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6Library Stacker Mode
If you are familiar with the operations of a tape stacker, you should have no problems
operating the library in stacker mode. The following information covers the basics of
the stacker mode for both the 15-cartridge and 30-cartridge libraries.
Stacker Mode Overview
In tape stacker mode, the library:
• Treats the DCM(s) as a single storage unit
• Reads and writes data using only Drive 1
• First selects cartridges at one end of the DCM and works towards the other end,
requiring careful arrangement of cartridges in the DCM
• Performs different operations as controlled by opening the door for less than two
seconds
Using Drive 1 Only
Only Drive 1 is used in stacker mode. In a library with two tape drives, Drive 2 is
powered on and idle, but unrecognized by the library and host computer. Furthermore,
a drive must always be installed in the location for Drive 1; stacker mode never
recognizes the location for Drive 2.
Thinking Like One Big Data Cartridge
The library stacker treats the DCM as if it were a single storage unit. It performs
cartridge operations beginning with the cartridge in the first slot of the DCM. When the
library stacker is through with a cartridge, it moves the cartridge to the next available
slot in the DCM. The library stacker then grabs the cartridge in the next slot, moves it
to the drive, and continues in this way until the command is complete.
See the diagrams on page 50 for a detailed view of the stacker mode process.