2 .\" Copyright 1997 by Theodore Ts'o. All Rights Reserved.
4 .\" .TH RESIZE2FS 8 "@E2FSPROGS_MONTH@ @E2FSPROGS_YEAR@" "E2fsprogs version @E2FSPROGS_VERSION@"
5 .TH RESIZE2FS 8 "@E2FSPROGS_MONTH@ @E2FSPROGS_YEAR@" "E2fsprogs version @E2FSPROGS_VERSION@"
7 resize2fs \- ext2/ext3/ext4 file system resizer
32 program will resize ext2, ext3, or ext4 file systems. It can be used to
33 enlarge or shrink an unmounted file system located on
35 If the file system is mounted, it can be used to expand the size of the
36 mounted file system, assuming the kernel and the file system supports
37 on-line resizing. (Modern Linux 2.6 kernels will support on-line resize
38 for file systems mounted using ext3 and ext4; ext3 file systems will
39 require the use of file systems with the resize_inode feature enabled.)
43 parameter specifies the requested new size of the file system.
44 If no units are specified, the units of the
46 parameter shall be the file system blocksize of the file system.
49 parameter may be suffixed by one of the following units
50 designators: 'K', 'M', 'G', 'T' (either upper-case or lower-case) or 's'
51 for power-of-two kilobytes, megabytes, gigabytes, terabytes or 512 byte
52 sectors respectively. The
54 of the file system may never be larger than the size of the partition.
57 parameter is not specified, it will default to the size of the partition.
61 program does not manipulate the size of partitions. If you wish to enlarge
62 a file system, you must make sure you can expand the size of the
63 underlying partition first. This can be done using
65 by deleting the partition and recreating it with a larger size or using
67 if you're using the logical volume manager
70 recreating the partition, make sure you create it with the same starting
71 disk cylinder as before! Otherwise, the resize operation will
72 certainly not work, and you may lose your entire file system.
75 run resize2fs to resize the ext2 file system
76 to use all of the space in the newly enlarged partition.
78 If you wish to shrink an ext2 partition, first use
80 to shrink the size of file system. Then you may use
82 to shrink the size of the partition. When shrinking the size of
83 the partition, make sure you do not make it smaller than the new size
84 of the ext2 file system!
90 options enable and disable the 64bit feature, respectively. The resize2fs
91 program will, of course, take care of resizing the block group descriptors
92 and moving other data blocks out of the way, as needed. It is not possible
93 to resize the file system concurrent with changing the 64bit status.
97 Turns on the 64bit feature, resizes the group descriptors as necessary, and
98 moves other metadata out of the way.
100 .B \-d \fIdebug-flags
101 Turns on various resize2fs debugging features, if they have been compiled
104 should be computed by adding the numbers of the desired features
105 from the following list:
107 2 \-\ Debug block relocations
109 4 \-\ Debug inode relocations
111 8 \-\ Debug moving the inode table
113 16 \-\ Print timing information
115 32 \-\ Debug minimum file system size (\-M) calculation
118 Forces resize2fs to proceed with the file system resize operation, overriding
119 some safety checks which resize2fs normally enforces.
122 Flush the file system device's buffer caches before beginning. Only
123 really useful for doing
128 Shrink the file system to minimize its size as much as possible,
129 given the files stored in the file system.
132 Print out percentage completion bars for each
134 phase during an offline (non-trivial) resize operation, so that the user
135 can keep track of what the program is doing. (For very fast resize
136 operations, no progress bars may be displayed.)
139 Print an estimate of the number of file system blocks in the file system
140 if it is shrunk using
143 option and then exit.
146 Turns off the 64bit feature and frees blocks that are no longer in use.
148 .B \-S \fIRAID-stride
151 program will heuristically determine the RAID stride that was specified
152 when the file system was created. This option allows the user to
153 explicitly specify a RAID stride setting to be used by resize2fs instead.
156 Before overwriting a file system block, write the old contents of the block to
157 an undo file. This undo file can be used with e2undo(8) to restore the old
158 contents of the file system should something go wrong. If the empty string is
159 passed as the undo_file argument, the undo file will be written to a file named
160 resize2fs-\fIdevice\fR.e2undo in the directory specified via the
161 \fIE2FSPROGS_UNDO_DIR\fR environment variable.
163 WARNING: The undo file cannot be used to recover from a power or system crash.
165 The minimum size of the file system as estimated by resize2fs may be
166 incorrect, especially for file systems with 1k and 2k blocksizes.
169 was written by Theodore Ts'o <tytso@mit.edu>.
171 Resize2fs is Copyright 1998 by Theodore Ts'o and PowerQuest, Inc. All
175 may be redistributed under the terms of the GPL.