State change of a disk after changeover of a faulty disk

I change physical disk in media server (Linux). I run Inventory disk pool ( with 3 disk  - /backup/sdb /backup/sdc /backup/sdd ) on master server. Then  I run

command in media server:     

nbdevquery -listdv -stype AdvancedDisk -dp ufa_proxy -dv /backup/sdb –U

Disk Pool Name      : ufa_proxy
Disk Type           : AdvancedDisk
Disk Volume Name    : /backup/sdb
Disk Media ID       : @aaabM
Total Capacity (GB) : 916.89
Free Space (GB)     : 916.70
Use%                : 0
Status              : DOWN
Flag                : ReadOnWrite
Flag                : AdminDown
Flag                : InternalDown

I run command:

nbdevconfig -changestate -stype AdvancedDisk -dp ufa_proxy -dv /backup/sdb -state UP

and get message  - successfully changed the state of disk volume.

But next command  nbdevquery -listdv -stype AdvancedDisk -dp ufa_proxy -dv /backup/sdb –U 

show my again that Status  - DOWN, and Flag - Internaldown.

 How to reanimate a disk pool or change disk state to UP?