System disk crash

[man_chung818]

Hi all,

I am using Tru64 Unix 4.0g.

The system disk was crashed. Luckly, I did a system backup before using vdump command. Is there anyone know how to restore the system disk from tape in bootloader (e.g. >>> )
Or any other method for recovery?

Thank you!

regards,
Man

[Vladimir Fabecic]

Hello Man
Since it is 4.0, it would be easier.
General procedure:
1. First boot from instalation CD and choose unix shell
>>> boot (boot DKA400)
2. Check if disk and tape devices are presented. If so, label the disk using disklabel. Example:
# disklabel -rw /dev/rrz0c rz28
3. Edit disk partitions using
# disklabel -e /dev/rrz0c
or use graphics utility from instalation CD
4. Create file system (by the way did you have UFS or advfs for root?)
# newfs /dev/rz0a (for UFS)
5. Mount "disk root" somewhere"
# mount /dev/rz0c /mnt
6. Restore data
# cd /mnt
# restore -x -f /dev/nrmt0h

After that you can create and restore other file systems or you can boot in single user mode (>>> boot -flag 0 DKA0), mount root and do the rest.
Please, supply more details if you need additional help.

[AwadheshPandey]

this link will help you to restore ur root disk in digital unix 4.0
http://the-welters.com/professional/dunix-quickref/disk-recovery.html

cheers,

Awadhesh

[Arch_Muthiah]

Man,

This is another way to restore...
1. boot the Operating System CD
2. go to the shell prompt
3. cd /var/dev
3. ./MAKEDEV tzxx (where xx is the tape-drive device number; creates device
special files)
4. ./MAKEDEV rzxx (where xx is the actually system disk where / and /usr are
located)
5. mkfdmn /dev/rzxxa root_domain (recreate advfs root domain)
6. A message appears who ask you if you really want to create the
file-domain. type yes
7. mkfset root_domain root (creates fileset)
8. mount -r root_domain#root /mnt (mounts fileset)
9. cd /mnt
10. vrestore xvf /dev/nrmtxh . (restores the first fileset on tape in /mnt)
11. cd /
12. umount /mnt
13. mkfdmn /dev/rzxxg usr_domain (recreate advfs usr domain)
14. A message appears who ask you if you really want to create the
file-domain. type yes
15. mkfset usr_domain usr (creates usr fileset)
16. mount usr_domain#usr /mnt (mounts fileset)
17. cd /mnt
18. vrestore xvf /dev/nrmtxh . (restores the first fileset on tape in /mnt)
19. mt -f /dev/rmtxh rew (tape rewind)
20. cd /
21. umount /mnt
22. now you have restored / and /usr and you can reboot the alpha
23. when the machine is in multiuser you can restore other files with
networker

Archunan

[man_chung818]

Thanks for all reply. I will try yours suggestion now.

[Shardha]

Dear Man Chung

Another shortcut.

To restore ( / and /usr and /var).

/ file system

- boot from CD cd
-
Provide the installation options, and partition the disk.
Let the installation procedure to create / swap /usr /var file systems.
Press control C when it starts coping subsets

Restore / file system.

- mount root_domain#root /mnt
-/dev/MKDEVICE tzX
# cd /mnt
#vrestore -i
-add /
-verbose
-extract
-umount /mnt

Restore /usr file system
- cd /etc/fdmns
- mkdir usr_domain
- cd usr_domain
- ln -s /dev/re0g
- mount usr_domain#root /mnt
# cd /mnt
# mt fst 1
#vrestore -i
-add /
-verbose
-extract
-umount /mnt


Restore /var file system
- cd /etc/fdmns
- mkdir var_domain
- cd var_domain
- ln -s /dev/re0g
- mount var_domain#root /mnt
# cd /mnt
# mt fst 2
#vrestore -i
-add /
-verbose
-extract
-umount /mnt
Now halt the system and boot normally.

[Shardha]

Dear Man,

i found some mistakes the procedure send, please ignore and use following procedure to restore the system disk. I did it many time and this is the simple and short procedure.

Shardha

To restore (/ and /usr and /var).
/ file system
- boot cd
Provide the installation options, and partition the disk.
Let the installation procedure to create / swap /usr /var file systems.
Press control C when it starts coping subsets
Restore / file system
- cd /etc/fdmns
- mkdir root_domain
- cd root_domain
- ln -s /dev/rz0a
- mount root_domain#root /mnt
-/dev/MKDEVICE tz5x
# cd /mnt
#vrestore -i
-add /
-verbose
-extract
-umount /mnt

Restore /usr file system
- cd /etc/fdmns
- mkdir usr_domain
- cd usr_domain
- ln -s /dev/rz0g
- mount usr_domain#usr /mnt
# cd /mnt
# mt fst 1
#vrestore -i
-add /
-verbose
-extract
-umount /mnt

Restore /var file system
- cd /etc/fdmns
- mkdir var_domain
- cd var_domain
- ln -s /dev/re0h
- mount var_domain#var /mnt
# cd /mnt
# mt fst 2
#vrestore -i
-add /
-verbose
-extract
-umount /mnt
Now halt the system and boot normally.

[Shardha]

Dear Man,

i found some mistakes the procedure send, please ignore and use following procedure to restore the system disk. I did it many time and this is the simple and short procedure.

Shardha

To restore (/ and /usr and /var).
/ file system
- boot cd
Provide the installation options, and partition the disk.
Let the installation procedure to create / swap /usr /var file systems.
Press control C when it starts coping subsets
Restore / file system
- cd /etc/fdmns
- mkdir root_domain
- cd root_domain
- ln -s /dev/rz0a
- mount root_domain#root /mnt
-/dev/MKDEVICE tz5x
# cd /mnt
#vrestore -i
-add /
-verbose
-extract
-umount /mnt

Restore /usr file system
- cd /etc/fdmns
- mkdir usr_domain
- cd usr_domain
- ln -s /dev/rz0g
- mount usr_domain#usr /mnt
# cd /mnt
# mt fst 1
#vrestore -i
-add /
-verbose
-extract
-umount /mnt

Restore /var file system
- cd /etc/fdmns
- mkdir var_domain
- cd var_domain
- ln -s /dev/rz0h
- mount var_domain#var /mnt
# cd /mnt
# mt fst 2
#vrestore -i
-add /
-verbose
-extract
-umount /mnt
Now halt the system and boot normally.

[Matthew Warren]

Going through these procedures, I am getting an error when retoring the /usr usr_domain filesset that /var is full?

How can that be?

I am due to go invetigate the problem. the only thing I can think is,

the system has been used for restore tests before.

the system that is being restored has put new files in /var and removed some others from /var.

the system being restored too has old files in var that are not ebing deleted by the new restore?

..only trouble with this is that a mkfdm is dome for root_domain and usr_domain and existing files deleted as a consequence?


...non-Tru64 chap trying a DR test for True64..

Thanks,

Matt.