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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.

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