Add volume to exisiting Advanced Disk Pool

Symantec NBU v.7.5.0.6.  Master server on Windows 2003 Std, media server with disk pool on Linux. Advanced Disk Pool consist of two disk with Volume name:

backup/sdc     raw size  916 GB

backup/sdb     raw size 916 GB

Total raw size  - 1.79 TB

I add  new disk 1 TB  and see in Linux directory backup  (with subdir  'sdc' and 'sdd') new  dir   'sdb'   but on Master server - NO.

Can I increase  DISK POOL with additional new disk  volume 'sdb'  ?

Or I must recreate DISK POOL ?