man > xfs_info(8)

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 ar‐
       gument  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  undis‐
       turbed.

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)