IBM EXN1000, Hardware And Service Manual, Page: 28 / 94

Terminology
In this and other IBM N series documents, the term filer or storage system
describes IBM N series models that either contain internal disk storage or
attach to the disk storage expansion units specifically designed for the IBM N
series storage systems. There are three disk storage expansion units
specifically designed for the IBM N series:
v IBM EXN4000 fibre-channel disk storage expansion unit
v
IBM EXN2000 fibre-channel disk storage expansion unit
v IBM EXN1000 serial advanced technology attachment (SATA) storage
expansion unit
Note: None of these expansion units are intended to attach to a gateway
system.
This guide uses the following terms:
v Active-Active configuration (sometimes referred to as clustered configuration )
refers to a High Availability system with at least two nodes that share
resources to provide redundancy.
v
AT-FCX refers to the EXN1000 module.
v Device carrier refers to the container that encases a fan/power supply unit
or a disk.
v
Disk applies to any SATA disk encased in its device carrier.
v Disk shelf or expansion unit refers to any shelf or expansion unit containing
hard disk drives.
v
Loop refers to one or more daisy-chained EXN1000 expansion units
connected to an N series storage system.
v
Module refers to the AT-FCX module.
v System and N series storage system refer to the filer, either by itself or with
additional expansion units.
v
SES refers to SCSI Enclosure Services.
Command conventions
You can enter filer commands on the system console or from any client that
can obtain access to a filer using a Telnet session. In examples that illustrate
commands executed on a UNIX
®
workstation, the command syntax and
output might differ, depending on your version of UNIX.
Formatting conventions
The following table lists different character formats used in this guide to set
off special information.
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