\# Text automatically generated by txt2man
.TH cache_metadata_size 8 "Device Mapper Tools" "System Manager's Manual"
.SH NAME
\fBcache_metadata_size \fP- Estimate the size of the metadata device needed for a given configuration.
\fB
.SH SYNOPSIS
.nf
.fam C
\fBcache_metadata_size\fP [\fIoptions\fP]
.fam T
.fi
.SH DESCRIPTION
.TP
.B
\fBcache_metadata_size\fP estimates the size of the metadata.
Either \fB--nr-blocks\fP,
or \fB--block-size\fP and \fB--device-size\fP must be specified.
.SH OPTIONS
.TP
.B
\fB--nr-blocks\fP {natural}
Specify the number of cache blocks.
.TP
.B
\fB--block-size\fP {sectors}
Specify the size of each cache block in 512 byte sectors.
.TP
.B
\fB--device-size\fP {sectors}
Specify total size of the fast device used in the cache.  In 512 byte sectors.
.TP
.B
\fB--max-hint-width\fP {nr bytes}
Specify hint width.
.PP
.nf
.fam C
    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.

.fam T
.fi
.SH EXAMPLE
$ \fBcache_metadata_size\fP \fB--nr-blocks\fP 10240
.PP
$ \fBcache_metadata_size\fP \fB--block-size\fP 128 \fB--device-size\fP 1024000
.SH SEE ALSO
\fBcache_dump\fP(8), \fBcache_repair\fP(8), \fBcache_restore\fP(8)
.SH AUTHOR
Joe Thornber <ejt@redhat.com>, Heinz Mauelshagen <heinzm@redhat.com>