Hi,
I got the problem solved - Hexeditor is your friend!
Steps: (Networker 6.1.4 for UNIX)
1. Copy a similar "volume" file from another file system, i.e. if you
want to restore the label of I-206 use as sample file a copy of the
volume file of I-306.
2. Get the volume ID needed:
bash-2.03# mminfo -a -r'volid' I-206
742714369
Translate into Hex 742714369 -> 2C 44 EC 01
pattern: NN NN NN 01
Get and translate into Hex also the volid of the sample, I-306,
2717896961 -> A1 FF D1 01
pattern:
MM MM MM 01
3. Search with the hex editor the file /nsr/mm/mmvolume6/vol.0 for the
pattern 2C 44 EC
You will find e.g.
&237584: 2C 44 EC 01 42 2C 44 EC 0A 00
pattern: NN NN NN 01 XX NN NN NN II II
&237600: 2C 44 EC
pattern: NN NN NN
&237680: 42 2C 44 EC
pattern: XX NN NN NN
(you compute NN NN NN but you cannot guess the value of II II and XX)
The corresponding entries in the sample file (volume file of I-306)
&32900: A1 FF D1 01 41 A1 FF D1 00 08
pattern: MM MM MM 01 YY MM MM MM JJ JJ
&32972: 41 A1 FF D1
pattern: YY MM MM MM
&32992: A1 FF D1 01 41 A1 FF D1 00 08
pattern: MM MM MM 01 YY MM MM MM JJ JJ
overwrite in the sample file M by N, Y by X, J by I and the string I-306
by I-206 and you have reconstructed the lost I-206 volume file. It works!
I tested first in a test disk file to which I copied the new "volume"
file and a saveset from I-206. The test is "scanner -v <Test device>".
An analogue method should apply to overwritten tapes if the volume entry
in vol.0 is still present.
Lately I solved the problem of a broken disk file, all in lost+found:
fgrep -l "<volume string> /lost+found/\#* -> "volume" file found.
With "volume" file in / copy one after another (make perl script)
/lost+found/\#* to /1000000000.0
"scanner -v <Test device>" says: Expected 1234567890.0 found 1000000000.0
So you have detected 1234567890.0 ...
Use test device before. No warranties. You are on your own risk.
Yours,
Harald
--
Harald A. Irmer
ATIS - Abteilung Technische Infrastruktur
University of Karlsruhe Email: Harald.Irmer AT atis.uni-karlsruhe DOT de
Faculty of Computer Science WWW : http://atiswww.ira.uka.de
Building 50.34 Room-No. 009
Am Fasanengarten 5 Fon : +49 (721) 608-6963
D-76131 Karlsruhe / Germany Fax : +49 (721) 608-6699
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