HP 3000 Manuals HP 3000 Manuals
Backup and Recovery of Shared Disc Files Files that are saved on shared discs are protected by the regular backups done on the HP 3000. In addition, you can use the Backup funtion of the Resource Manager Utility (RESMGR) to back up just the shared disc files. RESMGR also allows you to recover shared disc files. RESMGR's Recover function works for shared disc files backed up either through regular system backup or through the RESMGR Backup function. Using MPE System Backup MPE files that can be seen with the MPE LISTF command are automatically stored on tape every time the HP 3000 is backed up. This also backs up all files on the shared disc. Shared disc files on an MPE backup tape cannot be selectively restored using the VDTnnnnn filenames because there is no way for the user to link a VDT filename to its corresponding DOS directory filename. Instead, if a file must be retrieved from an HP 3000 backup tape set, use the Recover function of the Resource Manager Utility (RESMGR). RESMGR can recover shared disc files on either a tape created using the Backup function of RESMGR or an MPE backup tape.
CAUTION It is important that there are no active connections to a share disc when attempting to back up shared discs. LAN Manager Clients will retry connections, even if you abort all PDServer sessions. To be sure there are no active connections, do the following: * Stop the network * Abort the common session or * Stop just the Resource Sharing server. * Abort the common session To stop the Resource Sharing server, enter the following command: NSCONTROL STOP=PDS,PDSS When the backup is completed, start the Resource Sharing server by entering the following command: NSCONTROL START=PDS,PDSS
Using Resource Manager to Back Up and Recover Files The Resource Manager Utility (RESMGR) contains functions for backing up and recovering shared disc files to an HP 3000 using the DOS file names. The Backup and Recover procedures are outlined in Chapter 9, "Managing Shared Discs." You can back up to a variety of tape media, such as reel-to-reel, cartridge or digital data storage cassette (DDS). Once backed up, the files can be retrieved with the same flexibility; for example, one single file using its DOS name, groups of files using wildcard characters or all files from a shared disc. If a particular set of shared discs are backed up or recovered on a regular basis, or if a complicated set of file definitions using wildcard characters are backed up or recovered, put this information into an MPE file using any standard HP 3000 editor application. This helps guarantee accuracy. Use the MPE file name with a wildcard prefix ^ as the file set to be backed up. The contents of the file will be the actual filesets to be backed up or recovered. For example, you create a file called MYBACKUP containing these commands: \*.BAT \GALLERY\*.* When you backup or recover the file ^MYBACKUP, RESMGR performs the operation on the two specified filesets--all files in the root directory with the .BAT extension, and all files in the GALLERY subdirectory. Backup and Recovery Constraints The Backup and Recover functions of RESMGR use the same format as the MPE STORE function. Recover reloads files from a standard HP 3000 Store format tape. The tape could have been produced from the standard system backup or could have been created with the RESMGR BACKUP command. You can restore shared discs from the MPE backup tapes with the MPE RESTORE command, provided you have backed up the entire shared disc, storing all of the files in the group, account, or system. However, there is a potential problem when you restore the files of a group. There is only one VDROOT file for each group of shared files. If you restore a group from a previously created backup tape, the old VDROOT file will overwrite the current VDROOT file. Then you will not be able to access files created after the backup tape was made because information needed to access them will be lost. Also, the DOS DIR command may list files that no longer exist.