=head1 NAME backup_volrestore - Restores one or more volumes =head1 SYNOPSIS =for html
B S<<< B<-server> > >>> S<<< B<-partition> > >>> S<<< B<-volume> >+ >>> S<<< [B<-extension> >] >>> S<<< [B<-date> >+] >>> S<<< [B<-portoffset> >+] >>> [B<-dryrun> | B<-n>] S<<< [B<-usedump> >] >>> [B<-localauth>] S<<< [B<-cell> >] >>> [B<-help>] B S<<< B<-s> > >>> S<<< B<-pa> > >>> S<<< B<-v> >+ >>> S<<< [B<-e> >] >>> S<<< [B<-d> >+] >>> S<<< [B<-po> >+] >>> S<<< [B<-u> >] >>> [B<-dryrun> | B<-n>] [B<-l>] S<<< [B<-c> >] >>> [B<-h>] =for html
=head1 DESCRIPTION The B command restores the contents of one or more volumes to the site indicated by the B<-server> and B<-partition> arguments. Use the command either to overwrite the contents of existing volumes with the restored data or to create new volumes while retaining the existing ones. The specified site does not have to be the current site for the volumes. (If the C instruction appears in the F> file associated with the specified port offset, then the B command restores data from the backup data file listed for that port offset in the Tape Coordinator's F file, rather than 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 command's arguments can be combined as indicated: =over 4 =item * To preserve a volume's current contents and also create a new volume to house the restored version, use the B<-extension> argument. The Backup System creates the new volume on the server and partition named by the B<-server> and B<-partition> arguments, assigns it the same name as the current volume with the addition of the specified extension, and creates a new Volume Location Database (VLDB) entry for it. Creating a new volume enables the administrator to compare the two versions. =item * To overwrite a volume's existing contents with the restored version, omit the B<-extension> argument, and specify the site as indicated: =over 4 =item * To retain the current site, specify it with the B<-server> and B<-partition> arguments. =item * To move the volume to a different site while overwriting it, specify the new site with the B<-server> argument, B<-partition> argument, or both. The Backup System creates a new volume at that site, removes the existing volume, and updates the site information in the volume's VLDB entry. The backup version of the volume is not removed automatically from the original site, if it exists. Use the B command to remove it and the B command to create a backup version at the new site. =back =item * To restore a volume that no longer exists in the file system, specify its name with the B<-volume> argument and use the B<-server> and B<-partition> arguments to place it at the desired site. The Backup System creates a new volume and new VLDB entry. =back In each case, the command sets each volume's creation date to the date and time at which it restores it. The creation date appears in the C field in the output from the B and B commands. If restoring all of the volumes that resided on a single partition, it is usually more efficient to use the B command. If restoring multiple volumes to many different sites, it can be more efficient to use the B command. By default, the backup volrestore command restores the most recent full dump and all subsequent incremental dumps for each volume, bringing the restored volumes to the most current possible state. To restore the volumes to their state at some time in the past, use the B<-date> argument. The Backup System restores the most recent full dump and each subsequent incremental dump for which the I of the volume included in the dump is before the indicated date and time (the clone date timestamp appears in the C field of the output from the B command). For backup and read-only volumes, the clone date represents the time at which the volume was copied from its read/write source; for read/write volumes, it represents the time at which the volume was locked for inclusion in the dump. The resemblance of a restored volume to its actual state at the indicated time depends on the amount of time that elapsed between the volume's clone date in the last eligible dump and the specified time. If the B<-volume> argument specifies the base (read/write) form of the volume name, the Backup System searches the Backup Database for the newest dump set that includes a dump of either the read/write or the backup version of the volume. It restores the dumps of that version of the volume, starting with the most recent full dump. If, in contrast, the volume name explicitly includes the C<.backup> or C<.readonly> extension, the Backup System restores dumps of the corresponding volume version only. To generate a list of the tapes the Backup System needs to perform the restore operation, without actually performing it, combine the B<-dryrun> flag with the options to be used on the actual command. If all of the full and incremental dumps of all relevant volumes were not written to a type of tape that a single Tape Coordinator can read, use the B<-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). If restoring multiple volumes, the same ordered list of port offsets must apply to all of them. If not, either issue this command separately for each volume, or use the B command after defining groups of volumes that were dumped to compatible tape types. For further discussion, see the I. The Tape Coordinator's default response to this command is to access the first tape it needs by invoking the B instruction in the