cache_metadata_size (8) Linux Manual Page

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 [at] redhat.com>, Heinz Mauelshagen <heinzm [at] redhat.com>