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Home > Archive > Unix True 64 > July 2006 > Looking for ADVFS image.
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| Author |
Looking for ADVFS image.
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| Hi,
We're trying to recover data from a badly corrupted adfs filesystem. So
far, reverse engineering a unix-like filesystem was always less than a
day's work. Advfs has us stumped. Does anybody know of documentation
about the internals (on-disk-format) of advfs? So far we havent been
able to dig up much besides tru64 manuals and tuning guides. These
provide some hints, but not enough.
Lacking that I would be much helped with a filesystem with "known"
contents, and its image.
Would someone here be willing to zip a smallish partition, and send it
to me along with the output of find [partition] -ls ?
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| Bob Harris 2006-04-11, 9:55 am |
| In article
<1144134711.963420.102100@i39g2000cwa.googlegroups.com>,
"rew" <rew-googlegroups@bitwizard.nl> wrote:
> Hi,
>
> We're trying to recover data from a badly corrupted adfs filesystem. So
> far, reverse engineering a unix-like filesystem was always less than a
> day's work. Advfs has us stumped. Does anybody know of documentation
> about the internals (on-disk-format) of advfs? So far we havent been
> able to dig up much besides tru64 manuals and tuning guides. These
> provide some hints, but not enough.
>
> Lacking that I would be much helped with a filesystem with "known"
> contents, and its image.
>
> Would someone here be willing to zip a smallish partition, and send it
> to me along with the output of find [partition] -ls ?
Why not use the salvage utility provided with Advfs?
/sbin/advfs/salvage
Have you tried fixfdmn?
/sbin/advfs/fixfdmn
Man pages should be available for both of these commands, and if
not, you can find them with a google search, and of course direct
from the HP Tru64 UNIX web site
http://h30097.www3.hp.com/docs/base...N/V51B_HTML/MAN
/MAN8/0504____.HTM
http://h30097.www3.hp.com/docs/base...N/V40F_HTML/MAN
/MAN8/0291____.HTM
If your system does not have the latest versions, customer support
can provide copies.
Bob Harris
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| hnispel 2006-04-27, 7:53 am |
| Hi,
it seems we both share a similar problem, see my post:
Advfs domain attached to MSA1000 does not mount after reboot: "I/O
error"
Did the same happen to you?
Thankfully it seems that Bob is willing to give it a thought, so I
would like to update what I found/tested together with HP support:
mount -dirty does not work (biggest hope of the HP guy).
With dd I can access the device and see that there is valid data.
Suggestion was that somewhere during reboot a write to the raid might
be booked by Tru64 as being executed, but somehow the MSA1000 did not
write to the raid.
So the only option is using salvage, but as mentioned afte 16h runtime
it used 21GB of RAM, but no output.
Over easter I will give it another try.
Any other idea to get it running again, maybe write some default value
to the device with dd, or any other magic?
That person will receive a easter present deluxe!!!
Happy easter
Harald
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| jdeanbrock 2006-07-04, 11:30 pm |
| I happened upon this posting through a google search. DEC/Compaq/HP had internal documentation of the on-disk structure. It would be quite a challenge to go through the on-disk structures to find data. |
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