The original Message I posted:
Trying to recover the data on a disk that has had a new disklabel
written to it and then we used dxadvfs to create a file domain and file
set. Is it still possible to recover the data on the disk? My fear is
that the make fdmn and fileset has lost the data on the disk?
Also, our backup for the disk is only 70% so we're in real trouble.
*******
SUMMARY:
REPLY #1:
FROM: alan_at_nabeth.cxo.dec.com
Creating the new domain wouldn't have overwritten many
of the data blocks, if any. So, much of the data is
intact. Finding it will be the hard part. It should
be possible to write a program that will scan for certain
interesting data patterns; strings of printable characters
and white space starting on block boundaries and ending
on block boundaries or with NULs.
If you're lucky you might able to assume that everything
interesting is on 8 KB boundaries, which makes searching
easier.
REPLY #2:
FROM: Knut.Hellebo_at_nho.hydro.com
> My fear is that the make fdmn and fileset has lost the data on the disk?
>
Unfortunately I must say that you're right ....
REPLY #3:
FROM: ufpelrm_at_eu.ansp.br
If you did not run mkfset, rmfset or mkfdmn, I believe you will be able
to recover the information restoring the file domain by hand.
Try to rebuild the file domain. Go to /etc/fdmns and issue the following
commands:
# mkdir recover_domain
# cd recover_domain
# ln -s /dev/rz?? . <-- Use _your_ partition name here, for example
/dev/rz3c
# /sbin/showfsets recover_domain
This must generate a fileset listing like the following:
# showfsets home_domain
/etc/fdmns/pub_domain
home
Id : 312c7455.0003a240.1.8001
Files : 12213, SLim= 0, HLim= 0
Blocks (512) : 3396414, SLim= 0, HLim= 0
Quota Status : user=on group=on
If you can list the filesets, you can mount them
# mount recover_domain#filesetname /mnt
I hope this helps.
______________________
Thanks for all the replies, UNFORTUNATELY, it seems that because we
used dxadfvs and gave the disk a new file domain, the data can not be
read.
We are attempting to contact places that do data recovery and are
getting some quotes from them (it is very expensive).
Thanks,
Marta
--
_______******__________******__________********____________*******____________
Marta L. Martinez,Ph.D. martav_at_mailhost.tcs.tulane.edu
PostDoctoral Fellow
Dept. of Biomedical Engineering W=(504)896-5899
Tulane University (504)865-5897
New Orleans, LA 70118 Fax =(504)862-8779
_______******__________******__________********____________********___________
Received on Tue Sep 10 1996 - 01:07:25 NZST