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Chapter 4: Operation
OCP Rules
OCP commands obey the following basic rules:
1) Any operational conflict between commands received from the host interface or RMU and
th
ose entered via the front panel will be avoided with a reservation mechanism on a
'first-come, first-served' basis.
Any reservation by OCP is cancelled by an OCP logout or timeout, which cancels the User
Int
eraction Mode.
2) The library firmware will not allow a user to select an impossible request. Those situations
include, but are
not limited to:
• Moving a tape cartridge from any source to a full magazine slot
• Moving a tape cartridge from an empty magazine
slot
• Loading a tape cartridge from any so
urce to a full tape drive
• Unloading a tape cartridge from an empty tape drive
3) Any error detected by the library or drive controller and not recoverable through predeter-
mined firmware algorithms will be considered as fatal. An error code displays on the OCP
an
d the error LED illuminates. The error code remains on the OCP until a button is pressed,
which causes the OCP to return to the home screen.
4) Numeric error codes are only used for unrecoverable, fatal errors (see "Main Error Codes" on
page 89), otherwise text status messages are provided.
Power-Up Display
When the library powers up or resets, it goes through internal processes that initialize and prepare
the unit for normal operation. These processes are called Power-On-Self-Test (POST). While the
POST is in process, the OCP will display appropriate information to keep the user informed. When
the library finishes POST, it displays the current library status for a defined time or until a front panel
key is pressed.
After this initial status screen, the
home screen will be displayed until any key is pressed. The home
screen shows the overall health of the library, indicating the status of the media changer and the
connected drives.
LEDs
All LEDs are updated during power up and reset sequences. Upon power up or software reset, the
library illuminates all LEDs at some point during the POST process. This helps the user to verify
whether all LEDs are functional. When initialization starts, all LEDs are extinguished and the
ready/activity LED flashes at approximately two-second intervals. When the mechanical
initialization is complete, the ready/activity LED stops flashing and remains constantly illuminated.
If a library failure occurs, the ready/activity LED is turned off and the error LED illumina
ted. The OCP
also displays a specific error code to help identify the failure.
The following are additional operational details regarding the LEDs:
• The <Ready/Activity> LED illuminates any time the unit is powered
on and functional (i.e.
successfully completed the POST). The LED blinks whenever there is any tape library or drive
activity. The LED also blinks when the unit is offline.
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