database server is down, check for low disk space (23)

We are getting Database server is down, while opening admin console.

nbemmcmd command output

C:\Program Files\Veritas\NetBackup\bin\admincmd>nbemmcmd.exe -getemmserver
NBEMMCMD, Version: 7.6.1
The function returned the following failure status:
database server is down, check for low disk space (23)
Command did not complete successfully.