Chapter 1 - Introduction; Modules - Overland Data DLT LibraryXpress Series Service Manual

Chapter 1 - Introduction

The DLT LibraryXpress™ System is an expandable, modular tape library system combining
DLT drive technology with advanced robotics. The LibraryXpress System is designed for
high duty-cycle on-line and near-on-line applications, such as hierarchical storage
management (HSM). It is a superior performer in high-volume backup and archival service as
well.

Modules

Available modules in the LibraryXpress series are the following.
•
Global Control Module (LXG)
•
Base Module (LXB)
•
Capacity Module (LXC)
Every DLT LibraryXpress System consists of one Global Control Module, and any
combination of up to eight of the remaining modules stacked in a rack. The Global Control
Module can move media freely between itself, Base Modules, and Capacity Modules via the
robotically-controlled XpressChannel™.
In a DLT LibraryXpress System, you can combine modules to provide the right combination
of capacity and performance to meet your present requirements. Overland Data's SmartScale
Storage™ architecture lets you change or add to the mix of modules to optimize throughput,
capacity, or both as your needs change.
When connected as a system, the robotics in Base Modules and Capacity Modules act as
commanded by the Global Control Module. The host computer or computers need no
knowledge of the internal geometry of the system, or of the actions or capabilities of any of
the slave modules. The Global Control Module presents to the host or hosts a single SCSI
medium changer device with a single SCSI Medium Transport element, a number of SCSI
Storage elements equal to the total number of cartridge magazine slots, a number of SCSI
Import/Export elements as specified by the user during configuration of the Global Control
Module, and a number of SCSI Data Transfer elements equal to the total number of drives in
the system.
Chapter 1 - Introduction 1