Provided by: openafs-client_1.6.7-1ubuntu1.1_amd64 
NAME
backup_diskrestore - Restores the entire contents of a partition
SYNOPSIS
backup diskrestore -server <machine to restore>
-partition <partition to restore>
[-portoffset <TC port offset>+]
[-newserver <destination machine>]
[-newpartition <destination partition>]
[-extension <new volume name extension>]
[-n] [-localauth] [-cell <cell name>] [-help]
backup di -s <machine to restore>
-pa <partition to restore>
[-po <TC port offset>+]
[-news <destination machine>]
[-newp <destination partition>]
[-e <new volume name extension>] [-n] [-l]
[-c <cell name>] [-h]
DESCRIPTION
The backup diskrestore command restores all of the volumes for which the Volume Location
Database (VLDB) lists a read/write site on the partition specified with the -server and
-partition arguments. It is useful if a disk or machine failure corrupts or destroys the
data on an entire partition. (To restore any read-only or backup volumes that resided on
the partition, use the vos release and vos backup commands, respectively, after restoring
the read/write version.)
If restoring only selected volumes to a single site, it is usually more efficient to use
the backup volrestore command. To restore multiple volumes to many different sites, use
the backup volsetrestore command.
(If the "FILE YES" instruction appears in the /var/lib/openafs/backup/CFG_device_name file
on the Tape Coordinator machine associated with the specified port offset, then the Backup
System restores data from the backup data file listed for that port offset in the Tape
Coordinator's /var/lib/openafs/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 Backup System determines whether the read/write or backup version of each volume was
dumped more recently, and restores the dumps of that version, starting with the most
recent full dump. It resets the creation timestamp of each restored volume to the date and
time at which it begins restoring the volume (the creation timestamp appears in the
"Creation" field of the output from the vos examine and vos listvol commands).
If all of the full and incremental dumps of all relevant volumes were not written on
compatible tape devices, use the -portoffset argument to list multiple port offset numbers
in the order in which the tapes are needed (first list the port offset for the full dump,
second the port offset for the level 1 incremental dump, and so on). This implies that the
full dumps of all relevant volumes must have been written to a type of tape that the first
Tape Coordinator can read, the level 1 incremental dumps to a type of tape the second Tape
Coordinator can read, and so on. If dumps are on multiple incompatible tape types, use the
backup volrestore command to restore individual volumes, or the backup volsetrestore
command after defining groups of volumes that were dumped to compatible tape types. For
further discussion, see the OpenAFS Administration Guide.
By default, the Backup System restores the contents of the specified partition to that
same partition. To restore the contents to an alternate site, combine the following
options as indicated. The Backup System removes each volume from the original site, if it
still exists, and records the change of site in the VLDB.
• To restore to a different partition on the same file server machine, provide the
-newpartition argument.
• To restore to the partition with the same name on a different file server machine,
provide the -newserver argument.
• To restore to a completely different site, combine the -newserver and -newpartition
arguments.
By default, the Backup System overwrites the contents of existing volumes with the
restored data. To create a new volume to house the restored data instead, use the
-extension argument. The Backup System creates the new volume at the site designated by
the -newserver and -newpartition arguments if they are used or the -server and -partition
arguments otherwise. It derives the volume name by adding the extension to the read/write
base name listed in the VLDB, and creates a new VLDB entry. The command does not affect
the existing volume in any way. However, if a volume with the specified extension also
already exists, the command overwrites it.
To print out a list of the tapes containing the needed dumps, without actually performing
the restore operation, include the -n flag along with the other options to be used on the
actual command.
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 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 issuing this command to recover data after a disk crash or other damage, be sure not to
issue the vos syncserv command first. Doing so destroys the VLDB record of the volumes
that resided on the partition.
OPTIONS
-server <machine to restore>
Names the file server machine that the VLDB lists as the site of the volumes that need
to be restored.
-partition <partition to restore>
Names the partition that the VLDB lists as the site of the volumes that need to be
restored.
