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$FreeBSD: releng/11.0/sbin/geom/class/concat/gconcat.8 267667 2014-06-20 09:40:43Z bapt $
.Dd May 21, 2004 .Dt GCONCAT 8 .Os .Sh NAME .Nm gconcat .Nd "disk concatenation control utility" .Sh SYNOPSIS .Nm .Cm create .Op Fl v .Ar name .Ar prov ... .Nm .Cm destroy .Op Fl fv .Ar name ... .Nm .Cm label .Op Fl hv .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 .Nm .Cm load .Nm .Cm unload .Sh DESCRIPTION The .Nm utility is used for device concatenation configuration. The concatenation 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 concatenated 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.
p The first argument to .Nm indicates an action to be performed: l -tag -width ".Cm destroy" t Cm create Concatenate the given devices with specified .Ar name . This is the .Dq manual method. The kernel module
a geom_concat.ko will be loaded if it is not loaded already. t Cm label Concatenate 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
a geom_concat.ko will be loaded if it is not loaded already. t Cm stop Turn off existing concatenate device by its .Ar name . This command does not touch on-disk metadata! t Cm destroy Same as .Cm stop . t Cm clear Clear metadata on the given devices. t Cm dump Dump metadata stored on the given devices. t Cm list See .Xr geom 8 . t Cm status See .Xr geom 8 . t Cm load See .Xr geom 8 . t Cm unload See .Xr geom 8 . .El
p Additional options: l -tag -width indent t Fl f Force the removal of the specified concatenated device. t Fl h Hardcode providers' names in metadata. t 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 CONCAT GEOM class. The default value is shown next to each variable. l -tag -width indent t Va kern.geom.concat.debug : No 0 Debug level of the .Nm CONCAT 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 EXAMPLES The following example shows how to configure four disks for automatic concatenation, create a file system on it, and mount it: d -literal -offset indent gconcat label -v data /dev/da0 /dev/da1 /dev/da2 /dev/da3 newfs /dev/concat/data mount /dev/concat/data /mnt [...] umount /mnt gconcat stop data gconcat unload .Ed
p Configure concatenated provider on one disk only. Create file system. Add two more disks and extend existing file system. d -literal -offset indent gconcat label data /dev/da0 newfs /dev/concat/data gconcat label data /dev/da0 /dev/da1 /dev/da2 growfs /dev/concat/data .Ed .Sh SEE ALSO .Xr geom 4 , .Xr loader.conf 5 , .Xr geom 8 , .Xr growfs 8 , .Xr gvinum 8 , .Xr mount 8 , .Xr newfs 8 , .Xr sysctl 8 , .Xr umount 8 .Sh HISTORY The .Nm utility appeared in .Fx 5.3 . .Sh AUTHORS .An Pawel Jakub Dawidek Aq Mt pjd@FreeBSD.org