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    The following form allows you to view linux man pages.

    Command:

    fstrim

    
    
    

    SYNOPSIS

           fstrim [-o offset] [-l length] [-m minimum-free-extent] [-v] mountpoint
    
    
    

    DESCRIPTION

           fstrim is used on a mounted filesystem to discard  (or  "trim")  blocks
           which are not in use by the filesystem.  This is useful for solid-state
           drives (SSDs) and thinly-provisioned storage.
    
           By default, fstrim will discard all unused blocks  in  the  filesystem.
           Options  may be used to modify this behavior based on range or size, as
           explained below.
    
           The mountpoint argument is the pathname  of  the  directory  where  the
           filesystem is mounted.
    
    
    

    OPTIONS

           The  offset,  length, and minimum-free-extent arguments may be followed
           by binary (2^N) suffixes KiB, MiB, GiB, TiB, PiB and EiB (the  "iB"  is
           optional,  e.g.  "K"  has  the same meaning as "KiB") or decimal (10^N)
           suffixes KB, MB, GB, PB and EB.
    
           -h, --help
                  Print help and exit.
    
           -o, --offset offset
                  Byte offset in filesystem from which to begin searching for free
                  blocks  to  discard.   Default  value  is  zero, starting at the
                  beginning of the filesystem.
    
           -l, --length length
                  Number of bytes after starting point to search for  free  blocks
                  to  discard.  If the specified value extends past the end of the
                  filesystem, fstrim will stop at the  filesystem  size  boundary.
                  Default value extends to the end of the filesystem.
    
           -m, --minimum minimum-free-extent
                  Minimum  contiguous free range to discard, in bytes. (This value
                  is internally rounded up to a multiple of the  filesystem  block
                  size).   Free  ranges  smaller  than  this  will be ignored.  By
                  increasing this value, the fstrim operation will  complete  more
                  quickly   for   filesystems  with  badly  fragmented  freespace,
                  although not all blocks will be  discarded.   Default  value  is
                  zero, discard every free block.
    
           -v, --verbose
                  Verbose  execution. When specified fstrim will output the number
                  of bytes passed from the filesystem down the block stack to  the
                  device  for  potential discard. This number is a maximum discard
                  amount from the storage  device's  perspective,  because  FITRIM
                  ioctl  called  repeated  will  keep sending the same sectors for
    
    
    

    SEE ALSO

           mount(8)
    
    
    

    AVAILABILITY

           The fstrim command is part of the util-linux-ng package and  is  avail-
           able from ftp://ftp.kernel.org/pub/linux/utils/util-linux-ng/.
    
                                       Nov 2010                          FSTRIM(8)
    
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