xfs_estimate(8) System Manager's Manual xfs_estimate(8)NAME
xfs_estimate - estimate the space that an XFS filesystem will take
xfs_estimate [ -h ] [ -b blocksize ] [ -i logsize ]
[ -e logsize ] [ -v ] directory ...
For each directory argument, xfs_estimate estimates the space that directory would take if it were copied to an XFS filesystem. xfs_esti-
mate does not cross mount points. The following definitions are used:
KB = *1024
MB = *1024*1024
GB = *1024*1024*1024
The xfs_estimate options are:
Use blocksize instead of the default blocksize of 4096 bytes. The modifier k can be used after the number to indicate multiplica-
tion by 1024. For example,
xfs_estimate -b 64k /
requests an estimate of the space required by the directory / on an XFS filesystem using a blocksize of 64K (65536) bytes.
-v Display more information, formatted.
-h Display usage message.
-i, -e logsize
Use logsize instead of the default log size of 1000 blocks. -i refers to an internal log, while -e refers to an external log. The
modifiers k or m can be used after the number to indicate multiplication by 1024 or 1048576, respectively.
xfs_estimate -i 1m /
requests an estimate of the space required by the directory / on an XFS filesystem using an internal log of 1 megabyte.
-V Print the version number and exits.
% xfs_estimate -e 10m /var/tmp
/var/tmp will take about 4.2 megabytes
with the external log using 2560 blocks or about 10.0 megabytes
% xfs_estimate -v -e 10m /var/tmp
directory bsize blocks megabytes logsize
/var/tmp 4096 792 4.0MB 10485760
% xfs_estimate -v /var/tmp
directory bsize blocks megabytes logsize
/var/tmp 4096 3352 14.0MB 10485760
% xfs_estimate /var/tmp
/var/tmp will take about 14.0 megabytes
Check Out this Related Man Page
xfs_growfs(8) System Manager's Manual xfs_growfs(8)NAME
xfs_growfs, xfs_info - expand an XFS filesystem
xfs_growfs [ -dilnrxV ] [ -D size ] [ -e rtextsize ] [ -L size ] [ -m maxpct ] [ -t mtab ] [ -R size ] mount-point
xfs_info [ -t mtab ] mount-point
xfs_growfs expands an existing XFS filesystem (see xfs(5)). The mount-point argument is the pathname of the directory where the filesystem
is mounted. The filesystem must be mounted to be grown (see mount(8)). The existing contents of the filesystem are undisturbed, and the
added space becomes available for additional file storage.
xfs_info is equivalent to invoking xfs_growfs with the -n option (see discussion below).
OPTIONS -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 filesystem
-e Allows the real-time extent size to be specified. In mkfs.xfs(8) this is specified with -r extsize=nnnn.
-i 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 contin-
ues to be internal or external as it was before. [NOTE: These options are not implemented]
-m 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.
-n 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.
-t 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.
-V Prints the version number and exits. The mount-point argument is not required with -V.
xfs_growfs is most often used in conjunction with logical volumes (see md(4) and lvm(8) on Linux). However, it can also be used on a regu-
lar 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 manager.
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).
SEE ALSO mkfs.xfs(8), md(4), lvm(8), mount(8).