cache_metadata_size.8

cache_metadata_size

NAME
SYNOPSIS
DESCRIPTION
OPTIONS
EXAMPLE
SEE ALSO
AUTHOR

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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>

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