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83ccb62012
Change the 'vos shadow' man page to say that updating the VLDB with shadow volumes does only work if the VLDB entries for the corresponding source volumes are deleted first. Change-Id: I2764776b7a03346b5b2809f796d1deed0c32933b Reviewed-on: http://gerrit.openafs.org/8652 Tested-by: BuildBot <buildbot@rampaginggeek.com> Reviewed-by: Dan van der Ster <daniel.vanderster@cern.ch> Tested-by: Dan van der Ster <daniel.vanderster@cern.ch> Reviewed-by: Ken Dreyer <ktdreyer@ktdreyer.com>
197 lines
6.2 KiB
Plaintext
197 lines
6.2 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>>] >>>
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[B<-offline>] [B<-readonly>] [B<-live>] [B<-incremental>]
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S<<< [B<-cell> <I<cell name>>] >>>
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[B<-noauth>] [B<-localauth>]
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[B<-verbose>] [B<-encrypt>] [B<-noresolve>] [B<-help>]
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B<vos sh> S<<< [B<-id>] <I<volume name or ID on source>> >>>
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S<<< [B<-froms>] <I<machine name on source>> >>>
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S<<< [B<-fromp>] <I<partition name on source>> >>>
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S<<< [B<-tos>] <I<machine name on destination>> >>>
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S<<< [B<-top>] <I<partition name on destination>> >>>
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S<<< [B<-ton> <I<volume name on destination>>] >>>
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S<<< [B<-toi> <I<volume ID on destination>>] >>>
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[B<-o>] [B<-r>] [B<-l>] [B<-in>]
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S<<< [B<-c> <I<cell name>>] >>>
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[B<-noa>] [B<-lo>] [B<-v>] [B<-e>] [B<-nor>] [B<-h>]
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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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Running B<vos syncserv> or B<vos syncvldb> on a fileserver containing
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shadow volumes will not update the VLDB with the shadowed Read/Write
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volumes as long as the entries for the source volumes still exist. In
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a disaster recovery situation the VLDB entries for the corresponding
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source volumes need hence to be deleted first.
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=include fragments/volsize-caution.pod
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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. This option is available in OpenAFS
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versions 1.4.11 or later and 1.5.60 or later.
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=item B<-noresolve>
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Shows all servers as IP addresses instead of the DNS name. This is very
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useful when the server address is registered as 127.0.0.1 or when dealing
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with multi-homed servers. This option is available in OpenAFS
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versions 1.4.8 or later and 1.5.35 or later.
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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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