=head1 NAME vos_shadow - Creates a shadow copy of a volume on a different server/partition =head1 SYNOPSIS =for html
B S<<< [B<-id>] > >>> S<<< [B<-fromserver>] > >>> S<<< [B<-frompartition>] > >>> S<<< [B<-toserver>] > >>> S<<< [B<-topartition>] > >>> S<<< [B<-toname> >] >>> S<<< [B<-toid> >] >>> [B<-offline>] [B<-readonly>] [B<-live>] [B<-incremental>] S<<< [B<-cell> >] >>> [B<-noauth>] [B<-localauth>] [B<-verbose>] [B<-encrypt>] [B<-noresolve>] [B<-help>] B S<<< [B<-id>] > >>> S<<< [B<-froms>] > >>> S<<< [B<-fromp>] > >>> S<<< [B<-tos>] > >>> S<<< [B<-top>] > >>> S<<< [B<-ton> >] >>> S<<< [B<-toi> >] >>> [B<-o>] [B<-r>] [B<-l>] [B<-in>] S<<< [B<-c> >] >>> [B<-noa>] [B<-lo>] [B<-v>] [B<-e>] [B<-nor>] [B<-h>] =for html
=head1 DESCRIPTION The B 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. =head1 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 B or B 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). =head1 OPTIONS =over 4 =item [B<-id>] > Specifies either the complete name or volume ID number of a read/write volume. =item [B<-fromserver>] > 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 L. =item [B<-frompartition>] > Names the partition where the source volume resides. Provide the full partition name (for, example, B) or one of the abbreviated forms described in L. =item [B<-toserver>] > 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 L. =item [B<-topartition>] > Names the partition to which to copy the volume. Provide the full partition name (for, example, B) or one of the abbreviated forms described in L. =item B<-toname> > The complete name of the new volume to create. =item B<-offline> Leaves the new volume flagged as off-line in the volume database. =item B<-readonly> Flags the new volume as read-only in the volume database. =item B<-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. =item B<-incremental> Copy the changes from the source volume to a previously created shadow volume. =item B<-cell> > Names the cell in which to run the command. Do not combine this argument with the B<-localauth> flag. For more details, see L. =item B<-noauth> Assigns the unprivileged identity C to the issuer. Do not combine this flag with the B<-localauth> flag. For more details, see L. =item B<-localauth> Constructs a server ticket using a key from the local F file. The B command interpreter presents it to the Volume Server and Volume Location Server during mutual authentication. Do not combine this flag with the B<-cell> argument or B<-noauth> flag. For more details, see L. =item B<-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. =item B<-encrypt> Encrypts the command so that the operation's results are not transmitted across the network in clear text. This option is available in OpenAFS versions 1.4.11 or later and 1.5.60 or later. =item B<-noresolve> Shows all servers as IP addresses instead of the DNS name. This is very useful when the server address is registered as 127.0.0.1 or when dealing with multi-homed servers. This option is available in OpenAFS versions 1.4.8 or later and 1.5.35 or later. =item B<-help> Prints the online help for this command. All other valid options are ignored. =back =head1 OUTPUT This command has no output unless C<-verbose> is specified or there is an error. =head1 PRIVILEGE REQUIRED The issuer must be listed in the F file on the machines specified with the B<-toserver> and B<-fromserver> arguments and on each database server machine. If the B<-localauth> flag is included, the issuer must instead be logged on to a server machine as the local superuser C. =head1 SEE ALSO L, L, L, L L discusses motivation for the creation of this command. L discusses one possible use for it. =head1 COPYRIGHT Copyright 2008 Jason Edgecombe 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.