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gconcat (8)
>> gconcat (8) ( FreeBSD man: Команды системного администрирования )
BSD mandoc
NAME
gconcat
- disk concatenation control utility
SYNOPSIS
create
[-v
]
nameprov ... destroy
[-fv
]
name ... label
[-hv
]
nameprov ... stop
[-fv
]
name ... clear
[-v
]
prov ... dumpprov ... list status load unload
DESCRIPTION
The
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 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
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 device'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!
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 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.
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
