IBM Enterprise Storage Server 2105 E10, Introduction And Planning Manual

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Chapter 1. Introduction
This book provides an overview of the IBM Enterprise Storage Server (ESS) and
lists the features that you can order. It also provides guidelines for these tasks:
v
Installation planning
v
Communications planning
v
Data migration planning
For guidelines and work sheets for logical configuration, see the
IBM Enterprise
Storage Server Configuration Planner
on the product Web site:
http://www.storage.ibm.com/hardsoft/products/ess/refinfo.htm
IBM Enterprise Storage Server overview
This section provides an overview of the IBM Enterprise Storage Server (ESS) and
describes its interfaces and components.
The ESS is a member of the Seascape family of storage servers. The ESS
provides integrated caching and support for redundant arrays of independent disks
(RAID) for the disk drive modules (DDMs). The DDMs are attached through a serial
storage architecture (SSA) interface.
The ESS uses peripheral component interconnect (PCI) architecture that is
designed to provide high availability and to avoid single points of failure.
The ESS Models E10 and E20 provide 6 GB of cache. The ESS Models F10 and
F20 provide 8 GB of cache; an optional 16 GB of cache; and faster PCI
architecture.
The ESS provides the following features:
v
RAID 5 or non-RAID disk groups
v
Fast SSA drives
v
Fast reduced instruction-set computer (RISC) processors
v
A fault-tolerant system
v
Sharing of storage between open-systems hosts
v
OS/390
®
parallel input/output (I/O) interface
v
Instant copy solutions
v
Disaster recovery solutions
Models E20 and F20, with expansion enclosures, can provide up to 11 terabytes
(TB) of storage capacity, with a choice of 9.1, 18.2, or 36.4 GB DDMs. When IBM
refers to DDM capacity, TB means 1 000 000 000 000 bytes. For processor
storage, real and virtual, a TB equals 2
⁴⁰
or 1 099 511 627 766 bytes. Total
user-accessible capacity may vary depending on the operating environment.
See Figure 1 on page 2 and Figure 2 on page 2 for illustrations of the ESS models
and the expansion enclosure. ESS Models E10 and F10 do not support an
expansion enclosure.
© Copyright IBM Corp. 1999, 2000
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