NAME

       pcp-dmcache, pcp-lvmcache - report on logical storage device caches

SYNOPSIS

       pcp dmcache [-i/--iops] [-R/--repeat N] [device ...]

DESCRIPTION

       pcp-dmcache  reports  on  the activity of any configured Device Mapper Cache targets.  The
       reported information includes device IOPs, cache and metadata device utilization, as  well
       as hit and miss rates and ratios for both reads and writes for each cache device.

       pcp-lvmcache  (Logical  Volume  Manager cache) is an exact synonym for pcp-dmcache (Device
       Mapper cache).

       When  invoked  via  the  pcp(1)  command,  the   -h/--host,   -a/--archive,   -O/--origin,
       -s/--samples,  -t/--interval,  -Z/--timezone  and  several other options become indirectly
       available.

       By default, pcp-dmcache reports on all available cache target devices (one line each,  per
       sample), but this can be restricted to specific devices on the command line.

OPTIONS

       Additional options are available for changing the output displayed by pcp-dmcache.

       -i/--iops displays total read and write operations instead of the default cache hit ratio.

       -R/--repeat changes the frequency at which the column heading is displayed.  By default, a
       header is displayed after every tenth sample.

SEE ALSO

       pcp(1), pmdadm(1), dmsetup(1), PCPIntro(1) and LVMCACHE(7).