22 Library overview
Card cage expansion module
The card cage expansion module (Figure 12) is a 4U chassis that contains 48 permanent LTO slots and
space for additional interface controllers. This module must be located directly below the 8U tape drive
expansion module in a 24U library configuration. The number of usable slots depends on whether it is the
lowest vertically-placed module in the library. If the library floor is attached to this module, the bottom two
rows (containing 16 slots) are blocked and cannot be used.
The front of the chassis has one window for viewing robotic motion inside the library. On the back, six
PCI card slots are available for additional e2400-FC 2G interface controllers to expand the library tape
drive capacity. One interface controller is added for every four additional tape drives. Two redundant
power supplies are located at the bottom of the card cage, and two cooling fans are on the right.
Figure 12 Expansion card cage module
1 Viewing windows
2 Blank facade
3 Card slot
4 Redundant power supplies
5 Fans
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