cache_metadata_size
Section: Maintenance Commands (8)
Updated: Device Mapper Tools
Page Index
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>