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fsck.gfs2(8) [centos man page]

fsck.gfs2(8)						      System Manager's Manual						      fsck.gfs2(8)

NAME
fsck.gfs2 - Offline GFS and GFS2 file system checker SYNOPSIS
fsck.gfs2 [OPTION]... DEVICE WARNING
All computers must have the filesystem unmounted before running fsck.gfs2. Failure to unmount from all nodes in a cluster will likely result in filesystem corruption. DESCRIPTION
fsck.gfs2 will check that the GFS or GFS2 file system on a device is structurally valid. It should not be run on a mounted file system. If file system corruption is detected, it will attempt to repair the file system. There is a limit to what fsck.gfs2 can do. If important file system structures are destroyed, such that the checker cannot determine what the repairs should be, reparations could fail. GFS2 is a journaled file system, and as such should be able to repair damage to the file system on its own. However, faulty hardware has the ability to write incomplete blocks to a file system thereby causing corruption that GFS2 cannot fix. The first step to ensuring a healthy file system is the selection of reliable hardware (i.e. storage systems that will write complete blocks - even in the event of power failure). Note: Most file system checkers will not check the file system if it is "clean" (i.e. unmounted since the last use). The fsck.gfs program behaves differently because the storage may be shared among several nodes in a cluster, and therefore problems may have been introduced on a different computer. Therefore, fsck.gfs2 will always check the file system unless the -p (preen) option is used, in which case it fol- lows special rules (see below). OPTIONS
-a Same as the -p (preen) option. -f Force checking even if the file system seems clean. -h Help. This prints out the proper command line usage syntax. -q Quiet. -n No to all questions. By specifying this option, fsck.gfs2 will only show the changes that would be made, but not make any changes to the filesystem. -p Preen (same as -a: automatically repair the file system if it is dirty, and safe to do so, otherwise exit.) Note: If the file system has locking protocol lock_nolock, the file system is considered a non-shared storage device and the fsck is deemed safe. However, fsck.gfs2 does not know whether it was called automatically from the init process, due to options in the /etc/fstab file. Therefore, if the locking protocol is lock_dlm and -a or -p was specified, fsck.gfs2 cannot determine whether the disk is mounted by other nodes in the cluster. Therefore, the fsck is deemed to be unsafe and a warning is given if any damage or dirty journals are found. In that case, the file system should be unmounted from all nodes in the cluster and fsck.gfs2 should be run manually without the -a or -p options. -V Version. Print out the program version information. -v Verbose operation. Print more information while running. -y Yes to all questions. By specifying this option, fsck.gfs2 will not prompt before making changes. fsck.gfs2(8)

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SYSTEMD-FSCK@.SERVICE(8)				       systemd-fsck@.service					  SYSTEMD-FSCK@.SERVICE(8)

NAME
systemd-fsck@.service, systemd-fsck-root.service, systemd-fsck - File system checker logic SYNOPSIS
systemd-fsck@.service systemd-fsck-root.service /lib/systemd/systemd-fsck DESCRIPTION
systemd-fsck@.service and systemd-fsck-root.service are services responsible for file system checks. They are instantiated for each device that is configured for file system checking. systemd-fsck-root.service is responsible for file system checks on the root file system, but only if the root filesystem was not checked in the initramfs. systemd-fsck@.service is used for all other file systems and for the root file system in the initramfs. These services are started at boot if passno in /etc/fstab for the file system is set to a value greater than zero. The file system check for root is performed before the other file systems. Other file systems may be checked in parallel, except when they are on the same rotating disk. systemd-fsck does not know any details about specific filesystems, and simply executes file system checkers specific to each filesystem type (/sbin/fsck.*). This helper will decide if the filesystem should actually be checked based on the time since last check, number of mounts, unclean unmount, etc. If a file system check fails for a service without nofail, emergency mode is activated, by isolating to emergency.target. KERNEL COMMAND LINE
systemd-fsck understands these kernel command line parameters: fsck.mode= One of "auto", "force", "skip". Controls the mode of operation. The default is "auto", and ensures that file system checks are done when the file system checker deems them necessary. "force" unconditionally results in full file system checks. "skip" skips any file system checks. fsck.repair= One of "preen", "yes", "no". Controls the mode of operation. The default is "preen", and will automatically repair problems that can be safely fixed. "yes" will answer yes to all questions by fsck and "no" will answer no to all questions. SEE ALSO
systemd(1), fsck(8), systemd-quotacheck.service(8), fsck.btrfs(8), fsck.cramfs(8), fsck.ext4(8), fsck.fat(8), fsck.hfsplus(8), fsck.minix(8), fsck.ntfs(8), fsck.xfs(8) systemd 237 SYSTEMD-FSCK@.SERVICE(8)
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