NAME¶

cache_metadata_size - Estimate the size of the metadata device needed for a given configuration.

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), cache_repair(8), cache_restore(8)

AUTHOR¶

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