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gconcat (8)
  • >> gconcat (8) ( FreeBSD man: Команды системного администрирования )

  • BSD mandoc
     

    NAME

    
    
    gconcat
    
     - disk concatenation control utility
    
     
    

    SYNOPSIS

    create [-v ] name prov ...
    destroy [-fv ] name ...
    label [-hv ] name prov ...
    stop [-fv ] name ...
    clear [-v ] prov ...
    dump prov ...
    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!
    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 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
    
     

    SEE ALSO

    geom(4), loader.conf5, geom(8), growfs(8), mount(8), newfs(8), sysctl(8), umount(8), vinum(8)  

    HISTORY

    The utility appeared in Fx 5.3 .  

    AUTHORS

    An Pawel Jakub Dawidek Aq [email protected]


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    SYSCTL VARIABLES
    EXIT STATUS
    EXAMPLES
    SEE ALSO
    HISTORY
    AUTHORS


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