{ "mode": "man", "parameter": "RESIZE2FS", "section": "8", "url": "https://www.chedong.com/phpMan.php/man/RESIZE2FS/8/json", "generated": "2026-05-30T09:07:47Z", "synopsis": "resize2fs [ -fFpPMbs ] [ -d debug-flags ] [ -S RAID-stride ] [ -z undofile ] device [ size ]", "sections": { "NAME": { "content": "resize2fs - ext2/ext3/ext4 file system resizer\n", "subsections": [] }, "SYNOPSIS": { "content": "resize2fs [ -fFpPMbs ] [ -d debug-flags ] [ -S RAID-stride ] [ -z undofile ] device [ size ]\n", "subsections": [] }, "DESCRIPTION": { "content": "The resize2fs program will resize ext2, ext3, or ext4 file systems. It can be used to en‐\nlarge or shrink an unmounted file system located on device. If the file system is mounted,\nit can be used to expand the size of the mounted file system, assuming the kernel and the\nfile system supports on-line resizing. (Modern Linux 2.6 kernels will support on-line resize\nfor file systems mounted using ext3 and ext4; ext3 file systems will require the use of file\nsystems with the resizeinode feature enabled.)\n\nThe size parameter specifies the requested new size of the file system. If no units are\nspecified, the units of the size parameter shall be the file system blocksize of the file\nsystem. Optionally, the size parameter may be suffixed by one of the following units desig‐\nnators: 'K', 'M', 'G', 'T' (either upper-case or lower-case) or 's' for power-of-two kilo‐\nbytes, megabytes, gigabytes, terabytes or 512 byte sectors respectively. The size of the file\nsystem may never be larger than the size of the partition. If size parameter is not speci‐\nfied, it will default to the size of the partition.\n\nThe resize2fs program does not manipulate the size of partitions. If you wish to enlarge a\nfile system, you must make sure you can expand the size of the underlying partition first.\nThis can be done using fdisk(8) by deleting the partition and recreating it with a larger\nsize or using lvextend(8), if you're using the logical volume manager lvm(8). When recreat‐\ning the partition, make sure you create it with the same starting disk cylinder as before!\nOtherwise, the resize operation will certainly not work, and you may lose your entire file\nsystem. After running fdisk(8), run resize2fs to resize the ext2 file system to use all of\nthe space in the newly enlarged partition.\n\nIf you wish to shrink an ext2 partition, first use resize2fs to shrink the size of file sys‐\ntem. Then you may use fdisk(8) to shrink the size of the partition. When shrinking the size\nof the partition, make sure you do not make it smaller than the new size of the ext2 file\nsystem!\n\nThe -b and -s options enable and disable the 64bit feature, respectively. The resize2fs pro‐\ngram will, of course, take care of resizing the block group descriptors and moving other data\nblocks out of the way, as needed. It is not possible to resize the file system concurrent\nwith changing the 64bit status.\n", "subsections": [] }, "OPTIONS": { "content": "", "subsections": [ { "name": "-b", "content": "other metadata out of the way.\n", "flag": "-b" }, { "name": "-d", "content": "Turns on various resize2fs debugging features, if they have been compiled into the bi‐\nnary. debug-flags should be computed by adding the numbers of the desired features\nfrom the following list:\n2 - Debug block relocations\n4 - Debug inode relocations\n8 - Debug moving the inode table\n16 - Print timing information\n32 - Debug minimum file system size (-M) calculation\n", "flag": "-d" }, { "name": "-f", "content": "safety checks which resize2fs normally enforces.\n", "flag": "-f" }, { "name": "-F", "content": "doing resize2fs time trials.\n", "flag": "-F" }, { "name": "-M", "content": "stored in the file system.\n", "flag": "-M" }, { "name": "-p", "content": "trivial) resize operation, so that the user can keep track of what the program is do‐\ning. (For very fast resize operations, no progress bars may be displayed.)\n", "flag": "-p" }, { "name": "-P", "content": "shrunk using resize2fs's -M option and then exit.