Red Hat GFS 6.0 -, Administrator'S Manual

Page: 6 / 192

9.7. Direct I/O ....................................................................................................................... 103
9.7.1.
O_DIRECT
....................................................................................................... 103
9.7.2. GFS File Attribute........................................................................................... 103
9.7.3. GFS Directory Attribute ................................................................................. 104
9.8. Data Journaling .............................................................................................................. 104
9.8.1. Usage............................................................................................................... 105
9.8.2. Examples......................................................................................................... 105
9.9. Configuring
atime
Updates .......................................................................................... 105
9.9.1. Mount with
noatime
...................................................................................... 106
9.9.2. Tune GFS
atime
Quantum ............................................................................ 106
9.10. Suspending Activity on a File System ......................................................................... 107
9.10.1. Usage............................................................................................................. 107
9.10.2. Examples....................................................................................................... 108
9.11. Displaying Extended GFS Information and Statistics ................................................. 108
9.11.1. Usage............................................................................................................. 108
9.11.2. Examples....................................................................................................... 109
9.12. Repairing a File System ............................................................................................... 109
9.12.1. Usage............................................................................................................. 109
9.12.2. Example ........................................................................................................ 110
9.13. Context-Dependent Path Names .................................................................................. 110
9.13.1. Usage............................................................................................................. 110
9.13.2. Example ........................................................................................................ 111
9.14. Shutting Down a GFS Cluster...................................................................................... 112
9.15. Starting a GFS Cluster ................................................................................................. 112
10. Using the Fencing System......................................................................................................... 115
10.1. How the Fencing System Works.................................................................................. 115
10.2. Fencing Methods.......................................................................................................... 115
10.2.1. APC MasterSwitch........................................................................................ 116
10.2.2. WTI Network Power Switch......................................................................... 117
10.2.3. Brocade FC Switch ....................................................................................... 117
10.2.4. Vixel FC Switch............................................................................................ 117
10.2.5. HP RILOE Card............................................................................................ 118
10.2.6. GNBD ........................................................................................................... 118
10.2.7. Manual .......................................................................................................... 118
11. Using GNBD .............................................................................................................................. 121
11.1. GNBD Driver and Command Usage ........................................................................... 121
11.1.1. Exporting a GNBD from a Server ................................................................ 121
11.1.2. Importing a GNBD on a Client ..................................................................... 123
11.2. Considerations for Using GNBD Multipath ................................................................ 123
11.2.1. Linux Page Caching ...................................................................................... 123
11.2.2. Lock Server Startup ...................................................................................... 124
11.2.3. CCS File Location ........................................................................................ 124
11.2.4. Fencing GNBD Server Nodes....................................................................... 125
11.3. Running GFS on a GNBD Server Node ...................................................................... 125
12. Using GFS
init.d
Scripts ....................................................................................................... 127
12.1. GFS
init.d
Scripts Overview ................................................................................... 127
12.2. GFS
init.d
Scripts Use............................................................................................. 127
A. Using Red Hat GFS with Red Hat Cluster Suite..................................................................... 131
A.1. Terminology .................................................................................................................. 131
A.2. Changes to Red Hat Cluster .......................................................................................... 132
A.3. Installation Scenarios .................................................................................................... 132
A.3.1. New Installations of Red Hat GFS and Red Hat Cluster Manager ................ 132
A.3.2. Adding Red Hat GFS to an Existing Red Hat Cluster Manager Deployment 132
A.3.3. Upgrading Red Hat GFS 5.2.1 to Red Hat GFS 6.0 ...................................... 133