scrub/e2scrub.8.in

   1 .TH E2SCRUB 8 "@E2FSPROGS_MONTH@ @E2FSPROGS_YEAR@" "E2fsprogs version @E2FSPROGS_VERSION@"
   2 .SH NAME
   3 e2scrub - check the contents of a mounted ext[234] filesystem
   4 .SH SYNOPSYS
   5 .B
   6 e2scrub [OPTION] MOUNTPOINT | DEVICE
   7 .SH DESCRIPTION
   8 .B e2scrub
   9 attempts to check (but not repair) all metadata in a mounted ext[234]
  10 filesystem if the filesystem resides on a LVM logical volume.
  11 The block device of the LVM logical volume can also be passed in.
  12
  13 This program snapshots the volume and runs a file system check on the snapshot
  14 to look for corruption errors.
  15 The LVM volume group must have at least 256MiB of unallocated space to
  16 dedicate to the snapshot or the logical volume will be skipped.
  17 The snapshot will be named
  18 .IR lvname ".e2scrub"
  19 and
  20 .B udev
  21 will not create symbolic links to it under
  22 .IR /dev/disk .
  23 Every attempt will be made to remove the snapshots prior to running
  24 .BR e2scrub ,
  25 but in a dire situation it may be necessary to remove the snapshot manually.
  26
  27 If no errors are found,
  28 .B fstrim
  29 can be called on the file system if it is mounted.
  30 If errors are found, the file system will be marked as having errors.
  31 The filesystem should be taken offline and
  32 .B e2fsck
  33 run as soon as possible, because
  34 .B e2scrub
  35 does not fix corruptions.
  36 If the filesystem is not repaired,
  37 .B e2fsck
  38 will be run before the next mount.
  39 .SH OPTIONS
  40 .TP
  41 \fB-n\fR
  42 Print what commands
  43 .B e2scrub
  44 would execute to check the file system.  (Note: the commands will not
  45 actually be executed; however, since
  46 .B e2scrub
  47 needs to run some commands to query the system to determine what
  48 commands would be executed, it still needs to be run as root.)
  49 .TP
  50 \fB-r\fR
  51 Remove the e2scrub snapshot and exit without checking anything.
  52 .TP
  53 \fB-t\fR
  54 Run
  55 .B
  56 fstrim(1)
  57 on the mounted filesystem if no errors are found.
  58 .TP
  59 \fB-V\fR
  60 Print version information and exit.
  61 .SH EXIT CODE
  62 The exit codes are the same as in
  63 .BR e2fsck (8)
  64 .SH SEE ALSO
  65 .BR e2fsck (8)
  66 .SH AUTHOR
  67 Darrick J. Wong <darrick.wong@oracle.com>
  68 .SH COPYRIGHT
  69 Copyright \[co]2018 Oracle.  License is GPLv2+. <http://www.gnu.org/licenses/gpl-2.0.html>