About 15 minutes before you plan to begin the backup, use the TELL
command to send a message asking all users to finish their work and to log off
the system. Enter the following command substituting the actual time that you
plan to begin the backup for hh:mm.
:TELL @S; BACKUP BEGINS AT hh:mm. PLEASE LOGOFF; &
:TELL YOUR QUIET NEIGHBORS
(A QUIET neighbor is someone who has specified not to be disturbed
with terminal messages.)
NOTE: For an online backup, send this message to everyone
logged on to the system, since users should access files being stored
at the beginning of an online backup.
For a 7x24 true-online backup, this message does not need
to be sent to users. Users can continue to access files throughout
the entire backup. However, you may want to send a message to all
users informing them that a 7x24 true-online backup is starting.