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NAME

       vos_shadow - Creates a shadow copy of a volume on a different
       server/partition

SYNOPSIS

       vos shadow [-id] <volume name or ID on source>
           [-fromserver] <machine name on source>
           [-frompartition] <partition name on source>
           [-toserver] <machine name on destination>
           [-topartition] <partition name on destination>
           [-toname <volume name on destination>]
           [-toid <volume ID on destination>] [-offline] [-readonly]
           [-live] [-incremental] [-cell <cell name>] [-noauth]
           [-localauth] [-verbose] [-encrypt] [-help]

DESCRIPTION

       The vos shadow command creates a shadow copy of a volume on a different
       partition or server.

       A shadow volume is a copy of a volume that does not normally appear in
       the volume location database (VLDB). It is a primitive operation that
       is meant to be used in backup or disaster recovery situations.

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.

       Using this command on a volume when the source volume is not the same
       as parent volume used to create the shadow will leave the destination
       volume in a unknown state.

       Do NOT run the vos syncserv or vos syncvldb on any fileserver
       containing shadow volumes. This would update the VLDB to show all
       shadowed Read/Write volumes instead of the source volumes from which
       they were copied.

       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.

       [-fromserver] <machine name for source>
           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).

       [-frompartition] <partition name for source>
           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).

       [-toserver] <machine name for destination>
           Identifies the file server machine to which to copy the volume.
           Provide the machine’s IP address or its host name (either fully
           qualified or using an unambiguous abbreviation). For details, see
           vos(1).

       [-topartition] <partition name for destination>
           Names the partition to which to copy the volume. 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.

       -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.

       -live
           Copies the live volume without cloning.  This is normally not
           necessary and causes the volume to be kept locked for longer than
           the normal copy mechanism.

       -incremental
           Copy the changes from the source volume to a previously created
           shadow volume.

       -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)

       <http://www.openafs.org/pipermail/openafs-info/2005-July/0184.html>
       discusses motivation for the creation of this command.

       <http://workshop.openafs.org/afsbpw06/talks/drh.scs.html> discusses one
       possible use for it.

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.