resize/resize2fs.8.in

   1 .\" -*- nroff -*-
   2 .\" Copyright 1997 by Theodore Ts'o.  All Rights Reserved.
   3 .\"
   4 .\" .TH RESIZE2FS 8 "@E2FSPROGS_MONTH@ @E2FSPROGS_YEAR@" "E2fsprogs version @E2FSPROGS_VERSION@"
   5 .TH RESIZE2FS 8 "@E2FSPROGS_MONTH@ @E2FSPROGS_YEAR@" "E2fsprogs version @E2FSPROGS_VERSION@"
   6 .SH NAME
   7 resize2fs \- ext2/ext3 file system resizer
   8 .SH SYNOPSIS
   9 .B resize2fs
  10 [
  11 .B \-d
  12 .I debug-flags
  13 ]
  14 [
  15 .B \-S
  16 .I RAID-stride
  17 ]
  18 [
  19 .B \-f
  20 ]
  21 [
  22 .B \-F
  23 ]
  24 [
  25 .B \-p
  26 ]
  27 .I device
  28 [
  29 .I size
  30 ]
  31 .SH DESCRIPTION
  32 The
  33 .B resize2fs
  34 program will resize ext2 or ext3 file systems.  It can be used to enlarge or
  35 shrink an unmounted file system located on
  36 .IR device .
  37 If the filesystem is mounted, it can be used to expand the size of the
  38 mounted filesystem, assuming the kernel supports on-line resizing.  (As
  39 of this writing, the Linux 2.6 kernel supports on-line resize for
  40 filesystems mounted using ext3 only.).
  41 .PP
  42 The
  43 .I size
  44 parameter specifies the requested new size of the filesystem.
  45 If no units are specified, the units of the
  46 .I size
  47 parameter shall be the filesystem blocksize of the filesystem.
  48 Optionally, the
  49 .I size
  50 parameter may be suffixed by one of the following the units
  51 designators: 's', 'K', 'M', or 'G',
  52 for 512 byte sectors, kilobytes, megabytes, or gigabytes, respectively.
  53 The
  54 .I size
  55 of the filesystem may never be larger than the size of the partition.
  56 If
  57 .I size
  58 parameter is not specified, it will default to the size of the partition.
  59 .PP
  60 The
  61 .B resize2fs
  62 program does not manipulate the size of partitions.  If you wish to enlarge
  63 a filesystem, you must make sure you can expand the size of the
  64 underlying partition first.  This can be done using
  65 .BR fdisk (8)
  66 by deleting the partition and recreating it with a larger size or using
  67 .BR lvextend (8),
  68 if you're using the logical volume manager
  69 .BR lvm (8).
  70 When
  71 recreating the partition, make sure you create it with the same starting
  72 disk cylinder as before!  Otherwise, the resize operation will
  73 certainly not work, and you may lose your entire filesystem.
  74 After running
  75 .BR fdisk (8),
  76 run resize2fs to resize the ext2 filesystem
  77 to use all of the space in the newly enlarged partition.
  78 .PP
  79 If you wish to shrink an ext2 partition, first use
  80 .B resize2fs
  81 to shrink the size of filesystem.  Then you may use
  82 .BR fdisk (8)
  83 to shrink the size of the partition.  When shrinking the size of
  84 the partition, make sure you do not make it smaller than the new size
  85 of the ext2 filesystem!
  86 .SH OPTIONS
  87 .TP
  88 .B \-d \fIdebug-flags
  89 Turns on various resize2fs debugging features, if they have been compiled
  90 into the binary.
  91 .I debug-flags
  92 should be computed by adding the numbers of the desired features
  93 from the following list:
  94 .br
  95 \       1\      \-\ Print out all disk I/O
  96 .br
  97 \       2\      \-\ Debug block relocations
  98 .br
  99 \       8\      \-\ Debug inode relocations
 100 .br
 101 \       16\     \-\ Debug moving the inode table
 102 .TP
 103 .B \-S \fIRAID-stride
 104 The
 105 .B resize2fs
 106 program will heuristically determine the RAID stride that was specified
 107 when the filesystem was created.  This option allows the user to
 108 explicitly specify a RAID stride setting to be used by resize2fs instead.
 109 .TP
 110 .B \-p
 111 Prints out a percentage completion bars for each
 112 .B resize2fs
 113 operation, so that the user can keep track of what
 114 the program is doing.
 115 .TP
 116 .B \-f
 117 Forces resize2fs to proceed with the filesystem resize operation, overriding
 118 some safety checks which resize2fs normally enforces.
 119 .TP
 120 .B \-F
 121 Flush the filesystem device's buffer caches before beginning.  Only
 122 really useful for doing
 123 .B resize2fs
 124 time trials.
 125 .SH AUTHOR
 126 .B resize2fs
 127 was written by Theodore Ts'o <tytso@mit.edu>.
 128 .SH COPYRIGHT
 129 Resize2fs is Copyright 1998 by Theodore Ts'o and PowerQuest, Inc.  All
 130 rights reserved.
 131 As of April, 2000
 132 .B Resize2fs
 133 may be redistributed under the terms of the GPL.
 134 .SH SEE ALSO
 135 .BR fdisk (8),
 136 .BR e2fsck (8),
 137 .BR mke2fs (8),
 138 .BR lvm (8),
 139 .BR lvextend (8)