Red Hat GFS 6.0: Administrator's Guide
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9.12. Repairing a File System

When nodes fail with the file system mounted, file system journaling allows fast recovery. However, if a storage device loses power or is physically disconnected, file system corruption may occur. (Journaling cannot be used to recover from storage subsystem failures.) When that type of corruption occurs, the GFS file system can be recovered by using the gfs_fsck command.

The gfs_fsck command must only be run on a file system that is unmounted from all nodes.

Note

	Note
	On nodes running Red Hat GFS 6.0 for Red Hat Enterprise Linux 3 Update 5 and later, the `gfs_fsck` command has changed from previous releases of Red Hat GFS in the following ways: You can no longer set the interactive mode with [Ctrl]-[C]. Pressing [Ctrl]-[C] now cancels the `gfs_fsck` command. Do not press [Ctr]-[C] unless you want to cancel the command. You can increase the level of verbosity by using the `-v` flag. Adding a second `-v` flag increases the level again. You can decrease the level of verbosity by using the `-q` flag. Adding a second `-q` flag decreases the level again. The `-n` option opens a file system as read-only and answers `no` to any queries automatically. The option provides a way of trying the command to reveal errors without actually allowing the `gfs_fsck` command to take effect. Refer to the `gfs_fsck` man page, `gfs_fsck(8)`, for additional information about other command options.

On nodes running Red Hat GFS 6.0 for Red Hat Enterprise Linux 3 Update 5 and later, the gfs_fsck command has changed from previous releases of Red Hat GFS in the following ways:

You can no longer set the interactive mode with [Ctrl]-[C]. Pressing [Ctrl]-[C] now cancels the gfs_fsck command. Do not press [Ctr]-[C] unless you want to cancel the command.
You can increase the level of verbosity by using the -v flag. Adding a second -v flag increases the level again.
You can decrease the level of verbosity by using the -q flag. Adding a second -q flag decreases the level again.
The -n option opens a file system as read-only and answers no to any queries automatically. The option provides a way of trying the command to reveal errors without actually allowing the gfs_fsck command to take effect.

Refer to the gfs_fsck man page, gfs_fsck(8), for additional information about other command options.

9.12.1. Usage

gfs_fsck -y BlockDevice

-y: The -y flag causes all questions to be answered with yes. With the -y specified, the gfs_fsck does not prompt you for an answer before making changes.
BlockDevice: Specifies the block device where the GFS file system resides.

9.12.2. Example

In this example, the GFS file system residing on block device /dev/pool/pool0 is repaired. All queries to repair are automatically answered with yes.

gfs_fsck -y /dev/pool/pool0

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