Red_Hat_Enterprise_Linux-6-Global_File_System_2-en-US.pdf

Red Hat Enterprise Linux 6

Global File System 2

Red Hat Global File System 2

Global File System 2

Red Hat Enterprise Linux 6 Global File System 2

Red Hat Global File System 2

Edition 7

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This book provides information about configuring and maintaining Red Hat GFS2 (Red Hat Global File

System 2) for Red Hat Enterprise Linux 6.

Introduction v

1. Audience ........................................................................................................................ v

2. Related Documentation ................................................................................................... v

3. We Need Feedback! ....................................................................................................... v

4. Document Conventions ................................................................................................... vi

4.1. Typographic Conventions ..................................................................................... vi

4.2. Pull-quote Conventions ........................................................................................ vii

4.3. Notes and Warnings ........................................................................................... viii

1. GFS2 Overview 1

1.1. New and Changed Features ......................................................................................... 2

1.1.1. New and Changed Features for Red Hat Enterprise Linux 6.0 .............................. 2

1.1.2. New and Changed Features for Red Hat Enterprise Linux 6.1 .............................. 2

1.1.3. New and Changed Features for Red Hat Enterprise Linux 6.2 .............................. 3

1.2. Before Setting Up GFS2 ............................................................................................... 3

1.3. Differences between GFS and GFS2 ............................................................................. 4

1.3.1. GFS2 Command Names .................................................................................... 4

1.3.2. Additional Differences Between GFS and GFS2 .................................................. 5

1.3.3. GFS2 Performance Improvements ...................................................................... 6

1.4. GFS2 Node Locking ..................................................................................................... 7

1.4.1. Performance Tuning With GFS2 ......................................................................... 8

1.4.2. Troubleshooting GFS2 Performance with the GFS2 Lock Dump ............................ 9

2. Getting Started 13

2.1. Prerequisite Tasks ...................................................................................................... 13

2.2. Initial Setup Tasks ...................................................................................................... 13

2.3. Deploying a GFS2 Cluster .......................................................................................... 14

3. Managing GFS2 15

3.1. Making a File System ................................................................................................. 15

3.2. Mounting a File System .............................................................................................. 18

3.3. Unmounting a File System .......................................................................................... 22

3.4. Special Considerations when Mounting GFS2 File Systems .......................................... 22

3.5. GFS2 Quota Management .......................................................................................... 23

3.5.1. Configuring Disk Quotas .................................................................................. 23

3.5.2. Managing Disk Quotas ..................................................................................... 26

3.5.3. Keeping Quotas Accurate ................................................................................ 27

3.5.4. Synchronizing Quotas with the quotasync Command ....................................... 27

3.5.5. References ...................................................................................................... 28

3.6. Growing a File System ............................................................................................... 29

3.7. Adding Journals to a File System ................................................................................ 30

3.8. Data Journaling .......................................................................................................... 32

3.9. Configuring atime Updates ........................................................................................ 33

3.9.1. Mount with relatime ..................................................................................... 33

3.9.2. Mount with noatime ....................................................................................... 34

3.10. Suspending Activity on a File System ........................................................................ 34

3.11. Repairing a File System ............................................................................................ 35

3.12. Bind Mounts and Context-Dependent Path Names ..................................................... 37

3.13. Bind Mounts and File System Mount Order ................................................................ 38

3.14. The GFS2 Withdraw Function ................................................................................... 40

4. Diagnosing and Correcting Problems with GFS2 File Systems 43

4.1. GFS2 File System Shows Slow Performance ............................................................... 43

4.2. Setting Up NFS Over GFS2 ........................................................................................ 43

4.3. GFS2 File System Hangs and Requires Reboot of One Node ....................................... 44

4.4. GFS2 File System Hangs and Requires Reboot of All Nodes ........................................ 44

iii

Global File System 2

4.5. GFS2 File System Does Not Mount on Newly-Added Cluster Node ................................ 45

4.6. Space Indicated as Used in Empty File System ........................................................... 45

A. GFS2 Quota Management with the gfs2_quota Command 47

A.1. Setting Quotas with the gfs2_quota command .......................................................... 47

A.2. Displaying Quota Limits and Usage with the gfs2_quota Command ............................ 48

A.3. Synchronizing Quotas with the gfs2_quota Command ............................................... 50

A.4. Enabling/Disabling Quota Enforcement ........................................................................ 51

A.5. Enabling Quota Accounting ........................................................................................ 51

B. Converting a File System from GFS to GFS2 53

C. GFS2 tracepoints and the debugfs glocks File 55

C.1. GFS2 tracepoint Types .............................................................................................. 55

C.2. Tracepoints ................................................................................................................ 55

C.3. Glocks ....................................................................................................................... 56

C.4. The glock debugfs Interface ....................................................................................... 57

C.5. Glock Holders ............................................................................................................ 60

C.6. Glock tracepoints ....................................................................................................... 61

C.7. Bmap tracepoints ....................................................................................................... 61

C.8. Log tracepoints .......................................................................................................... 61

C.9. References ................................................................................................................ 62

D. Revision History 63

Index 65

Introduction

This book provides information about configuring and maintaining Red Hat GFS2 (Red Hat Global File

System 2), which is included in the Resilient Storage Add-On.

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:

• Installation Guide — Documents relevant information regarding the installation of Red Hat

Enterprise Linux 6.

• Deployment Guide — Documents relevant information regarding the deployment, configuration and

administration of Red Hat Enterprise Linux 6.

• Storage Administration Guide — Provides instructions on how to effectively manage storage devices

and file systems on Red Hat Enterprise Linux 6.

For more information about the High Availability Add-On and the Resilient Storage Add-On for Red

Hat Enterprise Linux 6, refer to the following resources:

• High Availability Add-On Overview — Provides a high-level overview of the Red Hat High Availability

Add-On.

• Cluster Administration — Provides information about installing, configuring and managing the High

Availability Add-On.

• Logical Volume Manager Administration — Provides a description of the Logical Volume Manager

(LVM), including information on running LVM in a clustered environment.

• DM Multipath — Provides information about using the Device-Mapper Multipath feature of Red Hat

Enterprise Linux.

• Load Balancer Administration — Provides information on configuring high-performance systems and

services with the Load Balancer Add-On, a set of integrated software components that provide Linux

Virtual Servers (LVS) for balancing IP load across a set of real servers.

• Release Notes — Provides information about the current release of Red Hat products.

High Availability Add-On 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://

docs.redhat.com/docs/en-US/index.html .

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