=head1 NAME

backup restoredb - Restores a saved copy of the Backup Database

=head1 SYNOPSIS

backup restoredb [B<-portoffset> I<TC port offset>]
[B<-localauth>]  [B<-cell> I<cell name>]  [B<-help>]

backup res [B<-p> I<TC port offset>]  [B<-l>]  [B<-c> I<cell name>]  [B<-h>]

=head1 DESCRIPTION

The C<backup restoredb> command restores to the Backup Server machine's
local disk a version of the Backup Database previously written to tape
by using the C<backup savedb> command.

(If the B<FILE YES> instruction appears in the
B</usr/afs/backup/CFG_>I<device_name> file associated with the specified
port offset, then the C<backup restoredb> command restores data from the
backup data file listed for that port offset in the Tape Coordinator's
B</usr/afs/backup/tapeconfig> file, instead of from tape. For the sake of
clarity, the following text refers to tapes only, but the Backup
System handles backup data files in much the same way.)

The most common reason to run this command is to replace a corrupted
or otherwise damaged Backup Database; use the C<backup dbverify> command
to determine the database's status. The command can also be used to
restore records that were removed from the database when the B<-archive>
argument was included on a previous C<backup savedb> command.

The command completely overwrites the existing Backup Database records
for volume sets, Tape Coordinators, and the dump hierarchy with the
corresponding information from the saved version. It does not
overwrite existing dump records, but instead interleaves the records
from the copy being restored. If both the existing database (on the
Backup Server machine's disk) and the copy being restored include a
record about the same dump, the Backup System retains the one in the
existing database.

The Tape Coordinator's default response to this command is to access
the first tape it needs by invoking the B<MOUNT> instruction in the local
B</usr/afs/backup/CFG_>I<device_name> file, or by prompting the backup
operator to insert the tape if there is no B<MOUNT> instruction. However,
if the B<AUTOQUERY NO> instruction appears in the B<CFG_>I<device_name> file,
or if the issuer of the B<butc> command included the B<-noautoquery> flag,
the Tape Coordinator instead expects the tape to be in the device
already. If it is not, or is the wrong tape, the Tape Coordinator
invokes the B<MOUNT> instruction or prompts the operator. It also invokes
the B<MOUNT> instruction or prompts for any additional tapes needed to
complete the restore operation; the backup operator must arrange to
provide them.

=head1 OPTIONS

=over 4

=item B<-portoffset> I<TC port offset>

Specifies the port offset number of the Tape Coordinator
handling the tapes for this operation.

=item B<-localauth>

Constructs a server ticket using a key from the local
B</usr/afs/etc/KeyFile> file. The C<backup> command interpreter
presents it to the Backup Server, Volume Server and VL Server
during mutual authentication. Do not combine this flag with the
B<-cell> argument. For more details, see the introductory L<backup(1)>
reference page.

=item B<-cell> I<cell name>

Names the cell in which to run the command. Do not combine this
argument with the B<-localauth> flag. For more details, see the
introductory L<backup(1)> reference page.

=item B<-help>

Prints the online help for this command. All other valid
options are ignored.

=back

=head1 EXAMPLES

The following example shows the Backup Database being restored from
the Tape Coordinator with port offset 0:

    backup restoredb

=head1 PRIVILEGE REQUIRED

The issuer must be listed in the B</usr/afs/etc/UserList> file on every
machine where the Backup Server is running, or must be logged onto a
server machine as the local superuser B<root> if the B<-localauth> flag is
included.

=head1 CAVEATS

If the database is corrupted, do not attempt to restore a saved
database on top of it. Instead, use the instructions for repairing a
corrupted database in the IBM AFS Administration Guide chapter about
performing backup operations.

=head1 COPYRIGHT

IBM Corporation 2000. <http://www.ibm.com/> All Rights Reserved.

Converted from html to pod by Alf Wachsmann <alfw@slac.stanford.edu>, 2003,
and Elizabeth Cassell <e_a_c@mailsnare.net>, 2004,
Stanford Linear Accelerator Center, a department of Stanford University.

=head1 SEE ALSO

L<backup(1)>,
L<backup_dbverify(1)>,
L<backup_savedb(1)>,
L<butc(1)>,
I<IBM AFS Administration Guide>

=cut
