The library manager continues to accept commands from the host. The commands
are either performed (immediate non-motion, non-mount commands) or queued
(motion commands) if the 3494 is Online.
The System Summary window contains the operational mode status and displays
Pause Pending from the time that Pause is requested until the time that the
cartridge accessor is stopped. When the cartridge accessor is stopped, the System
Summary window displays Pause.
Use Pause mode when you want to stop all cartridge accessor motion in an orderly
manner (usually to open a front door).
To resume cartridge accessor motion, select Auto from the Mode pull-down menu.
Note: If you are in Pause mode and you want to go to the Offline state, you must
go to either Auto mode or Manual mode. From either of these modes
(selected from the Pause/Offline Pending pop-up window), you can complete
the transition to the Offline state. This process allows the 3494 to handle all
pending host commands before going to the Offline state.
Manual
Use Manual mode when the cartridge accessor is out of service. In Manual mode,
the library manager console displays all mount and eject requests. The display also
shows the cartridge volser, the tape library drive number, and the location of the
cartridge.
When selected, the mode changes from Auto or Pause mode to Manual mode. You
are prompted to confirm the selection. The icon before Manual indicates that
Manual mode was selected. The cartridge accessor is automatically parked in the
home position. The library manager then directs motion commands to the Manual
mode window instead of to the cartridge accessor.
See “Using Manual Mode” on page 227 for a complete description of the Manual
mode operating procedure.
Online
Selecting Online causes the library manager to send a message to all attached
3490E/3590 and Virtual Tape Servers to indicate that the library manager is Online.
If Online is selected and the library manager is already Online, the selection is
ignored and no messages are sent to the attached control units. The pop-up
window indicates Online Pending while the library manager is in the process of
going Online.
You are prompted to confirm the selection. The select button in front of Online
indicates that the Online state was selected.
When the library manager is powered on and after all the initialization code
executes successfully, Auto mode and Online state starts automatically after a
two-minute delay if the user does not intervene. The operator or service personnel
may want to prevent the library manager from automatically going Online and in
Auto mode. A pop-up window is displayed (after the IBM logo panel display times
out) that allows you to press the Enter key and continue directly into Auto mode and
Chapter 6. Advanced Operating Procedures
101
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