NAME
vos_clone - Creates a shared-space copy of a volume on a partition
SYNOPSIS
vos clone [-id] <volume name or ID>
[-server] <server name>
[-partition] <partition name>
[-toname <volume name on destination>]
[-toid <volume ID on destination>] [-offline] [-readonly]
[-cell <cell name>] [-noauth]
[-localauth] [-verbose] [-encrypt] [-help]
DESCRIPTION
The vos clone command creates a copy-on-write copy of a volume on the
same partition and server ass the parent volume.
A clone is a copy of a volume that does only stores the changes from
the parent volume. Cloning is a primitive operation that is used by the
vos move, vos backup, and vos release commands. A clone functions using
the same mechanism as a backup volume, but it is persistent. Clone
volumes can be used as point-in-time copies of the parent vollume, but
they must be used with care.
CAUTIONS
This command is not used during normal OpenAFS administration and may
have adverse effects on the VLDB if not used properly! This command
should only be used by an expert.
Deleting or moving the parent volume makes the clone volume
inaccessible, but the clone volume remains in the VLDB and on disk, and
it needs to be cleaned up manually.
There is a maximum limitation of 7 clones when using the namei
fileserver. You may safely create up to 4 clones using the vos clone
command. The other three clone slots are used by the backup volume, a
read-only replica and the temporary clone that is created when
executing a vos move, vos dump, or other vos commands.
Some commands do not work properly on clone volumes. vos move is one
such command.
Currently, the maximum size of a volume is 2 terabytes (2^31 bytes).
OPTIONS
[-id] <volume name or ID>
Specifies either the complete name or volume ID number of a
read/write volume.
[-server] <machine name>
Identifies the file server machine where the source volume resides.
Provide the machine’s IP address or its host name (either fully
qualified or using an unambiguous abbreviation). For details, see
vos(1).
[-partition] <partition name>
Names the partition where the source volume resides. Provide the
full partition name (for, example, /vicepa) or one of the
abbreviated forms described in vos(1).
-toname <volume name for new copy>
The complete name of the new volume to create.
-toid <volume id for new copy>
The complete id of the new volume to create.
-offline
Leaves the new volume flagged as off-line in the volume database.
-readonly
Flags the new volume as read-only in the volume database.
-cell <cell name>
Names the cell in which to run the command. Do not combine this
argument with the -localauth flag. For more details, see vos(1).
-noauth
Assigns the unprivileged identity "anonymous" to the issuer. Do not
combine this flag with the -localauth flag. For more details, see
vos(1).
-localauth
Constructs a server ticket using a key from the local
/etc/openafs/server/KeyFile file. The vos command interpreter
presents it to the Volume Server and Volume Location Server during
mutual authentication. Do not combine this flag with the -cell
argument or -noauth flag. For more details, see vos(1).
-verbose
Produces on the standard output stream a detailed trace of the
command’s execution. If this argument is omitted, only warnings and
error messages appear.
-encrypt
Encrypts the command so that the operation’s results are not
transmitted across the network in clear text.
-help
Prints the online help for this command. All other valid options
are ignored.
OUTPUT
This command has no output unless "-verbose" is specified or there is
an error.
PRIVILEGE REQUIRED
The issuer must be listed in the /etc/openafs/server/UserList file on
the machines specified with the -toserver and -fromserver arguments and
on each database server machine. If the -localauth flag is included,
the issuer must instead be logged on to a server machine as the local
superuser "root".
SEE ALSO
vos(1), vos_backup(1), vos_copy(1), vos_move(1), vos_shadow(1)
COPYRIGHT
Copyright 2008 Jason Edgecombe <jason@rampaginggeek.com>
This documentation is covered by the BSD License as written in the
doc/LICENSE file. This man page was written by Jason Edgecombe for
OpenAFS.