xfs_info(8) System Manager's Manual xfs_info(8)
NAME
xfs_info - display XFS filesystem geometry information
SYNOPSIS
xfs_info [ -t mtab ] [ mount-point | block-device | file-image ]
xfs_info -V
DESCRIPTION
xfs_info displays geometry information about an existing XFS filesystem.
The mount-point argument is the pathname of a directory where the
filesystem is mounted. The block-device or file-image contain a raw XFS
filesystem. The existing contents of the filesystem are undisturbed.
OPTIONS
-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. This option has no effect with the
block-device or file-image parameters.
-V Prints the version number and exits. The mount-point argument is
not required with -V.
EXAMPLES
Understanding xfs_info output.
Suppose one has the following "xfs_info /dev/sda" output:
meta-data=/dev/pmem0 isize=512 agcount=8, agsize=5974144 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=1, sparse=1, rmapbt=1
= reflink=1
data = bsize=4096 blocks=47793152, imaxpct=25
= sunit=32 swidth=128 blks
naming =version 2 bsize=4096 ascii-ci=0, ftype=1
log =internal log bsize=4096 blocks=23336, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 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).
xfs_info(8)
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