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3.10. Repairing a GFS2 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, you can recover the GFS2 file system by using the
fsck.gfs2 command.
Important
The
fsck.gfs2 command must be run only on a file system that is unmounted from all nodes. When the file system is being managed as a Pacemaker cluster resource, you can disable the file system resource, which unmounts the file system. After running the fsck.gfs2 command, you enable the file system resource again. The timeout value specified with the --wait option of the pcs resource disable indicates a value in seconds.
pcs resource disable --wait=timeoutvalue resource_id pcs resource enable resource_id
# pcs resource disable --wait=timeoutvalue resource_id
[fsck.gfs2]
# pcs resource enable resource_id
To ensure that
fsck.gfs2 command does not run on a GFS2 file system at boot time, you can set the run_fsck parameter of the options argument when creating the GFS2 file system resource in a cluster. Specifying "run_fsck=no" will indicate that you should not run the fsck command.
Note
If you have previous experience using the
gfs_fsck command on GFS file systems, note that the fsck.gfs2 command differs from some earlier releases of gfs_fsck in the following ways:
- Pressing Ctrl+C while running the
fsck.gfs2command interrupts processing and displays a prompt asking whether you would like to abort the command, skip the rest of the current pass, or continue processing. - You can increase the level of verbosity by using the
-vflag. Adding a second-vflag increases the level again. - You can decrease the level of verbosity by using the
-qflag. Adding a second-qflag decreases the level again. - The
-noption opens a file system as read only and answersnoto any queries automatically. The option provides a way of trying the command to reveal errors without actually allowing thefsck.gfs2command to take effect.
Refer to the
fsck.gfs2 man page for additional information about other command options.
Running the
fsck.gfs2 command requires system memory above and beyond the memory used for the operating system and kernel. Each block of memory in the GFS2 file system itself requires approximately five bits of additional memory, or 5/8 of a byte. So to estimate how many bytes of memory you will need to run the fsck.gfs2 command on your file system, determine how many blocks the file system contains and multiply that number by 5/8.
For example, to determine approximately how much memory is required to run the
fsck.gfs2 command on a GFS2 file system that is 16TB with a block size of 4K, first determine how many blocks of memory the file system contains by dividing 16TB by 4K:
17592186044416 / 4096 = 4294967296
17592186044416 / 4096 = 4294967296
Since this file system contains 4294967296 blocks, multiply that number by 5/8 to determine how many bytes of memory are required:
4294967296 * 5/8 = 2684354560
4294967296 * 5/8 = 2684354560
This file system requires approximately 2.6GB of free memory to run the
fsck.gfs2 command. Note that if the block size was 1K, running the fsck.gfs2 command would require four times the memory, or approximately 11GB.
Usage
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fsck.gfs2 -y BlockDevice
fsck.gfs2 -y BlockDevice-y- The
-yflag causes all questions to be answered withyes. With the-yflag specified, thefsck.gfs2command does not prompt you for an answer before making changes. BlockDevice- Specifies the block device where the GFS2 file system resides.
Example
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In this example, the GFS2 file system residing on block device
/dev/testvg/testlv is repaired. All queries to repair are automatically answered with yes.
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