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Library Complex
96154 • Revision K Chapter 1 Introduction 19
■ The system PDU, connected directly to the branch circuit, provides AC power to
three DC power grids and the electronics control module.
■ The N+1 PDU supplies added +48 VDC load sharing power to each of the three DC
power grids and an extra AC-to-DC power supply for the electronics control
module.
The base power configuration provides power to the:
■ Tape drive power supplies
■ Robotic rail power supplies
■ Customer Interface Module power supplies
■ Touch screen operator control panel
■ Electronics control module power supplies
Note – The base power configuration does not offer redundant AC power.
2N Power Configuration
The 2N power configuration contains the base power configuration (PDU 1) and a
second PDU, PDU number 2.
This configuration provides power to the same components as N+1, plus power for:
■ Optional, redundant load sharing power supplies
■ Two additional accessory racks for customer components
■ Redundant controller cards
Note – The 2N PDU is required for the 2N drive power, 2N robotic power, and also for
the additional rack installed.
Library Complex
A library complex is created by connecting two or more SL8500 libraries together with
Pass-thru Ports (PTPs).
The maximum size library complex possible consists of either:
■ 32 libraries for Host Software Component (HSC) systems, connected through PTPs,
containing over 320,000 cartridge slots and 2,048 tape drives.
■ 31 libraries for Automated Cartridge System Library Software (ACSLS) connection,
connected through PTPs, containing over 320,000 cartridge slots and 1,984 tape
drives.
Note – A library complex with functional pass-thru ports (PTPs) cannot be partitioned.
All PTPs must be disabled before partitioning can be enabled. See “Library
Partitioning” on page 22 for details.