HP EML E-series Tape Libraries - Manual (Page 41)

Center-door interlock
The center door on the front of the library cannot be opened until a password-protected command to
unlock the center door is selected on the OCP. This command parks the robot, and actuates a lever that
allows you to open the center door. Even if the unit is powered off, the robot must be parked before
you can open the center door. If the robot is not parked prior to removing power, you cannot readily
open the center door.
Doing an inventory
The library does an inventory at three different times:
• When you turn on the power to the library
• When you reboot the library (Operations > Reboot Library)
• When you open and close the center door of the library (Operations > Unlock Door)
During the inventory:
• The library robotics controller applies voltage to the motors (picker, reach, wrist, and lift drive) to
obtain each motor’s range of motion.
• The range of motion of the robot is tested.
• The targets and labels are read for calibration purposes.
• The bar code scanner looks at each slot to see if it contains a tape. The library robotics controller
stores this information.
You must configure the library to use or not use bar code labels (Configuration > Library
Configuration > Configure Inventory Mode). If bar code labels are not used, the inventory time
may take as long as an hour, and a tape cartridge in a slot is only known to the library as
being full.
Attaching bar code labels to tape cartridges
Attaching bar code labels enables the library and application software to identify the tape cartridge
quickly, thereby speeding up inventory time. When a bar code label is not used, the library simply
designates that tape slot as being full. Even though the library functions without bar code labels, HP
recommends that you use them on your tape cartridges. Your host software can use bar code labels to
track the following information:
• Date of format or initialization
• Media pool of tape
• Data residing on the tape
• Age of the backup
• Errors encountered while using the tape (to determine if the tape is faulty)
CAUTION:
Handle tape cartridges with care. Do not drop or mishandle them, or place them near sources of
electromagnetic interference. Rough handling can damage the tape cartridge making it unusable and
potentially hazardous to the tape drives.
Enterprise Modular Library E-Series 41