Use the NetBackup nbdevconfig command to merge existing disk pools.
NetBackup updates the catalog records to show the correct location of the backup images in those disk pools.
If the secondary disk pool is referenced by storage units, you must first delete those storage units.
To merge AdvancedDisk disk pools
Change the state of each disk pool to DOWN.
See Changing AdvancedDisk disk pool state.
If backup jobs are assigned to a disk pool, the state change fails. Cancel the backup jobs or wait until the jobs complete.
Merge the disk pools. The following is the command syntax. The primary disk pool is the one you want to retain; nbdevconfig deletes the secondary disk pool after the merge.
install_path\NetBackup\bin\admincmd\nbdev config - mergedps - stype AdvancedDisk -primarydp disk_pool_name-secondarydp disk_pool_name