Red Hat GLOBAL FILE SYSTEM 5.2 Installationsanleitung PDF herunterladen (Seite 37)

7. Adding Journals to a File System

The gfs_jadd command is used to add journals to a GFS file system after the device where the

file system resides has been expanded. Running a gfs_jadd command on a GFS file system

uses space between the current end of the file system and the end of the device where the file

system resides. When the fill operation is completed, the journal index is updated.

The gfs_jadd command must be run on mounted file system, but it only needs to be run on one

node in the cluster. All the other nodes sense that the expansion has occurred.

To verify that the changes were successful, use the gfs_jadd command with the -T (test) and

-v (verbose) flags. Running the command with those flags displays the current state of the

mounted GFS file system.

Usage

gfs_jadd -j Number MountPoint

Number

Specifies the number of new journals to be added.

MountPoint

Specifies the directory where the GFS file system is mounted.

Comments

Before running the gfs_jadd command:

• Back up important data on the file system.

• Run a df MountPoint command to display the volume used by the file system where

journals will be added.

• Expand the underlying cluster volume with LVM. For information on administering LVM

volumes, see the LVM Administrator's Guide

You can find out how many journals are currently used by the filesystem with the gfs_tool df

MountPoint command. In the following example, the file system mounted at /mnt/gfs uses 8

journals.

[root@tng3-1 gfs]# gfs_tool df /mnt/gfs

/mnt/gfs:

SB lock proto = "lock_dlm"

SB lock table = "tng3-cluster:mydata1"

SB ondisk format = 1309

Usage

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Red Hat GLOBAL FILE SYSTEM 5.2 Installationsanleitung Seite 37