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175 lines
5.3 KiB
Plaintext
175 lines
5.3 KiB
Plaintext
=head1 NAME
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vos_shadow - Creates a shadow copy of a volume on a different server/partition
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=head1 SYNOPSIS
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=for html
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<div class="synopsis">
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B<vos shadow> S<<< [B<-id>] <I<volume name or ID on source>> >>>
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S<<< [B<-fromserver>] <I<machine name on source>> >>>
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S<<< [B<-frompartition>] <I<partition name on source>> >>>
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S<<< [B<-toserver>] <I<machine name on destination>> >>>
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S<<< [B<-topartition>] <I<partition name on destination>> >>>
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S<<< [B<-toname> <I<volume name on destination>>] >>>
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S<<< [B<-toid> <I<volume ID on destination>>] >>> [B<-offline>] [B<-readonly>]
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[B<-live>] [B<-incremental>] S<<< [B<-cell> <I<cell name>>] >>> [B<-noauth>]
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[B<-localauth>] [B<-verbose>] [B<-encrypt>] [B<-help>]
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=for html
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</div>
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=head1 DESCRIPTION
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The B<vos shadow> command creates a shadow copy of a volume on a
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different partition or server.
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A shadow volume is a copy of a volume that does not normally appear in
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the volume location database (VLDB). It is a primitive operation that
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is meant to be used in backup or disaster recovery situations.
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=head1 CAUTIONS
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This command is not used during normal OpenAFS administration and may
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have adverse effects on the VLDB if not used properly! This command
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should only be used by an expert.
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Using this command on a volume when the source volume is not the same
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as parent volume used to create the shadow will leave the destination
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volume in a unknown state.
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Do NOT run the B<vos syncserv> or B<vos syncvldb> on any fileserver
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containing shadow volumes. This would update the VLDB to show all
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shadowed Read/Write volumes instead of the source volumes from which
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they were copied.
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Currently, the maximum size of a volume is 2 terabytes (2^31 bytes).
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=head1 OPTIONS
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=over 4
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=item [B<-id>] <I<volume name or ID>>
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Specifies either the complete name or volume ID number of a read/write
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volume.
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=item [B<-fromserver>] <I<machine name for source>>
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Identifies the file server machine where the source volume resides. Provide
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the machine's IP address or its host name (either fully qualified or using
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an unambiguous abbreviation). For details, see L<vos(1)>.
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=item [B<-frompartition>] <I<partition name for source>>
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Names the partition where the source volume resides. Provide the full
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partition name (for, example, B</vicepa>) or one of the abbreviated forms
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described in L<vos(1)>.
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=item [B<-toserver>] <I<machine name for destination>>
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Identifies the file server machine to which to copy the volume. Provide
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the machine's IP address or its host name (either fully qualified or using
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an unambiguous abbreviation). For details, see L<vos(1)>.
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=item [B<-topartition>] <I<partition name for destination>>
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Names the partition to which to copy the volume. Provide the full partition
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name (for, example, B</vicepa>) or one of the abbreviated forms described in
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L<vos(1)>.
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=item B<-toname> <I<volume name for new copy>>
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The complete name of the new volume to create.
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=item B<-offline>
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Leaves the new volume flagged as off-line in the volume database.
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=item B<-readonly>
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Flags the new volume as read-only in the volume database.
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=item B<-live>
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Copies the live volume without cloning. This is normally not necessary and
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causes the volume to be kept locked for longer than the normal copy
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mechanism.
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=item B<-incremental>
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Copy the changes from the source volume to a previously created shadow
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volume.
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=item B<-cell> <I<cell name>>
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Names the cell in which to run the command. Do not combine this argument
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with the B<-localauth> flag. For more details, see L<vos(1)>.
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=item B<-noauth>
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Assigns the unprivileged identity C<anonymous> to the issuer. Do not
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combine this flag with the B<-localauth> flag. For more details, see
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L<vos(1)>.
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=item B<-localauth>
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Constructs a server ticket using a key from the local
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F</usr/afs/etc/KeyFile> file. The B<vos> command interpreter presents
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it to the Volume Server and Volume Location Server during mutual
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authentication. Do not combine this flag with the B<-cell> argument or
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B<-noauth> flag. For more details, see L<vos(1)>.
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=item B<-verbose>
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Produces on the standard output stream a detailed trace of the command's
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execution. If this argument is omitted, only warnings and error messages
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appear.
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=item B<-encrypt>
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Encrypts the command so that the operation's results are not transmitted
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across the network in clear text.
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=item B<-help>
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Prints the online help for this command. All other valid options are
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ignored.
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=back
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=head1 OUTPUT
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This command has no output unless C<-verbose> is specified or there is
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an error.
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=head1 PRIVILEGE REQUIRED
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The issuer must be listed in the F</usr/afs/etc/UserList> file on the
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machines specified with the B<-toserver> and B<-fromserver> arguments and
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on each database server machine. If the B<-localauth> flag is included,
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the issuer must instead be logged on to a server machine as the local
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superuser C<root>.
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=head1 SEE ALSO
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L<vos(1)>,
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L<vos_backup(1)>,
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L<vos_copy(1)>,
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L<vos_move(1)>
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L<http://www.openafs.org/pipermail/openafs-info/2005-July/018469.html>
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discusses motivation for the creation of this command.
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L<http://workshop.openafs.org/afsbpw06/talks/drh.scs.html> discusses
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one possible use for it.
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=head1 COPYRIGHT
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Copyright 2008 Jason Edgecombe <jason@rampaginggeek.com>
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This documentation is covered by the BSD License as written in the
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doc/LICENSE file. This man page was written by Jason Edgecombe for
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OpenAFS.
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