Cartridge Expansion Module; Configuration Options; Parking Expansion Module - Oracle StorageTek SL3000 System Assurance Manual

Library Modules
Power distribution unit
4.

Cartridge Expansion Module

The CEM provides additional cartridge storage. There are no tape drives present
within this module. CEMs on the end of the library can be converted to PEMs (see

"Parking Expansion Module"

in a single library. The initial CEM should be installed to the right of a Base module,
then a second to the left of the DEM/Base module, a third to the right, and the fourth
one to the left, and so on. This alternating method maximizes library performance.

Configuration Options

The physical capacity varies from 438 to 620 cartridge slots (see
Configuration options include:
CAP (optional)
■
Placement to the left or right of a Base module and DEM
■
A maximum of four CEMs on each side of centerline (eight total)
■

Parking Expansion Module

The PEM is a converted CEM used in a redundant robotics configuration. The library
uses the PEM to "park" a defective robot without blocking access for the operational
robot. Performing maintenance on a disabled robot in a PEM is disruptive to library
operations. The parking space causes six columns of cartridge arrays in the PEM to
become inaccessible (three on the front wall and three on the rear wall). You do not
need to remove the inaccessible arrays. The module can be restored to a CEM at
anytime.
Configuration Options
The physical capacity varies from 230 to 312 cartridge slots depending on the
configuration (see
the library. Only the left PEM can have an optional CAP.
Figure 2–4 Parking Expansion Module
2-4 StorageTek SL3000 Systems Assurance Guide
on page 2-4). A maximum of eight CEMs are supported
Chapter 4, "Capacity"). One PEM must be installed on each end of
Chapter 4, "Capacity").