изменение размера файловой системы ext2 / ext3 / ext4 (ext2/ext3/ext4 file system resizer)
Имя (Name)
resize2fs - ext2/ext3/ext4 file system resizer
Синопсис (Synopsis)
resize2fs [ -fFpPMbs ] [ -d debug-flags ] [ -S RAID-stride ] [ -z
undo_file ] device [ size ]
Описание (Description)
The resize2fs program will resize ext2, ext3, or ext4 file
systems. It can be used to enlarge or shrink an unmounted file
system located on device. If the file system is mounted, it can
be used to expand the size of the mounted file system, assuming
the kernel and the file system supports on-line resizing.
(Modern Linux 2.6 kernels will support on-line resize for file
systems mounted using ext3 and ext4; ext3 file systems will
require the use of file systems with the resize_inode feature
enabled.)
The size parameter specifies the requested new size of the file
system. If no units are specified, the units of the size
parameter shall be the file system blocksize of the file system.
Optionally, the size parameter may be suffixed by one of the
following units designators: 'K', 'M', 'G', 'T' (either upper-
case or lower-case) or 's' for power-of-two kilobytes, megabytes,
gigabytes, terabytes or 512 byte sectors respectively. The size
of the file system may never be larger than the size of the
partition. If size parameter is not specified, it will default
to the size of the partition.
The resize2fs program does not manipulate the size of partitions.
If you wish to enlarge a file system, you must make sure you can
expand the size of the underlying partition first. This can be
done using fdisk(8) by deleting the partition and recreating it
with a larger size or using lvextend(8), if you're using the
logical volume manager lvm(8). When recreating the partition,
make sure you create it with the same starting disk cylinder as
before! Otherwise, the resize operation will certainly not work,
and you may lose your entire file system. After running
fdisk(8), run resize2fs to resize the ext2 file system to use all
of the space in the newly enlarged partition.
If you wish to shrink an ext2 partition, first use resize2fs to
shrink the size of file system. Then you may use fdisk(8) to
shrink the size of the partition. When shrinking the size of the
partition, make sure you do not make it smaller than the new size
of the ext2 file system!
The -b and -s options enable and disable the 64bit feature,
respectively. The resize2fs program will, of course, take care
of resizing the block group descriptors and moving other data
blocks out of the way, as needed. It is not possible to resize
the file system concurrent with changing the 64bit status.
Параметры (Options)
-b Turns on the 64bit feature, resizes the group descriptors
as necessary, and moves other metadata out of the way.
-d debug-flags
Turns on various resize2fs debugging features, if they
have been compiled into the binary. 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
-f Forces resize2fs to proceed with the file system resize
operation, overriding some safety checks which resize2fs
normally enforces.
-F Flush the file system device's buffer caches before
beginning. Only really useful for doing resize2fs time
trials.
-M Shrink the file system to minimize its size as much as
possible, given the files stored in the file system.
-p Print out percentage completion bars for each resize2fs
phase during an offline (non-trivial) resize operation, so
that the user can keep track of what the program is doing.
(For very fast resize operations, no progress bars may be
displayed.)
-P Print an estimate of the number of file system blocks in
the file system if it is shrunk using resize2fs's -M
option and then exit.
-s Turns off the 64bit feature and frees blocks that are no
longer in use.
-S RAID-stride
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.
-z undo_file
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 undo_file argument, the undo file
will be written to a file named resize2fs-device.e2undo in
the directory specified via the E2FSPROGS_UNDO_DIR
environment variable.
WARNING: The undo file cannot be used to recover from a
power or system crash.
Ошибки (баги) (Bugs)
The minimum size of the file system as estimated by resize2fs may
be incorrect, especially for file systems with 1k and 2k
blocksizes.
