# cache_metadata_size(8) - man - phpMan

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



## NAME
       **cache**___**metadata**___**size**  - Estimate the size of the metadata device needed for a given configura‐
       tion.

## SYNOPSIS
       **cache**___**metadata**___**size** [_options_]

## DESCRIPTION
       **cache**___**metadata**___**size** **estimates** **the** **size** **of** **the** **metadata.**
              Either **--nr-blocks**, or **--block-size** and **--device-size** must be specified.

## OPTIONS
### --nr-blocks {natural}
              Specify the number of cache blocks.

### --block-size {sectors}
              Specify the size of each cache block in 512 byte sectors.

### --device-size {sectors}
              Specify total size of the fast device used in the cache.  In 512 byte sectors.

### --max-hint-width {nr bytes}
              Specify hint width.

           Cache policies use a per block 'hint' to record extra info (for instance
           hit counts).  At the moment all policies use a 4 byte hint
           width.  If you want to use a different hint width specify it with this
           switch.


## EXAMPLE
       $ **cache**___**metadata**___**size** **--nr-blocks** 10240

       $ **cache**___**metadata**___**size** **--block-size** 128 **--device-size** 1024000

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

## AUTHOR
       Joe Thornber <<ejt@redhat.com>>, Heinz Mauelshagen <<heinzm@redhat.com>>



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