NAME¶
pcp-dmcache - report on Device Mapper Cache devices
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.
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) and
PCPIntro(1).