\n", "flag": "-P" }, { "name": "-s", "content": "", "flag": "-s" }, { "name": "-S", "content": "The resize2fs program will heuristically determine the RAID stride that was specified\nwhen the file system was created. This option allows the user to explicitly specify a\nRAID stride setting to be used by resize2fs instead.\n", "flag": "-S" }, { "name": "-z", "content": "Before overwriting a file system block, write the old contents of the block to an undo\nfile. This undo file can be used with e2undo(8) to restore the old contents of the\nfile system should something go wrong. If the empty string is passed as the undofile\nargument, the undo file will be written to a file named resize2fs-device.e2undo in the\ndirectory specified via the E2FSPROGSUNDODIR environment variable.\n\nWARNING: The undo file cannot be used to recover from a power or system crash.\n", "flag": "-z" } ] }, "KNOWN BUGS": { "content": "The minimum size of the file system as estimated by resize2fs may be incorrect, especially\nfor file systems with 1k and 2k blocksizes.\n", "subsections": [] }, "AUTHOR": { "content": "resize2fs was written by Theodore Ts'o .\n", "subsections": [] }, "COPYRIGHT": { "content": "Resize2fs is Copyright 1998 by Theodore Ts'o and PowerQuest, Inc. All rights reserved. As\nof April, 2000 Resize2fs may be redistributed under the terms of the GPL.\n", "subsections": [] }, "SEE ALSO": { "content": "fdisk(8), e2fsck(8), mke2fs(8), lvm(8), lvextend(8)\n\n\n\nE2fsprogs version 1.46.5 December 2021 RESIZE2FS(8)", "subsections": [] } }, "summary": "resize2fs - ext2/ext3/ext4 file system resizer", "flags": [ { "flag": "-b", "long": null, "arg": null, "description": "other metadata out of the way." }, { "flag": "-d", "long": null, "arg": null, "description": "Turns on various resize2fs debugging features, if they have been compiled into the bi‐ nary. debug-flags should be computed by adding the numbers of the desired features from the following list: 2 - Debug block relocations 4 - Debug inode relocations 8 - Debug moving the inode table 16 - Print timing information 32 - Debug minimum file system size (-M) calculation" }, { "flag": "-f", "long": null, "arg": null, "description": "safety checks which resize2fs normally enforces." }, { "flag": "-F", "long": null, "arg": null, "description": "doing resize2fs time trials." }, { "flag": "-M", "long": null, "arg": null, "description": "stored in the file system." }, { "flag": "-p", "long": null, "arg": null, "description": "trivial) resize operation, so that the user can keep track of what the program is do‐ ing. (For very fast resize operations, no progress bars may be displayed.)" }, { "flag": "-P", "long": null, "arg": null, "description": "shrunk using resize2fs's -M option and then exit." }, { "flag": "-s", "long": null, "arg": null, "description": "" }, { "flag": "-S", "long": null, "arg": null, "description": "The resize2fs program will heuristically determine the RAID stride that was specified when the file system was created. This option allows the user to explicitly specify a RAID stride setting to be used by resize2fs instead." }, { "flag": "-z", "long": null, "arg": null, "description": "Before overwriting a file system block, write the old contents of the block to an undo file. This undo file can be used with e2undo(8) to restore the old contents of the file system should something go wrong. If the empty string is passed as the undofile argument, the undo file will be written to a file named resize2fs-device.e2undo in the directory specified via the E2FSPROGSUNDODIR environment variable. WARNING: The undo file cannot be used to recover from a power or system crash." } ], "examples": [], "see_also": [ { "name": "fdisk", "section": "8", "url": "https://www.chedong.com/phpMan.php/man/fdisk/8/json" }, { "name": "e2fsck", "section": "8", "url": "https://www.chedong.com/phpMan.php/man/e2fsck/8/json" }, { "name": "mke2fs", "section": "8", "url": "https://www.chedong.com/phpMan.php/man/mke2fs/8/json" }, { "name": "lvm", "section": "8", "url": "https://www.chedong.com/phpMan.php/man/lvm/8/json" }, { "name": "lvextend", "section": "8", "url": "https://www.chedong.com/phpMan.php/man/lvextend/8/json" } ] }