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Chapter 1. Introduction
This chapter describes the operating specifications, features, and components for
the IBM TotalStorage DS4500 Storage Subsystem (hereafter referred to as DS4500
or storage subsystem).
This chapter also includes an inventory checklist and important information on best
practices guidelines and product updates for your DS4500.
Overview
IBM DS4000 solutions support the large and growing data storage requirements of
business-critical applications. These scalable IBM DS4000 solutions offer you data
access and protection to meet your existing enterprise storage requirements and
prepare for the future.
The DS4500 Storage Subsystem (Machine type 1742, models 90U and 90X)
supports direct attachment of up to four hosts that contain two host adapters each,
and is designed to provide maximum host-side and drive-side redundancy. By using
external Fibre Channel switches in conjunction with the DS4500, you can attach up
to 64 hosts with two adapters each to a DS4500 Storage Subsystem.
Each DS4500 Storage Subsystem contains several removable components, called
customer replaceable units (CRUs), that you can access from either the front or
back of the unit. These CRUs include the battery unit, RAID controllers, storage
subsystem fan, power supplies, fan and communications module, and mini hubs.
The DS4500 Storage Subsystem also has a removable front bezel.
The DS4500 Storage Subsystem functions with at least one external storage
expansion enclosure containing Fibre Channel (FC) or Serial Advanced Technology
Attachment (SATA) hard drives. The DS4500 Storage Subsystem supports a
maximum of 224 hard drives when the drives are configured using IBM DS4000
EXP700, DS4000 EXP710, DS4000 EXP100, or DS4000 EXP810 storage
expansion enclosures. If the drives are configured using IBM FAStT EXP500
storage expansion enclosures only, a maximum of 220 hard drives are supported.
© Copyright IBM Corp. 2006 1