# Administration Reference

## backup restoredb

Purpose

Restores a saved copy of the Backup Database

Synopsis

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

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

Description

The 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 backup savedb command.

(If the FILE YES instruction appears in the /usr/afs/backup/CFG_device_name file associated with the specified port offset, then the backup restoredb command restores data from the backup data file listed for that port offset in the Tape Coordinator's /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 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 -archive argument was included on a previous 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 MOUNT instruction in the local /usr/afs/backup/CFG_device_name file, or by prompting the backup operator to insert the tape if there is no MOUNT instruction. However, if the AUTOQUERY NO instruction appears in the CFG_device_name file, or if the issuer of the butc command included the -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 MOUNT instruction or prompts the operator. It also invokes the MOUNT instruction or prompts for any additional tapes needed to complete the restore operation; the backup operator must arrange to provide them.

Cautions

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 AFS Administration Guide chapter about performing backup operations.

Options

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

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

-cell
  Names the cell in which to run the command. Do not combine this argument with the -localauth flag. For more details, see the introductory backup reference page.

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

Examples

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

       % backup restoredb

Privilege Required

The issuer must be listed in the /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 root if the -localauth flag is included.

Related Information

backup

backup dbverify

backup savedb

butc

AFS Administration Guide

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