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-.\"-
-.\" Copyright (c) 2010 Edward Tomasz Napierala
-.\" All rights reserved.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\" 1. Redistributions of source code must retain the above copyright
-.\"    notice, this list of conditions and the following disclaimer.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice, this list of conditions and the following disclaimer in the
-.\"    documentation and/or other materials provided with the distribution.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
-.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
-.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
-.\" SUCH DAMAGE.
-.\"
-.\" $FreeBSD$
-.\"
-.Dd January 3, 2010
-.Dt GCACHE 8
-.Os
-.Sh NAME
-.Nm gcache
-.Nd "control utility for CACHE GEOM class"
-.Sh SYNOPSIS
-.Nm
-.Cm create
-.Op Fl v
-.Op Fl b Ar blocksize
-.Op Fl s Ar size
-.Ar name
-.Ar prov
-.Nm
-.Cm configure
-.Op Fl v
-.Op Fl b Ar blocksize
-.Op Fl s Ar size
-.Ar name
-.Nm
-.Cm destroy
-.Op Fl fv
-.Ar name
-.Nm
-.Cm label
-.Op Fl v
-.Op Fl b Ar blocksize
-.Op Fl s Ar size
-.Ar name
-.Ar prov
-.Nm
-.Cm stop
-.Op Fl fv
-.Ar name ...
-.Nm
-.Cm clear
-.Op Fl v
-.Ar prov ...
-.Nm
-.Cm dump
-.Ar prov ...
-.Nm
-.Cm list
-.Nm
-.Cm status
-.Op Fl s Ar name
-.Nm
-.Cm load
-.Op Fl v
-.Nm
-.Cm unload
-.Op Fl v
-.Sh DESCRIPTION
-The
-.Nm
-utility is used to control GEOM cache, which can
-speed up read performance by sending fixed size
-read requests to its consumer.  It has been developed to address
-the problem of a horrible read performance of a 64k blocksize FS
-residing on a RAID3 array with 8 data components, where a single
-disk component would only get 8k read requests, thus effectively
-killing disk performance under high load.
-.Pp
-Caching can be configured using two different methods:
-.Dq manual
-or
-.Dq automatic .
-When using the
-.Dq manual
-method, no metadata are stored on the devices, so the cached
-device has to be configured by hand every time it is needed.
-The
-.Dq automatic
-method uses on-disk metadata to detect devices.
-Once devices are labeled, they will be automatically detected and
-configured.
-.Pp
-The first argument to
-.Nm
-indicates an action to be performed:
-.Bl -tag -width ".Cm destroy"
-.It Cm create
-Cache the given devices with specified
-.Ar name .
-This is the
-.Dq manual
-method.
-The kernel module
-.Pa geom_cache.ko
-will be loaded if it is not loaded already.
-.It Cm label
-Cache the given devices with the specified
-.Ar name .
-This is the
-.Dq automatic
-method, where metadata are stored in every device's last sector.
-The kernel module
-.Pa geom_cache.ko
-will be loaded if it is not loaded already.
-.It Cm stop
-Turn off existing cache device by its
-.Ar name .
-This command does not touch on-disk metadata!
-.It Cm destroy
-Same as
-.Cm stop .
-.It Cm clear
-Clear metadata on the given devices.
-.It Cm dump
-Dump metadata stored on the given devices.
-.It Cm list
-See
-.Xr geom 8 .
-.It Cm status
-See
-.Xr geom 8 .
-.It Cm load
-See
-.Xr geom 8 .
-.It Cm unload
-See
-.Xr geom 8 .
-.El
-.Pp
-Additional options:
-.Bl -tag -width indent
-.It Fl f
-Force the removal of the specified cache device.
-.It Fl v
-Be more verbose.
-.El
-.Sh SYSCTL VARIABLES
-The following
-.Xr sysctl 8
-variables can be used to control the behavior of the
-.Nm CACHE
-GEOM class.
-The default value is shown next to each variable.
-.Bl -tag -width indent
-.It Va kern.geom.cache.used_hi : No 20
-.It Va kern.geom.cache.used_lo : No 5
-.It Va kern.geom.cache.idletime : No 5
-.It Va kern.geom.cache.timeout : No 10
-.It Va kern.geom.cache.enable : No 1
-.It Va kern.geom.cache.debug : No 0
-Debug level of the
-.Nm CACHE
-GEOM class.
-This can be set to a number between 0 and 3 inclusive.
-If set to 0 minimal debug information is printed, and if set to 3 the
-maximum amount of debug information is printed.
-.El
-.Sh EXIT STATUS
-Exit status is 0 on success, and 1 if the command fails.
-.Sh SEE ALSO
-.Xr geom 4 ,
-.Xr geom 8
-.Sh HISTORY
-The
-.Nm
-utility appeared in
-.Fx 7.0 .
-.Sh AUTHORS
-.An Ruslan Ermilov Aq Mt ru@FreeBSD.org