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/ext4 file system resizer
   8 .SH SYNOPSIS
   9 .B resize2fs
  10 [
  11 .B \-fFpPM
  12 ]
  13 [
  14 .B \-d
  15 .I debug-flags
  16 ]
  17 [
  18 .B \-S
  19 .I RAID-stride
  20 ]
  21 .I device
  22 [
  23 .I size
  24 ]
  25 .SH DESCRIPTION
  26 The
  27 .B resize2fs
  28 program will resize ext2, ext3, or ext4 file systems.  It can be used to
  29 enlarge or shrink an unmounted file system located on
  30 .IR device .
  31 If the filesystem is mounted, it can be used to expand the size of the
  32 mounted filesystem, assuming the kernel supports on-line resizing.  (As
  33 of this writing, the Linux 2.6 kernel supports on-line resize for
  34 filesystems mounted using ext3 and ext4.).
  35 .PP
  36 The
  37 .I size
  38 parameter specifies the requested new size of the filesystem.
  39 If no units are specified, the units of the
  40 .I size
  41 parameter shall be the filesystem blocksize of the filesystem.
  42 Optionally, the
  43 .I size
  44 parameter may be suffixed by one of the following the units
  45 designators: 's', 'K', 'M', or 'G',
  46 for 512 byte sectors, kilobytes, megabytes, or gigabytes, respectively.
  47 The
  48 .I size
  49 of the filesystem may never be larger than the size of the partition.
  50 If
  51 .I size
  52 parameter is not specified, it will default to the size of the partition.
  53 .PP
  54 Note: when kilobytes is used above, I mean
  55 .IR real ,
  56 power-of-2 kilobytes, (i.e., 1024 bytes), which some politically correct
  57 folks insist should be the stupid-sounding ``kibibytes''.  The same
  58 holds true for megabytes, also sometimes known as ``mebibytes'', or
  59 gigabytes, as the amazingly silly ``gibibytes''.  Makes you want to
  60 gibber, doesn't it?
  61 .PP
  62 The
  63 .B resize2fs
  64 program does not manipulate the size of partitions.  If you wish to enlarge
  65 a filesystem, you must make sure you can expand the size of the
  66 underlying partition first.  This can be done using
  67 .BR fdisk (8)
  68 by deleting the partition and recreating it with a larger size or using
  69 .BR lvextend (8),
  70 if you're using the logical volume manager
  71 .BR lvm (8).
  72 When
  73 recreating the partition, make sure you create it with the same starting
  74 disk cylinder as before!  Otherwise, the resize operation will
  75 certainly not work, and you may lose your entire filesystem.
  76 After running
  77 .BR fdisk (8),
  78 run resize2fs to resize the ext2 filesystem
  79 to use all of the space in the newly enlarged partition.
  80 .PP
  81 If you wish to shrink an ext2 partition, first use
  82 .B resize2fs
  83 to shrink the size of filesystem.  Then you may use
  84 .BR fdisk (8)
  85 to shrink the size of the partition.  When shrinking the size of
  86 the partition, make sure you do not make it smaller than the new size
  87 of the ext2 filesystem!
  88 .SH OPTIONS
  89 .TP
  90 .B \-d \fIdebug-flags
  91 Turns on various resize2fs debugging features, if they have been compiled
  92 into the binary.
  93 .I debug-flags
  94 should be computed by adding the numbers of the desired features
  95 from the following list:
  96 .br
  97 \       2\      \-\ Debug block relocations
  98 .br
  99 \       4\      \-\ Debug inode relocations
 100 .br
 101 \       8\      \-\ Debug moving the inode table
 102 .TP
 103 .B \-f
 104 Forces resize2fs to proceed with the filesystem resize operation, overriding
 105 some safety checks which resize2fs normally enforces.
 106 .TP
 107 .B \-F
 108 Flush the filesystem device's buffer caches before beginning.  Only
 109 really useful for doing
 110 .B resize2fs
 111 time trials.
 112 .TP
 113 .B \-M
 114 Shrink the filesystem to the minimum size.
 115 .TP
 116 .B \-p
 117 Prints out a percentage completion bars for each
 118 .B resize2fs
 119 operation, so that the user can keep track of what
 120 the program is doing.
 121 .TP
 122 .B \-P
 123 Print the minimum size of the filesystem and exit.
 124 .TP
 125 .B \-S \fIRAID-stride
 126 The
 127 .B resize2fs
 128 program will heuristically determine the RAID stride that was specified
 129 when the filesystem was created.  This option allows the user to
 130 explicitly specify a RAID stride setting to be used by resize2fs instead.
 131 .SH KNOWN BUGS
 132 The minimum size of the filesystem as estimated by resize2fs may be
 133 incorrect, especially for filesystems with 1k and 2k blocksizes.
 134 .SH AUTHOR
 135 .B resize2fs
 136 was written by Theodore Ts'o <tytso@mit.edu>.
 137 .SH COPYRIGHT
 138 Resize2fs is Copyright 1998 by Theodore Ts'o and PowerQuest, Inc.  All
 139 rights reserved.
 140 As of April, 2000
 141 .B Resize2fs
 142 may be redistributed under the terms of the GPL.
 143 .SH SEE ALSO
 144 .BR fdisk (8),
 145 .BR e2fsck (8),
 146 .BR mke2fs (8),
 147 .BR lvm (8),
 148 .BR lvextend (8)