenhorst
Level 6
6 years ago

Please post the full config. What is the source, what is target (tape, disk, etc)

It is common in OST configuration for media servers that shouldn't perform duplications picking up the jobs because they have permissions for the storage server, but they didn't do the backup. 

  • Intore's avatar
    Intore
    Level 4
    6 years ago

    Hi Riaan,

    the duplication is performed between two storage units in two differents DataDomain.

    I just opened a case in Veritas.

    • Marianne's avatar
      Marianne
      Level 6
      6 years ago

      Intore 

      If you look to the right under 'Related discussions ' you will see that this is a 'known issue'.
      Veritas do not see this as a problem - rather that is working by design due to a built-in 'load balancing logic'. 

      There used to be a TN where this behaviour is explained and how to fix it with  USE_BACKUP_MEDIA_SERVER_FOR_RESTORE touch file. 
      No idea why Symantec/Veritas removed the TN.

      RamNagalla posted the contents of that TN over here: https://vox.veritas.com/t5/NetBackup/How-to-use-Media-Host-Override/m-p/599562#M150195

      The touch-file on the master should fix your issue. 

      • Intore's avatar
        Intore
        Level 4
        6 years ago

        Marianne, RiaanBadenhorst 

        thanks for replying.

        Hi read the document and I found this sentence:

        ...But for reads - for example, restores or the read side of a duplication - the set of media servers from which NetBackup will choose will come from the list of media servers credentialed for the storage server.

        In my case, sometimes, Netbackup chooses some media server that are not listed in the media servers credentialed for the storage server. I opened the case for this reason and the support is analying the logs.

        I'll let you know.

        Thanks again

        Intore