How do we restore from Tape on DEC 4.0

[rmueller58]

We had a drive failure.. Need step by step on how to restore from "Dump" tape on DEC Any help appreciated.

[Ivan Ferreira · Accepted solution]

You should use a command like this:

First, list the tape contents:

restore -tf /dev/rmtXh

Second, restore the files:

cd /
restore -xf /dev/rmtXh

[rmueller58]

Thanks Ivan! the H in the device file is what was throwing us off.

Will keep thread open till we get system back up.
Thanx!!

[rmueller58]

We loaded the OS from Scratch.

We have to restore from backup, is it best to go to init 1?

We tried to restore and it restores over the operating system and crashed the kernel..

[Vladimir Fabecic]

Not sure if I understood well.
If kernel is the problem, do the following:
>>> boot -file genvmunix
After OS boots do:
# doconfig (without arguments)
After that copy new kernel as /vmunix
# cp /vmunix
Reboot and it should work OK.

[rmueller58]

Vlad,
The OS he loaded from CD is pre-Y2k.

Not sure my guess is that is is the vmunix as well. My boss is attempting to do a full system restore (non-bootable) from a tape that contains the Y2k compliance stuff.
The Tape contains the most recent full backup.

When it reachs a certain point in the restore it crashes the system. Any ideas from or for this?

[Vladimir Fabecic]

Lets see...
OS version 4.0D and above did not have y2k problem. I did the full system restore once using 4.0D boot CD and everything was OK.
So, what is your OS version?
What file system is used, UFS or advfs?
In what point in the restore it crashes the system?
By the way, in old DEC unix, non-rewind tape device should be /dev/nrmtXh, and rewindable tape is /dev/rmtXh.
Can you describe your restore procedure with more details?

[rmueller58]

We have 4.0D we are reinstalling.. More details will follow..

[Michael Schulte zur Sur]

Hi Rex,

use -v and make sure that you are at the right spot when restoring. When restoring /usr you will have to use cd /usr. Also do not use restore on an ADVFS volume.

greetings,

Michael

[rmueller58]

We gotten this server restored and running. Thanks Vlad and all.

UFS file system.