xfs_growfs, xfs_info - expand an XFS filesystem
] [ -D size
] [ -e
] [ -L size
] [ -m maxpct
] [ -R size
[ -t mtab
expands an existing XFS filesystem (see xfs(5)
argument is the pathname of the directory where the
filesystem is mounted. The filesystem must be mounted to be grown (see
). The existing contents of the filesystem are undisturbed, and
the added space becomes available for additional file storage.
is equivalent to invoking xfs_growfs
with the -n
option (see discussion below).
- -d | -D size
- Specifies that the data section of the filesystem should be
grown. If the -D size option is given, the data section is
grown to that size, otherwise the data section is grown to the
largest size possible with the -d option. The size is expressed in
- Allows the real-time extent size to be specified. In
mkfs.xfs(8) this is specified with -r
- The new log is an internal log (inside the data section).
[NOTE: This option is not implemented]
- -l | -L size
- Specifies that the log section of the filesystem should be
grown, shrunk, or moved. If the -L size option is given, the
log section is changed to be that size, if possible. The size is
expressed in filesystem blocks. The size of an internal log must be
smaller than the size of an allocation group (this value is printed at
mkfs(8) time). If neither -i nor -x is given with
-l, the log continues to be internal or external as it was before.
[NOTE: These options are not implemented]
- Specify a new value for the maximum percentage of space in
the filesystem that can be allocated as inodes. In mkfs.xfs(8) this
is specified with -i maxpct=nn.
- Specifies that no change to the filesystem is to be made.
The filesystem geometry is printed, and argument checking is performed,
but no growth occurs. See output examples below.
- -r | -R size
- Specifies that the real-time section of the filesystem
should be grown. If the -R size option is given, the
real-time section is grown to that size, otherwise the real-time section
is grown to the largest size possible with the -r option. The size
is expressed in filesystem blocks. The filesystem does not need to have
contained a real-time section before the xfs_growfs operation.
- Specifies an alternate mount table file (default is
/proc/mounts if it exists, else /etc/mtab). This is used
when working with filesystems mounted without writing to /etc/mtab
file - refer to mount(8) for further details.
- Prints the version number and exits. The mount-point
argument is not required with -V.
is most often used in conjunction with logical volumes (see
on Linux). However, it can also be used on a
regular disk partition, for example if a partition has been enlarged while
retaining the same starting block.
Filesystems normally occupy all of the space on the device where they reside. In
order to grow a filesystem, it is necessary to provide added space for it to
occupy. Therefore there must be at least one spare new disk partition
available. Adding the space is often done through the use of a logical volume
Understanding xfs_info output.
Suppose one has the following "xfs_info /dev/sda" output:
meta-data=/dev/sda isize=256 agcount=32, agsize=16777184 blks
= sectsz=512 attr=2
data = bsize=4096 blocks=536869888, imaxpct=5
= sunit=32 swidth=128 blks
naming =version 2 bsize=4096
log =internal bsize=4096 blocks=32768, version=2
= sectsz=512 sunit=32 blks, lazy-count=1
realtime =none extsz=524288 blocks=0, rtextents=0
Here, the data section of the output indicates "bsize=4096", meaning
the data block size for this filesystem is 4096 bytes. This section also shows
"sunit=32 swidth=128 blks", which means the stripe unit is 32*4096
bytes = 128 kibibytes and the stripe width is 128*4096 bytes = 512 kibibytes.
A single stripe of this filesystem therefore consists of four stripe units
(128 blocks / 32 blocks per unit).