ggatel(8) [freebsd man page]

GGATEL(8)						    BSD System Manager's Manual 						 GGATEL(8)

NAME

     ggatel -- GEOM Gate local control utility

SYNOPSIS

     ggatel create [-v] [-o ro | wo | rw] [-s sectorsize] [-t timeout] [-u unit] path
     ggatel attach [-v] [-o ro | wo | rw] -u unit path
     ggatel destroy [-f] -u unit
     ggatel list [-v] [-u unit]

DESCRIPTION

     The ggatel utility is a local GEOM Gate class consumer.  It can be used as a replacement for md(4) devices or as a ``GEOMificator'' for non
     GEOM-aware devices, but it was mainly created as an example on how to use and how to communicate with the GEOM Gate kernel module.

     Available commands:

     create   Create a ggate provider related to the given regular file or device.

     attach   Attach a worker process to an existing ggate provider.

     destroy  Destroy the given ggate provider.

     list     List ggate providers.

     Available options:

     -f 	      Forcibly destroy ggate provider (cancels all pending requests).

     -o ro | wo | rw  Specify permission to use when opening the file or device: read-only (ro), write-only (wo), or read-write (rw).  Default is
		      rw.

     -s sectorsize    Sector size for ggate provider.  If not specified, it is taken from device, or set to 512 bytes for files.

     -t timeout       Number of seconds to wait before an I/O request will be canceled.  0 means no timeout.  Default is 30.

     -u unit	      Unit number to use.

     -v 	      Do not fork, run in foreground and print debug informations on standard output.

     path	      Path to a regular file or device.

EXIT STATUS

     Exit status is 0 on success, or 1 if the command fails.  To get details about the failure, ggatel should be called with the -v option.

EXAMPLES

     ``GEOMify'' the ``fd0'' device and use gbde(8) to encrypt data on a floppy.

	   ggatel create -u 5 /dev/fd0
	   gbde init /dev/ggate5
	   gbde attach ggate5
	   newfs /dev/ggate5.bde
	   mount /dev/ggate5.bde /secret
	   cp /private/foo /secret/
	   umount /secret
	   gbde detach ggate5
	   ggatel destroy -u 5

SEE ALSO

     geom(4), gbde(8), ggatec(8), ggated(8), mount(8), newfs(8)

AUTHORS

     The ggatel utility as well as this manual page was written by Pawel Jakub Dawidek <pjd@FreeBSD.org>.

BSD
								   April 2, 2011							       BSD

GSCHED(8)						    BSD System Manager's Manual 						 GSCHED(8)

NAME

     gsched -- control utility for disk scheduler GEOM class

SYNOPSIS

     gsched create [-v] [-a algorithm] provider ...
     gsched insert [-v] [-a algorithm] provider ...
     gsched configure [-v] [-a algorithm] node ...
     gsched destroy [-fv] node ...
     gsched reset [-v] node ...
     gsched { list | status | load | unload }

DESCRIPTION

     The gsched utility (also callable as geom sched ...) changes the scheduling policy of the requests going to a provider.

     The first argument to gsched indicates an action to be performed:

     create	Create a new provider and geom node using the specified scheduling algorithm.  algorithm is the name of the scheduling algorithm
		used for the provider.	Available algorithms include: rr, which implements anticipatory scheduling with round robin service among
		clients; as, which implements a simple form of anticipatory scheduling with no per-client queue.

		If the operation succeeds, the new provider should appear with name /dev/<dev>.sched..	The kernel module geom_sched.ko will be
		loaded if it is not loaded already.

     insert	Operates as "create", but the insertion is "transparent", i.e. the existing provider is rerouted to the newly created geom, which
		in turn forwards requests to the existing geom.  This operation allows one to start/stop a scheduling service on an already exist-
		ing provider.

		A subsequent "destroy" will remove the newly created geom and hook the provider back to the original geom.

     configure	Configure existing scheduling provider.  It supports the same options as the create command.

     destroy	Destroy the geom specified in the parameter.

     reset	Do nothing.

     list | status | load | unload
		See geom(8).

     Additional options:

     -f  Force the removal of the specified provider.

     -v  Be more verbose.

SYSCTL VARIABLES

     The following sysctl(8) variables can be used to control the behavior of the SCHED GEOM class.  The default value is shown next to each vari-
     able.

     kern.geom.sched.debug: 0
	     Debug level of the SCHED GEOM class.  This can be set to a number between 0 and 2 inclusive.  If set to 0 minimal debug information
	     is printed, and if set to 2 the maximum amount of debug information is printed.

EXIT STATUS

     Exit status is 0 on success, and 1 if the command fails.

EXAMPLES

     The following example shows how to create a scheduling provider for disk /dev/ada0, and how to destroy it.

	   # Load the geom_sched module:
	   kldload geom_sched
	   # Load some scheduler classes used by geom_sched:
	   kldload gsched_rr
	   # Configure device ada0 to use scheduler "rr":
	   geom sched insert -a rr ada0
	   # Now provider ada0 uses the "rr" algorithm;
	   # the new geom is ada0.sched.
	   # Remove the scheduler on the device:
	   geom sched destroy -v ada0.sched.

SEE ALSO

     geom(4), geom(8)

HISTORY

     The gsched utility first appeared in FreeBSD 8.1.

AUTHORS

     Fabio Checconi <fabio@FreeBSD.org>
     Luigi Rizzo <luigi@FreeBSD.org>

BSD
								   July 26, 2012							       BSD