HP 3000 Manuals HP 3000 Manuals
Data Recovery
Data can be recovered from disks by using DISCUTIL in conjunction with
the RECOVER command of VOLUTIL. This section describes two data recovery
tasks:
* Saving files to tape using DISCUTIL.
* Recovering files to disk using VOLUTIL.
Saving Files to Tape
Saving files to tape allows you to save data that you cannot access
because the disk has failed, the system has failed, or a directory has
become corrupted. The DISCUTIL SAVE command is used to save files.
Example: Saving Files to Tape.
This example shows how to save disk files to tape using DISCUTIL.
1. Enter the SAVE command at the discutil prompt.
2. Enter the file set you want saved at the prompt.
______________________________________________________
| |
| |
| discutil>SAVE |
| |
| ENTER FILE SET TO BE SAVED: MYFILE.JOHN.SMITH |
| |
______________________________________________________
Use the filename.groupname.acctname syntax where:
filename is the file designator.
The file(s) must reside on a disk defined
during startup of DISCUTIL or with the
DISCUTIL CONFIGURE command. Refer to
chapter 5 for more information on this
command.
groupname is an optional group designator.
acctname is an optional account designator.
If you press RETURN without entering a file set, DISCUTIL ends the
SAVE command.
The parameters filename, groupname, and acctname may be replaced
by @ to signify "all members of the set". For example, @.@.MPEXL,
@.UTIL.MPEXL, or @.@.@. @.@.@, @.@, and @ are equivalent.
The prompt is repeated after the file set is saved. To terminate
SAVE, press RETURN.
3. Enter RETURN at the prompt below to indicate that "no"
hierarchical directories are saved.
__________________________________________________
| |
| |
| TRAVERSE DIRECTORIES UNDER FILESET (Y/N)? |
| |
__________________________________________________
4. Enter the LDEV at the prompt.
_______________________________________
| |
| |
| ENTER THE LDEV: 17 |
| |
_______________________________________
To save files from a particular logical device (disk), enter the
LDEV now. SAVE searches only the specified disk for the file(s)
you want to save. You may also press RETURN at this prompt to
indicate you want SAVE to search each LDEV for file(s). The LDEV
entered must be one that is known to DISCUTIL. Use the PDEV
command to determine if an LDEV is valid. Refer to chapter 5 for
more information on this command.
5. The SAVE command prompts you for a volume set name if you did not
specify an LDEV number.
The volume set's name is the name of the volume set you want to
save. If a volume set name is not given, DISCUTIL saves the file
sets from all disks. If you enter an LDEV, DISCUTIL will not
prompt for a volume set.
____________________________________________
| |
| |
| ENTER THE VOLUME SET NAME: PROD_SET |
| |
____________________________________________
Enter the volume set's name if you want SAVE to search for
file(s). The volume set's name must be known to DISCUTIL. Use the
PDEV command to determine valid volume set names. You may also
press RETURN to indicate you want SAVE to search all disks for the
file(s).
6. Enter the modification date at the prompt.
_____________________________________________________________
| |
| |
| ENTER THE MODIFICATION DATE (MM/DD/YYYY): 04/01/1989 |
| |
_____________________________________________________________
Only files modified since this date are saved to tape. DD is a
two-digit number for the day of the month, MM is a two-digit
number for the month, and YYYY is a four-digit number for the
year. Omit the date specification and press RETURN at the prompt
to save all files requested.
_____________________________________________________________
| |
| |
| discutil> SAVE |
| |
| WARNING BLOCK |
| |
| ENTER FILE SET TO BE SAVED: MYFILE.JOHN.SMITH |
| |
| TRAVERSE DIRECTORIES UNDER FILESET (Y/N)? |
| |
| ENTER THE LDEV: 17 |
| |
| ENTER THE MODIFICATION DATE (MM/DD/YYYY): 04/01/1989 |
| |
| ENTER THE TAPE LDEV 7 |
| |
| MYFILE.JOHN.SMITH - LDEV 17 - ADDR $0002CA0 - FOUND |
| MYFILE.JOHN.SMITH - LDEV 17 - ADDR $0002CA0 - SAVED |
| |
| WARNING BLOCK |
| |
| ENTER FILE SET TO BE SAVED: |
| |
_____________________________________________________________
Modified Files Saved
DISCUTIL now searches each LDEV specified for the designated
file(s). Each time a file is found a message is printed. When
the file is successfully written to tape another message is
printed. Errors are also reported. If the end of a tape is
reached, DISCUTIL prompts to mount a new tape. Once a tape is
mounted, the save continues until all specified files are written.