local F> file, or by prompting the backup operator to insert the tape if there is no C instruction. However, if the C instruction appears in the F> file, or if the issuer of the B 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 C instruction or prompts the operator. It also invokes the C 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<-server> > Names the file server machine on which to restore each volume. If this argument and the B<-partition> argument indicate a site other than the current site for each volume, and the B<-extension> argument is not also provided, the Backup System removes the existing volumes from their current sites, places the restored contents at the specified site, and changes the site information in the volume's VLDB entry. =item B<-partition> > Names the partition to which to restore each volume. If this argument and the B<-server> argument indicate a site other than the current site for each volume, and the B<-extension> argument is not also provided, the Backup System removes the existing volumes from their current sites, places the restored contents at the specified site, and changes the site information in the volume's VLDB entry. =item B<-volume> >+ Names one or more volumes to restore, using the volume name as listed in the Backup Database. Provide the base (read/write) name of each volume to have the Backup System search the Backup Database for the newest dump set that includes a dump of either the read/write or the backup version of the volume; it restores the dumps of that version of the volume, starting with the most recent full dump. If, in contrast, a volume name explicitly includes the C<.backup> or C<.readonly> extension, the Backup System restores dumps of the corresponding volume version only. =item B<-extension> > Creates a new volume to house the restored data, with a name derived by appending the specified string to each volume named by the B<-volume> argument. The Backup System creates a new VLDB entry for the volume. Any string other than C<.readonly> or C<.backup> is acceptable, but the combination of the existing volume 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 C<.rst>, for example). =item B<-date> >+ Specifies a date and optionally time; the restored volume includes data from dumps performed before the date only. Provide a value in the format I [I:I], where the required I portion indicates the month (I), day (I
), and year (I), and the optional I portion indicates the hour and minutes in 24-hour format (for example, the value C<14:36> represents 2:36 p.m.). If omitted, the time defaults to 59 seconds after midnight (00:00:59 hours). Valid values for the year range from C<1970> to C<2037>; higher values are not valid because the latest possible date in the standard UNIX representation is in February 2038. The command interpreter automatically reduces any later date to the maximum value. If this argument is omitted, the Backup System restores all possible dumps including the most recently created. =item B<-usedump> > Specifies the dumpID of the specific dump to use to restore the volume. If this option is not specified, we will find the appropriate dump to restore, according to the logic in the B<-date> option. =item B<-portoffset> >+ 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 all dumps at lower levels. Provide this argument unless the default value of 0 (zero) is appropriate for all dumps. If C<0> is just one of the values in the list, provide it explicitly in the appropriate order. =item B<-dryrun> | B<-n> Displays the list of tapes that contain the dumps required by the restore operation, without actually performing the operation. =item B<-localauth> Constructs a server ticket using a key from the local F file. The B 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 L. =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<-help> Prints the online help for this command. All other valid options are ignored. =back =head1 OUTPUT If the issuer includes the B<-dryrun> flag with the command, the following string appears at the head of the list of the tapes necessary to complete the restore operation. Tapes needed: =head1 EXAMPLES The following command restores the volume user.pat to partition F on machine C: % backup volrestore -server fs5.example.com -partition a -volume user.pat The following command restores the volumes C and C to partition F on machine C, adding a C<.rst> extension to each volume name and preserving the existing C and C volumes. Only dumps created before 5:00 p.m. on 31 January 1998 are restored. (The command is shown here on multiple lines only for legibility reasons.) % backup volrestore -server fs4.example.com -partition b \ -volume user.smith user.terry \ -extension .rst -date 1/31/1998 17:00 The following command restores the volume user.pat to partition F on machine C. The Tape Coordinator with port offset 1 handles the tape containing the full dump; the Tape Coordinator with port offset 0 handles all tapes containing incremental dumps. (The command is shown here on two lines only for legibility reasons.) % backup volrestore -server fs5.example.com -partition a \ -volume user.pat -portoffset 1 0 =head1 PRIVILEGE REQUIRED The issuer must be listed in the F 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 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, L, L, L =head1 COPYRIGHT IBM Corporation 2000. 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.