To set up the OST connector on multiple NetBackup media servers in the same domain, additional steps must be taken on each NetBackup media server before adding the storage pools in NetBackup.
To set up multiple NetBackup media servers in the same domain
/etc/sdfs/ostconfig.xml
and change the <name> tag to something unique in the NetBackup domain, such as the host name with an incremented number, for example:<NAME>hostname-0</NAME>
See Creating an OST disk pool and STU in the NetBackup console.