Preface

About this guide

This guide describes how to connect, manage, and troubleshoot a NetApp® FAS250, FAS270, or FAS270c storage system. For information about installation and setup, see the Quick Start Instructions that came with your system.

Audience

This guide is for qualified system administrators and service personnel who are familiar with Network Appliance^TM storage systems and/or NetCache^TM appliances.

Terminology

This guide uses the following terms:

Appliance refers to those NetApp filers, NetCache appliances, and Fibre-Attached Storage (FAS) appliances that support the disk shelves.
CPU module refers to the storage appliance module that oversees the data input/output between the disk drives. The CPU modules are at the rear-center of the appliance.
Device carrier refers to the container that encases a fan/power supply unit or a disk.
Disk applies to any Fibre Channel disk encased in its device carrier.
Disk shelf refers to any Fibre Channel disk shelf model.
ESH (Embedded Switching Hub) module refers to a device that provides a means of managing an FC-AL loop in an intelligent manner, such that a single drive failure does not take down the loop. It also contains the enclosure services processor, which communicates the environmental data of the disk shelf. ESH modules are not used with FAS200 series systems, but ESH2 modules are used.
ESH2 module refers to a second-generation ESH module. These modules have an auto-terminate sensing function, and therefore do not have terminate switches.
Loop refers to one or more daisy-chained disk shelves connected to a storage appliance.
LRC (Loop Resiliency Circuit) module refers to a device that keeps the FC-AL loop intact during the addition and removal of disks within a disk shelf. It also contains the enclosure services processor, which communicates the environmental data of the disk shelf. The LRC reconditions the signal so that there is no accumulated error in the data signals. As the signal moves, waveforms might distort slightly. Over many hops these distortions would otherwise accumulate, causing high error rates. The LRC prevents this.
Multiloop appliance refers to a storage appliance with more than one FC-AL adapter connected to disk shelves.
Node refers to a CPU module when used in a clustered configuration.
Storage appliance refers to those NetApp filers, NetCache appliances, and Fibre-Attached Storage (FAS) appliances that support the disk shelves.
System and storage system refer to those NetApp filers, NetCache appliances, and Fibre-Attached Storage (FAS) appliances, either by themselves or with additional disk shelves.
Terminate refers to the process of closing a loop on an LRC or ESH module by activating a termination switch on the last disk shelf in the loop. The termination switch replaces the Output terminators and the auto-termination mechanism in previous versions of Fibre Channel disk shelves.

Command conventions

You can enter commands on the system console or from any client that can obtain access to the appliance 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.

Formatting convention	Type of information
Italic type	Words or characters that require special attention. Placeholders for information you must supply. For example, if the guide requires you to enter the `fctest` adaptername command, you enter the characters "fctest" followed by the actual name of the adapter. Book titles in cross-references.
`Monospaced` font	Command and daemon names. Information displayed on the system console or other computer monitors. The contents of files.
`Bold monospaced` font	Words or characters you type. What you type is always shown in lowercase letters, unless your program is case-sensitive and uppercase letters are necessary for it to work properly.

Keyboard conventions

This guide uses capitalization and some abbreviations to refer to the keys on the keyboard. The keys on your keyboard might not be labeled exactly as they are in this guide.

What is in this guide...	What it means...
hyphen (-)	Used to separate individual keys. For example, Ctrl-D means holding down the Ctrl key while pressing the D key.
Enter	Used to refer to the key that generates a carriage return, although the key is named Return on some keyboards.
type	Used to mean pressing one or more keys on the keyboard.
enter	Used to mean pressing one or more keys and then pressing the Enter key.

Special messages

This guide contains special messages that are described as follows:

Note
A note contains important information that helps you install or operate the system efficiently.

Caution
A caution contains instructions that you must follow to avoid damage to the equipment, a system crash, or loss of data.

WARNING
A warning contains instructions that you must follow to avoid personal injury.