Forum Discussion

Chan_backup's avatar
8 years ago

Oracle with windows backup failing with ORA-27211: Failed to load Media Management Library


Master : Linux / Media - Windows (NBU

Client: windows 2008 R2 64 bit (NBU

Backup fails with below error, schedule from window scheduler/client not from netbackup.

no jobs generated at the netbackup activity monitor.

RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03009: failure of allocate command on t1 channel at 11/10/2016 18:08:00
ORA-19554: error allocating device, device type: SBT_TAPE, device name:
ORA-27211: Failed to load Media Management Library

I know how to resolve the issue in Unix server but windows its bit tricky.

what is library file for windows?

where it is located?

how to do linking in windows?

after googling i found this file orasbt.dll, please confirm is this the lib file integrated with netbackup?

i put the file in netbackup/bin directory and restarted the nbu services also reinstalled the software, nothing worked.

What could be issue.

any help would be highly appreciated.


  • Michael_G_Ander's avatar
    8 years ago

    Have seen this when installing/upgrading Netbackup and not rebooting after on some Windows machines.

    Some times the problem can be fixed by copying the orasbt.dll directly into system32

    Sorry been a while, so can't remember where it is located originally

10 Replies

  • I had observed this error if you install 32bit Oracle on 64bit Windows ? Is that the same case with you ? If yes, then please note that its not supported, perhaps you must install 64bit Oracle.

      • PatS729's avatar
        Level 5

        NBU for Windows installs the database plugin as a .dll. The only requirement for Oracle on Windows to use the NBU library is a restart of Oracle Services so that RMAN will use the NBU library/dll.

        Hope it helps.

  • You say that " Backup fails with ... window scheduler/client not from netbackup."

    Does this mean that the backup works when scheduled from NetBackup?

    Are you using custom RMAN script or one of the sample scripts provided with NBU client installation?