HP 3000 Manuals

Lesson 2 Storing and Restoring Files from Tape [ Using the 900 Series HP 3000: Advanced Skills Module 4: File Transfer and Storag ] MPE/iX 5.0 Documentation

Using the 900 Series HP 3000: Advanced Skills Module 4: File Transfer and Storag

Lesson 2 Storing and Restoring Files from Tape

Introduction

Lesson 2 presents the STORE/RESTORE utility:

* using STORE to copy files to tape

* using RESTORE to copy files from tape to a system

Figure 4-2. 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:

* Scenario 1: You are moving to a new account on your system and
want to take all of your files from the PUB group to the new
account. How can you transfer these files with a minimum of
effort?

* Scenario 2: Your department is going to be on an HP 3000 MPE V
system not connected to your present system. How can you move
files in your account safely and efficiently to this new system?

* Scenario 3: Now that the MIDAS project is complete, system
operations would like you to remove the MIDAS files from your
system in order to conserve disk space. You know that the MIDAS
project will be resumed in one year. How can you store the files
on tape now, and then reload them on disk when the project
resumes?

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:

* copies files in a format that is optimal for backup and transport

* creates a directory of files on the tape

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.

Step 1 Send a message to your system operator asking that a blank tape
be mounted.

TELLOP PLS MOUNT TAPE. REPLY WHEN MOUNTED.

Step 2 When the tape has been mounted, enter the following file
equation: (Use "T" as the file designator
for the tape or create your own tapename.)

FILE T;DEV=TAPE

Step 3 Enter the STORE command followed by the name of the file(s) to be
copied to the tape. Backreference (*) the tapename.

STORE filename;*T

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 |
| |
______________________________________________________________

--------------------------------------------------------------------------------------------
| |
| Q4-5 How would you change the preceding STORE command to copy all the files in |
| your account to a tape as in scenario 3? |
| |
| |
--------------------------------------------------------------------------------------------

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:

Tape Drive Any density other than the default (6250) should be
Density specified as:

FILE T;DEV=TAPE;DEN=density value

System Type If the destination system is not an MPE/iX system, the
TRANSPORT parameter should be added to the STORE command.

STORE @.@.ACCTx;*T;TRANSPORT

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

--------------------------------------------------------------------------------------------
| |
| Q4-6 Suppose you only need to store those files beginning with the letter M for |
| transfer to an MPE V system. How would you write the STORE command to do |
| this? |
| |
| |
--------------------------------------------------------------------------------------------

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) .

PROGRESS STORE @.@.ACCTx;*T;PROGRESS=5

When storing a large number of files to a tape,
use the PROGRESS parameter to monitor the process. The
STORE command above will display a progress message every
five minutes.

SHOW STORE @.@.ACCTx;*T;SHOW

The SHOW parameter prints a message on your terminal screen
every time a file is stored. In the event of problems, the
SHOW parameter displays an error message. You can direct
the SHOW listing to another device if you choose. For
example, to include a printout of file names with the tape,
use:

STORE @.@.ACCTx;*T;SHOW=OFFLINE

PURGE STORE @.@.ACCTx;*T;PURGE

The PURGE parameter erases the original file from the
disk as soon as it is copied onto tape.

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:

Step 1 Enter the same file equation entered for the STORE process.

FILE T;DEV=TAPE

Step 2 Enter RESTORE followed by a backreference to the tape name
you just defined, followed by the file name(s) to be
restored.

RESTORE *T;@.@.ACCTx

--------------------------------------------------------------------------------------------
| |
| Q4-7 What RESTORE command would restore only the files from the PROJECT group of |
| your account? |
| |
| |
--------------------------------------------------------------------------------------------

Lesson summary

1. To store files on tape, use a file equation to define the
destination device. Use a STORE command so that the name(s) of
the file(s) to be stored is backreferenced to the tape:

FILE T;DEV=TAPE
STORE filename;*T

2. Add the TRANSPORT parameter to your STORE command if the STORE
tape will be reloaded on a system other than MPE/iX:

STORE @.ACCTx;*T;TRANSPORT

3. Add the DENSITY parameter to the tape file equation when storing
files that will be restored on a tape drive with a different
density.

FILE T;DEV=TAPE;DEN=1600

4. Add the SHOW or PROGRESS parameter to your STORE command to
monitor the STORE process; add the PURGE parameter to delete files
after they are stored only if they need to be purged.

STORE @.@.ACCTx;*T;SHOW
STORE @.@.ACCTx;*T;PROGRESS=3
STORE @.@.ACCTx;*T;PURGE

5. To restore files from tape, enter the file equation used for the
STORE procedure followed by the RESTORE command.

FILE T;DEV=TAPE
RESTORE *T;@.@.ACCTx

Exercise 4-4:lesson 2 review.

Now that you have taken the Advanced Skills Course, your manager has
asked you to assist other members of the department to store files on
tape. By Monday afternoon, a number of problems have come up. How many
can you solve? (Assume that all the other members are working in the PUB
group of the ADVUSER account.)

1. The use of the following equation and the STORE command gives the
user an error message on the terminal screen. What's wrong?

FILE T;DEV=TAPE
STORE @.@.ADVUSER;T

2. Someone else has a problem trying to restore a tape made earlier
today to another system where the user has an account. The
destination system is unable to "read" the tape. What might be
the problem?

3. A friend has asked you to help store and then restore some files
from the PUB group of an ADVUSER account on an MPE/iX system to an
ADVUSER account on an MPE V system.

The tape density of the current system is 6250 bpi; however, the
tape drives for the new system will accommodate only 1600 bpi
tape.

How would you write the file equations and the STORE and RESTORE
commands to complete the process?

4. Another member of the department used the PURGE parameter when
storing files on tape. Unfortunately, the tape has proven to be
defective. Is there any way to recover the files?

********** End of Exercise 4-4 **********

MPE/iX 5.0 Documentation