-portoffset <TC port offset>+
Specifies one or more port offset numbers (up to a maximum of 128), each corresponding
to a Tape Coordinator to use in the operation. If there is more than one value, the
Backup System uses the first one when restoring the full dump of each volume, the
second one when restoring the level 1 incremental dump of each volume, and so on. It
uses the final value in the list when restoring dumps at the corresponding depth in
the dump hierarchy and at all lower levels.
Provide this argument unless the default value of 0 (zero) is appropriate for all
dumps. If 0 is just one of the values in the list, provide it explicitly in the
appropriate order.
-newserver <destination machine>
Names an alternate file server machine to which to restore the volumes. If this
argument is omitted, the volumes are restored to the file server machine named by the
-server argument.
-newpartition <destination partition>
Names an alternate partition to which to restore the data. If this argument is
omitted, the volumes are restored to the partition named by the -partition argument.
-extension <new volume name extension>
Creates a new volume for each volume being restored, to house the restored data. The
Backup System derives the new volume's name by appending the specified string to the
read/write base name listed in the VLDB, and creates a new VLDB volume entry. The
Backup System preserves the contents of the volumes on the partition, if any still
exist. Any string other than ".readonly" or ".backup" is acceptable, but the
combination of the base name and extension cannot exceed 22 characters in length. To
use a period to separate the extension from the name, specify it as the first
character of the string (as in ".rst", for example).
-n Displays a list of the tapes necessary to perform the requested restore, without
actually performing the operation.
-localauth
Constructs a server ticket using a key from the local /etc/openafs/server/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 backup(8).
-cell <cell name>
Names the cell in which to run the command. Do not combine this argument with the
-localauth flag. For more details, see backup(8).
-help
Prints the online help for this command. All other valid options are ignored.
OUTPUT
If a tape error occurs during the restore operation, the Tape Coordinator displays the
following messages:
Restore operation on volume I<name> failed due to tape error
Do you want to continue (y/n)?
where name is the name of the volume that was being restored when the tape error occurred.
Enter the value y to continue the operation without restoring the indicated volume or the
value "n" to terminate the operation. In the latter case, the operator can then attempt to
determine the cause of the tape error.
If the issuer includes the -n flag with the command, the following string appears at the
head of the list of the tapes necessary to perform the restore operation:
Tapes needed:
EXAMPLES
The following command restores the volumes for which the VLDB lists a read/write site on
the /vicepd partition of the machine "fs5.abc.com". The Tape Coordinator associated with
port offset 3 performs the operation.
% backup diskrestore -server fs5.abc.com -partition /vicepd -portoffset 3
The following command restores the volumes for which the VLDB lists a read/write site on
the /vicepb partition of the machine "fs1.abc.com" to a new site: the /vicepa partition on
the machine "fs3.abc.com". The Tape Coordinator associated with port offset 0 performs the
operation. (The command appears here on two lines only for legibility.)
% backup diskrestore -server fs1.abc.com -partition /vicepb \
-newserver fs3.abc.com -newpartition /vicepa
The following command lists the tapes required to restore the volumes for which the VLDB
lists a read/write site on the /vicepm partition of the machine "fs4.abc.com":
% backup diskrestore -server fs4.abc.com -partition /vicepm -n
Tapes needed:
user.sunday1.1
user.sunday1.2
user.monday1.1
user.tuesday1.1
user.wednesday1.1
PRIVILEGE REQUIRED
The issuer must be listed in the /etc/openafs/server/UserList file on every machine where
the Backup Server or Volume Location (VL) Server is running, and on every file server
machine that houses an affected volume. If the -localauth flag is included, the issuer
must instead be logged on to a server machine as the local superuser "root".
SEE ALSO
butc(5), backup(8), backup_dump(8), backup_volrestore(8), backup_volsetrestore(8),
butc(8), vos_backup(1), vos_examine(1), vos_listvol(1), vos_release(1)
COPYRIGHT
IBM Corporation 2000. <http://www.ibm.com/> All Rights Reserved.
This documentation is covered by the IBM Public License Version 1.0. It was converted
from HTML to POD by software written by Chas Williams and Russ Allbery, based on work by
Alf Wachsmann and Elizabeth Cassell.