NAME¶
quotacheck - scan a filesystem for disk usage, create, check and repair quota
files
SYNOPSIS¶
quotacheck [
-gubcfinvdMmR ] [
-F quota-format ]
-a |
filesystem
DESCRIPTION¶
quotacheck examines each filesystem, builds a table of current disk
usage, and compares this table against that recorded in the disk quota file
for the filesystem (this step is omitted if option
-c is specified). If
any inconsistencies are detected, both the quota file and the current system
copy of the incorrect quotas are updated (the latter only occurs if an active
filesystem is checked which is not advised). By default, only user quotas are
checked.
quotacheck expects each filesystem to be checked to have quota
files named
[a]quota.user and
[a]quota.group located at the root
of the associated filesystem. If a file is not present,
quotacheck will
create it.
If the quota file is corrupted,
quotacheck tries to save as much data as
possible. Rescuing data may need user intervention. With no additional options
quotacheck will simply exit in such a situation. When in interactive
mode (option
-i) , the user is asked for advice. Advice can also be
provided from command line (see option
-n) , which is useful when
quotacheck is run automatically (ie. from script) and failure is
unacceptable.
quotacheck should be run each time the system boots and mounts non-valid
filesystems. This is most likely to happen after a system crash.
It is strongly recommended to run
quotacheck with quotas turned off for
the filesystem. Otherwise, possible damage or loss to data in the quota files
can result. It is also unwise to run
quotacheck on a live filesystem as
actual usage may change during the scan. To prevent this,
quotacheck
tries to remount the filesystem read-only before starting the scan. After the
scan is done it remounts the filesystem read-write. You can disable this with
option
-m. You can also make
quotacheck ignore the failure to
remount the filesystem read-only with option
-M.
OPTIONS¶
- -b, --backup
- Forces quotacheck to make backups of the quota file before writing
the new data.
- -v, --verbose
- quotacheck reports its operation as it progresses. Normally it
operates silently. If the option is specified twice, also the current
directory is printed (note that printing can slow down the scan
measurably).
- -d, --debug
- Enable debugging mode. It will result in a lot of information which can be
used in debugging the program. The output is very verbose and the scan
will be slow.
- -u, --user
- Only user quotas listed in /etc/mtab or on the filesystems
specified are to be checked. This is the default action.
- -g, --group
- Only group quotas listed in /etc/mtab or on the filesystems
specified are to be checked.
- -c, --create-files
- Don't read existing quota files. Just perform a new scan and save it to
disk. quotacheck also skips scanning of old quota files when they
are not found.
- -f, --force
- Forces checking and writing of new quota files on filesystems with quotas
enabled. This is not recommended as the created quota files may be out of
sync.
- -M, --try-remount
- This flag forces checking of filesystem in read-write mode if a remount
fails. Do this only when you are sure no process will write to a
filesystem while scanning.
- -m, --no-remount
- Don't try to remount filesystem read-only. See comment with option
-M.
- -i, --interactive
- Interactive mode. By default quotacheck exits when it finds an
error. In interactive mode user is asked for input instead. See option
-n.
- -n, --use-first-dquot
- If the quota files become corrupted, it is possible for duplicate entries
for a single user or group ID to exist. Normally in this case,
quotacheck exits or asks user for input. When this option is set,
the first entry found is always used (this option works in interactive
mode too).
- -F, --format=format-name
- Check and fix quota files of specified format (ie. don't perform format
auto-detection). This is recommended as detection might not work well on
corrupted quota files. Possible format names are: vfsold Original
quota format with 16-bit UIDs / GIDs, vfsv0 Quota format with
32-bit UIDs / GIDs, 64-bit space usage, 32-bit inode usage and limits,
vfsv1 Quota format with 64-bit quota limits and usage, rpc
(quota over NFS), xfs (quota on XFS filesystem)
- -a, --all
- Check all mounted non-NFS filesystems in /etc/mtab
- -R, --exclude-root
- When used together with the -a option, all filesystems except for
the root filesystem are checked for quotas.
NOTE¶
quotacheck should only be run by super-user. Non-privileged users are
presumably not allowed to read all the directories on the given filesystem.
SEE ALSO¶
quota(1),
quotactl(2),
fstab(5),
quotaon(8),
repquota(8),
convertquota(8),
setquota(8),
edquota(8),
fsck(8),
efsck(8),
e2fsck(8),
xfsck(8)
FILES¶
- aquota.user or aquota.group
- located at filesystem root with quotas (version 2 quota, non-XFS
filesystems)
- quota.user or quota.group
- located at filesystem root with quotas (version 1 quota, non-XFS
filesystems)
- /etc/mtab
- names and locations of mounted filesystems
AUTHOR¶
Jan Kara <jack@suse.cz>
Based on old
quotacheck by:
Edvard Tuinder <ed@elm.net>
Marco van Wieringen <mvw@planets.elm.net>