7. Enter the TAPE LDEV: ldev
8. After all specified files are saved, the ENTER FILE SET TO BE
SAVED: prompt is displayed and you may specify additional files.
To Make Multiple Tapesets.
To make multiple tapesets, the current SAVE command must finish with the
current tapeset. To do this, type RETURN at the ENTER FILE SET TO BE
SAVED: prompt. This returns you to the DISCUTIL> prompt, and the
following message displays.
___________________________________________________________________________________
| |
| |
| MANUALLY REWINDING THE TAPE DRIVE AND STARTING A NEW TAPESET |
| BEFORE THE CURRENT SAVE COMMAND IS COMPLETE WILL CAUSE FILES TO BE LOST!!! |
| |
___________________________________________________________________________________
Example: Making Multiple Filesets.
This example shows how to make multiple filesets.
1. Invoke SAVE.
2. The system displays the following:
___________________________________________________________________________________
| |
| |
| WARNING!!! |
| MANUALLY REWINDING THE TAPE DRIVE AND STARTING A NEW TAPESET |
| BEFORE THE CURRENT SAVE COMMAND IS COMPLETE WILL CAUSE FILES TO BE LOST!!! |
| |
| PRESS RETURN AT "ENTER FILE SET TO BE SAVED:" TO COMPLETE THE SAVE |
| PROPERLY. SEE HELP ON SAVE. |
| |
| ENTER FILE SET TO BE SAVED: @.@.@ |
| |
| TRAVERSE DIRECTORIES UNDER FILE SET (Y/N)? RETURN |
| |
| ENTER THE LDEV: RETURN |
| |
| ENTER C RETURN TO CONTINUE |
| |
| ENTER THE VOLUME SET NAME: RETURN |
| |
| ENTER THE MODIFICATION DATE: RETURN |
| |
| ENTER THE TAPE LDEV: 7 |
| |
| ENTER FILE SET TO BE SAVED: RETURN |
| : |
| |
___________________________________________________________________________________
Tape Errors During a DISCUTIL SAVE.
If a tape ends in the middle of a file, the rest of the file will be
saved on the next tape. If a tape write error occurs, DISCUTIL resaves
all files on the bad tape to a new tape. If part of a file is on the
previous tape, then the entire file is resaved on the new tape. DISCUTIL
marks a tape anytime it cannot save an entire file. The VOLUTIL RECOVER
command aborts the recovery of that file when it reads the mark on a
file. It then continues with the next file.
Exiting DISCUTIL.
DISCUTIL is terminated by using the EXIT command. Control then returns
to the system and the system prompt is displayed.
Recovering Files to Disk
VOLUTIL's RECOVER command recreates files from the output tape produced
by DISCUTIL. You will need SM, system manager, capability to use the
VOLUTIL RECOVER command.
Example: Recovering Files to Disk.
This example shows how to recover disk files from tape after the
operating system has been successfully restarted.
1. Load the tape that contains the files you want to recover.
2. Invoke VOLUTIL.
3. Use the RECOVER command with the NOKEEP option to start the copy.
The NOKEEP option replaces files on the disk with files of the
same name on the tape. As each file is copied to the disk,
messages are displayed.
4. The system will prompt you to mount the next tape if the files
continue onto additional tapes.
_____________________________________________________
| |
| |
| volutil: RECOVER;NOKEEP |
| |
| (fname) (group) (acct) IS RESTORED |
| TEXT .PROD .MANUF IS RESTORED |
| INTRO .PROD .MANUF IS RESTORED |
| VOLM2 .PROD .MANUF IS RESTORED |
| |
| END OF VOLUME, RECOVER DONE |
| |
_____________________________________________________