backup_diskrestore - Restores the entire contents of a partition
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>] [-dryrun | -n] [-localauth] [-cell <cell name>] [-config <configuration file>] [-help]
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.
FILE YES instruction appears in the /var/yfs/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/yfs/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 -dryrun 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
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.
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.
Names the file server machine that the VLDB lists as the site of the volumes that need to be restored.
Names the partition that the VLDB lists as the site of the volumes that need to be restored.
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.
0 is just one of the values in the list,
provide it explicitly in the appropriate order.
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.
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.
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
.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
Displays a list of the tapes necessary to perform the requested restore, without actually performing the operation.
Constructs a server ticket using a key from the local /etc/yfs/server/KeyFileExt 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).
Names the cell in which to run the command. Do not combine this argument with the -localauth flag. For more details, see backup(8).
Sets the location of the configuration file to be used. The default file is /etc/yfs/yfs-client.conf.
Prints the online help for this command. All other valid options are ignored.
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 -dryrun flag with the command, the following string appears at the head of the list of the tapes necessary to perform the restore operation:
The following command restores the volumes for which the VLDB lists a read/write site on the /vicepd partition of the machine
fs5.example.com. The Tape Coordinator associated with port offset 3 performs the operation.
% backup diskrestore -server fs5.example.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.example.com to a new site: the /vicepa partition on the machine
fs3.example.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.example.com -partition /vicepb \ -newserver fs3.example.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
% backup diskrestore -server fs4.example.com -partition /vicepm -dryrun Tapes needed: user.sunday1.1 user.sunday1.2 user.monday1.1 user.tuesday1.1 user.wednesday1.1
The issuer must be listed in the /etc/yfs/server/UserListExt file on every machine where the Backup Service or Location Service 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 with an account capable of reading the /etc/yfs/server/KeyFileExt file. =head1 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)
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