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GCONCAT(8) BSD System Manager's Manual GCONCAT(8) NAME gconcat -- disk concatenation control utility SYNOPSIS gconcat create [-v] name prov ... gconcat destroy [-fv] name ... gconcat label [-hv] name prov ... gconcat stop [-fv] name ... gconcat clear [-v] prov ... gconcat dump prov ... gconcat list gconcat status gconcat load gconcat unload DESCRIPTION The gconcat utility is used for device concatenation configuration. The concatenation can be configured using two different methods: "manual" or "automatic". When using the "manual" method, no metadata are stored on the devices, so the concatenated device has to be configured by hand ev- ery time it is needed. The "automatic" method uses on-disk metadata to detect devices. Once devices are labeled, they will be automatically de- tected and configured. The first argument to gconcat indicates an action to be performed: create Concatenate the given devices with specified name. This is the "manual" method. The kernel module geom_concat.ko will be loaded if it is not loaded already. label Concatenate the given devices with the specified name. This is the "automatic" method, where metadata are stored in every de- vice's last sector. The kernel module geom_concat.ko will be loaded if it is not loaded already. stop Turn off existing concatenate 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 concatenated device. -h Hardcode providers' names in metadata. -v Be more verbose. SYSCTL VARIABLES The following sysctl(8) variables can be used to control the behavior of the CONCAT GEOM class. The default value is shown next to each variable. kern.geom.concat.debug: 0 Debug level of the CONCAT 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. EXIT STATUS Exit status is 0 on success, and 1 if the command fails. EXAMPLES The following example shows how to configure four disks for automatic concatenation, create a file system on it, and mount it: 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 Configure concatenated provider on one disk only. Create file system. Add two more disks and extend existing file system. gconcat label data /dev/da0 newfs /dev/concat/data gconcat label data /dev/da0 /dev/da1 /dev/da2 growfs /dev/concat/data SEE ALSO geom(4), loader.conf(5), geom(8), growfs(8), gvinum(8), mount(8), newfs(8), sysctl(8), umount(8) HISTORY The gconcat utility appeared in FreeBSD 5.3. AUTHORS Pawel Jakub Dawidek <pjd@FreeBSD.org> BSD May 21, 2004 BSD
NAME | SYNOPSIS | DESCRIPTION | SYSCTL VARIABLES | EXIT STATUS | EXAMPLES | SEE ALSO | HISTORY | AUTHORS
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