Lesson 2 Storing and Restoring Files from Tape

Introduction

Lesson 2 presents the STORE/RESTORE utility:

Figure 5-2 STORE/RESTORE Utility Subsystem

	NOTE: The user procedures established by system management for storing and restoring files to and from tape may vary from facility to facility. The user procedures described in this lesson assume that system operators load and unload tapes from the tape drives, and that users are responsible for entering the equation to define the device and the command to store or restore the file(s). Prior to using the STORE/RESTORE subsystem utility, check with your system management for specific procedures for your facility.

Consider the following situations:

Sooner or later you will encounter similar situations where you will need to store files on tape for immediate or future use. The most efficient way to store files for possible future use or to transport files between accounts is by using the STORE/RESTORE utility.

Store utility

The STORE utility is used to copy files from disk to magnetic tape. The primary purpose is to back up files in the event of a system failure or to transfer files to other locations.

	NOTE: Although there are other methods to copy disk files to tape, you should always use the STORE command for backup and transfer between locations.

The STORE command does the following:

Using STORE

After you have logged on to your account, you can enter the commands to store files to tape from your terminal.

	NOTE: Call system operations prior to completing the exercises in this lesson to get their cooperation in loading tapes for you. Otherwise, complete the exercises with pencil and paper.

Consider how this works for scenario 1. You want to move all the files from the PUB group to another account on the same system. Your system operator has mounted a tape for you, and you enter the following in order to initiate the STORE process:

   FILE T;DEV=TAPE

   STORE @.PUB.ACCTx;*T

If the STORE is completed successfully, here's what you should see on your display:

   >> TURBO-STORE/RESTORE  VERSION  A.21.01  HP30319A <<

    (C) 1986 HEWLETT-PACKARD CO.

   (TODAY'S DATE, TIME)



   FILES STORED :                               19

Transporting files to a new system

Sometimes it is necessary to use STORE in order to transport files to another HP 3000 system.

Check with that system operations personnel for the following information:

Now consider scenario 2 — transferring files from an MPE/iX system to an MPE V system. You find that the tape drives for the new system require a 1600 bpi tape format. Therefore, your file equation should look like this:

   FILE T;DEV=TAPE;DEN=1600

The new system is an MPE V which means you need to add the TRANSPORT parameter to your STORE command to ensure a readable tape format:

   STORE @.@.ACCTx;*T;TRANSPORT

	NOTE: It is a good practice to note on the tape label any special options used when creating the tape using STORE. This may save you time when you restore the files. If you used a special density in the file equation or the TRANSPORT option, write these on the tape label.

STORE parameters

Besides the TRANSPORT parameter, the STORE command has a number of other parameters, which allow you to copy different sets of files as well as monitor the progress of the STORE process.

Go into the Help Facility now and list the STORE parameters to your screen. Your awareness of the additional capabilities of this command is important for future use.

Hint

HELP STORE PARMS

Several of the parameters are discussed below. For others see the Help Facility or the MPE/iX Commands Reference Manual Volumes 1 and 2 (32650-90003 and 32650-90364).

Be Careful

Use caution with the PURGE option. If the tape is defective the data is lost.

Using RESTORE

The RESTORE process essentially reverses the STORE process. Consider scenario 3—reloading files from a STORE tape onto your system.

To restore files from a tape to your account, you would give the tape to your system operator to be mounted, and enter the following at your terminal: