DFS3331I DBDUMP ALREADY IN PROGRESS, CANNOT PROCESS GLOBAL COMMAND `seqno`

Explanation
 A /DBDUMP command previously
entered has not yet been completed. Seqno is the
sequence number of the global command that initiated the action.

System action
 The command is ignored.

Operator response
(master terminal)  Wait for the dump command
to be completed, and reenter the command.