quotacheck(8)		    System Manager's Manual		 quotacheck(8)



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	speci-
       fied). 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	 addi-
       tional 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 writ-
	      ing 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 spec-
	      ified 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 dupli-
	      cate 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),  con-
       vertquota(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>



				Fri Jul 20 2001			 quotacheck(8)