Red Hat GLOBAL FILE SYSTEM 5.2 Manuale utente

Global File System

Red Hat Global File

System

5.2

Global_File_System

ISBN: N/A

Publication date: May 2008

This book provides information about installing, configuring, and maintaining Red Hat GFS (Red

Hat Global File System) for Red Hat Enterprise Linux 5.2.

Global File System

Global File System: Red Hat Global File System

Open Publication License, V1.0 or later with the restrictions noted below (the latest version of the OPL is presently

available at http://www.opencontent.org/openpub/).

Distribution of substantively modified versions of this document is prohibited without the explicit permission of the

Distribution of the work or derivative of the work in any standard (paper) book form for commercial purposes is

prohibited unless prior permission is obtained from the copyright holder.

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Global File System

Introduction ..............................................................................................................vii

1. Audience ...................................................................................................... vii

2. Related Documentation ................................................................................. vii

3. Document Conventions ................................................................................ viii

4. Feedback ......................................................................................................ix

1. GFS Overview ....................................................................................................... 1

1. New and Changed Features ........................................................................... 2

2. Performance, Scalability, and Economy ........................................................... 2

2.1. Superior Performance and Scalability ................................................... 2

2.2. Economy and Performance .................................................................. 3

3. GFS Software Components ............................................................................ 5

4. Before Setting Up GFS ................................................................................... 6

2. Getting Started ...................................................................................................... 7

1. Prerequisite Tasks ......................................................................................... 7

2. Initial Setup Tasks .......................................................................................... 7

3. Managing GFS ...................................................................................................... 9

1. Creating a File System ................................................................................... 9

2. Mounting a File System .................................................................................13

3. Unmounting a File System .............................................................................16

4. Displaying GFS Tunable Parameters ..............................................................16

5. GFS Quota Management ...............................................................................18

5.1. Setting Quotas ...................................................................................18

5.2. Displaying Quota Limits and Usage .....................................................19

5.3. Synchronizing Quotas ........................................................................21

5.4. Disabling/Enabling Quota Enforcement ................................................22

5.5. Disabling/Enabling Quota Accounting ..................................................23

6. Growing a File System ..................................................................................25

7. Adding Journals to a File System ...................................................................27

8. Direct I/O ......................................................................................................29

8.1. O_DIRECT ...........................................................................................30

8.2. GFS File Attribute ...............................................................................30

8.3. GFS Directory Attribute .......................................................................31

9. Data Journaling .............................................................................................32

10. Configuring atime Updates ..........................................................................33

10.1. Mount with noatime ..........................................................................34

10.2. Tune GFS atime Quantum ...............................................................35

11. Suspending Activity on a File System ...........................................................35

12. Displaying Extended GFS Information and Statistics ......................................36

12.1. Displaying GFS Space Usage ...........................................................36

12.2. Displaying GFS Counters ..................................................................37

12.3. Displaying Extended Status ..............................................................40

13. Repairing a File System ...............................................................................42

14. Context-Dependent Path Names ..................................................................44

Index .......................................................................................................................47

Introduction

The Global File System Configuration and Administration document provides information about

installing, configuring, and maintaining Red Hat GFS (Red Hat Global File System). A GFS file

system can be implemented in a standalone system or as part of a cluster configuration. For

information about Red Hat Cluster Suite refer to Red Hat Cluster Suite Overview and

Configuring and Managing a Red Hat Cluster.

HTML and PDF versions of all the official Red Hat Enterprise Linux manuals and release notes

are available online at http://www.redhat.com/docs/.

1. Audience

This book is intended primarily for Linux system administrators who are familiar with the

following activities:

• Linux system administration procedures, including kernel configuration

• Installation and configuration of shared storage networks, such as Fibre Channel SANs

2. Related Documentation

For more information about using Red Hat Enterprise Linux, refer to the following resources:

•Red Hat Enterprise Linux Installation Guide — Provides information regarding installation of

Red Hat Enterprise Linux 5.

•Red Hat Enterprise Linux Deployment Guide — Provides information regarding the

deployment, configuration and administration of Red Hat Enterprise Linux 5.

For more information about Red Hat Cluster Suite for Red Hat Enterprise Linux 5, refer to the

following resources:

•Red Hat Cluster Suite Overview — Provides a high level overview of the Red Hat Cluster

Suite.

•Configuring and Managing a Red Hat Cluster — Provides information about installing,

configuring and managing Red Hat Cluster components.

•LVM Administrator's Guide: Configuration and Administration — Provides a description of the

Logical Volume Manager (LVM), including information on running LVM in a clustered

environment.

•Using Device-Mapper Multipath — Provides information about using the Device-Mapper

Multipath feature of Red Hat Enterprise Linux 5.

vii

•Using GNBD with Global File System — Provides an overview on using Global Network Block

Device (GNBD) with Red Hat GFS.

•Linux Virtual Server Administration — Provides information on configuring high-performance

systems and services with the Linux Virtual Server (LVS).

•Red Hat Cluster Suite Release Notes — Provides information about the current release of

Red Hat Cluster Suite.

Red Hat Cluster Suite documentation and other Red Hat documents are available in HTML,

PDF, and RPM versions on the Red Hat Enterprise Linux Documentation CD and online at

http://www.redhat.com/docs/.

3. Document Conventions

Certain words in this manual are represented in different fonts, styles, and weights. This

highlighting indicates that the word is part of a specific category. The categories include the

following:

Courier font

Courier font represents commands,file names and paths, and prompts .

When shown as below, it indicates computer output:

Desktop about.html logs paulwesterberg.png

Mail backupfiles mail reports

bold Courier font

Bold Courier font represents text that you are to type, such as: service jonas start

If you have to run a command as root, the root prompt (#) precedes the command:

#gconftool-2

italic Courier font

Italic Courier font represents a variable, such as an installation directory:

install_dir/bin/

bold font

Bold font represents application programs and text found on a graphical interface.

When shown like this: OK , it indicates a button on a graphical application interface.

Introduction

viii

Additionally, the manual uses different strategies to draw your attention to pieces of information.

In order of how critical the information is to you, these items are marked as follows:

Note

A note is typically information that you need to understand the behavior of the

system.

Tip

A tip is typically an alternative way of performing a task.

Important

Important information is necessary, but possibly unexpected, such as a

configuration change that will not persist after a reboot.

Caution

A caution indicates an act that would violate your support agreement, such as

recompiling the kernel.

Warning

A warning indicates potential data loss, as may happen when tuning hardware

for maximum performance.

4. Feedback

If you spot a typo, or if you have thought of a way to make this manual better, we would love to

hear from you. Please submit a report in Bugzilla (http://bugzilla.redhat.com/bugzilla/) against

the component rh-cs.

Be sure to mention the manual's identifier:

Feedback

Bugzilla component: Documentation-cluster

Book identifier: Global_File_System(EN)-5.2 (2008-05-21T15:10)

By mentioning this manual's identifier, we know exactly which version of the guide you have.

If you have a suggestion for improving the documentation, try to be as specific as possible. If

you have found an error, please include the section number and some of the surrounding text

so we can find it easily.

Introduction

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