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GSTRIPE(8)		FreeBSD	System Manager's Manual		    GSTRIPE(8)

     gstripe --	control	utility	for striped devices

     gstripe create [-v] [-s stripesize] name prov prov	...
     gstripe destroy [-fv] name	...
     gstripe label [-hv] [-s stripesize] name prov prov	...
     gstripe stop [-fv]	name ...
     gstripe clear [-v]	prov ...
     gstripe dump prov ...
     gstripe list
     gstripe status
     gstripe load
     gstripe unload

     The gstripe utility is used for setting up	a stripe on two	or more	disks.
     The striped device	can be configured using	two different methods:
     ``manual''	or ``automatic''.  When	using the ``manual'' method, no	meta-
     data are stored on	the devices, so	the striped device has to be config-
     ured by hand every	time it	is needed.  The	``automatic'' method uses on-
     disk metadata to detect devices.  Once devices are	labeled, they will be
     automatically detected and	configured.

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

     create   Set up a striped device from the given devices with specified
	      name.  This is the ``manual'' method and the stripe will not
	      exist after a reboot (see	DESCRIPTION above).  The kernel	module
	      geom_stripe.ko will be loaded if it is not loaded	already.

     label    Set up a striped device from the given devices with the speci-
	      fied name.  This is the ``automatic'' method, where metadata are
	      stored in	every device's last sector.  The kernel	module
	      geom_stripe.ko will be loaded if it is not loaded	already.

     stop     Turn off an existing striped device by its name.	This command
	      does not touch on-disk metadata!

     destroy  Same as stop.

     clear    Clear metadata on	the given devices.

     dump     Dump metadata stored on the given	devices.

     list     See geom(8).

     status   See geom(8).

     load     See geom(8).

     unload   See geom(8).

     Additional	options:

     -f		    Force the removal of the specified striped device.

     -h		    Hardcode providers'	names in metadata.

     -s	stripesize  Specifies size of stripe block in bytes.  The stripesize
		    must be a multiple of the largest sector size of all the

     -v		    Be more verbose.

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

     kern.geom.stripe.debug: 0
	     Debug level of the	STRIPE GEOM class.  This can be	set to a num-
	     ber between 0 and 3 inclusive.  If	set to 0 minimal debug infor-
	     mation is printed,	and if set to 3	the maximum amount of debug
	     information is printed. 0
	     If	set to a non-zero value	enable ``fast mode'' instead of	the
	     normal ``economic mode''.	Compared to ``economic mode'', ``fast
	     mode'' uses more memory, but it is	much faster for	smaller	stripe
	     sizes.  If	enough memory cannot be	allocated, STRIPE will fall
	     back to ``economic	mode''.

     kern.geom.stripe.maxmem: 13107200
	     Maximum amount of memory that can be consumed by ``fast mode''
	     (in bytes).  This sysctl(8) variable is read-only and can only be
	     set as a tunable in loader.conf(5).

	     A count of	how many times ``fast mode'' has failed	due to an
	     insufficient amount of memory.  If	this value is large, you
	     should consider increasing	the kern.geom.stripe.maxmem value.

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

     The following example shows how to	set up a striped device	from four
     disks with	a 128KB	stripe size for	automatic configuration, create	a file
     system on it, and mount it:

	   gstripe label -v -s 131072 data /dev/da0 /dev/da1 /dev/da2 /dev/da3
	   newfs /dev/stripe/data
	   mount /dev/stripe/data /mnt
	   umount /mnt
	   gstripe stop	data
	   gstripe unload

     The gstripe interleave is in number of bytes, unlike ccdconfig(8) and
     atacontrol(8) which use the number	of sectors.  A ccdconfig(8) ileave of
     `128' is 64 KB (128 512B sectors).	 The same stripe interleave would be
     specified as `65536' for gstripe.

     geom(4), loader.conf(5), atacontrol(8), ccdconfig(8), geom(8), mount(8),
     newfs(8), sysctl(8), umount(8), vinum(8)

     The gstripe utility appeared in FreeBSD 5.3.

     Pawel Jakub Dawidek <>

FreeBSD	8.3			 May 21, 2004			   FreeBSD 8.3


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