# phpman > man > thin_trim(8)

[thin_trim(8)](https://www.chedong.com/phpMan.php/man/thintrim/8/markdown)                           System Manager's Manual                          [thin_trim(8)](https://www.chedong.com/phpMan.php/man/thintrim/8/markdown)



## NAME
       **thin**___**trim** - Issue discard requests for free pool space (offline tool).

## SYNOPSIS
       **thin**___**trim** [_options_] **--metadata-dev** {device|file} **--data-dev** {device|file}

## DESCRIPTION
       **thin**___**trim** sends discard requests to the pool device for unprovisioned areas.

       This tool cannot be run on live metadata.

## OPTIONS
### -h, --help
              Print help and exit.

### -V, --version
              Print version information and exit.

## SEE ALSO
       **thin**___**[dump**(8)](https://www.chedong.com/phpMan.php/man/dump/8/markdown), **thin**___**[repair**(8)](https://www.chedong.com/phpMan.php/man/repair/8/markdown), **thin**___**[restore**(8)](https://www.chedong.com/phpMan.php/man/restore/8/markdown), **thin**___**[rmap**(8)](https://www.chedong.com/phpMan.php/man/rmap/8/markdown), **thin**___**metadata**___**[size**(8)](https://www.chedong.com/phpMan.php/man/size/8/markdown)

## AUTHOR
       Joe Thornber <<ejt@redhat.com>>



System Manager's Manual                  Device Mapper Tools                            [thin_trim(8)](https://www.chedong.com/phpMan.php/man/thintrim/8/markdown)