xfs_info(8) - phpMan

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 filesys-
       tem.  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  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)