Eric, Paul,
Thanks for all your help. Looks like we have a tape drive that's
going
south on us from the checks we've run over the weekend. We've
already got a new drive, just need to get it installed.
Scott
--- In amanda-users AT yahoogroups DOT com,
Eric Siegerman <erics@t...>
wrote:
> On Fri, Aug 20, 2004 at 07:08:47AM +0800, Scott Frisbie wrote:
> > Ran the revised shell and am attaching it to the mail along
with the
other files.
>
> Thanks. Unfortunately, all it does is convince me that some
> *really weird* stuff is going on :-(
>
> Running the headers through "od -c" was to prove to us
that what
> you'd shown in your email is what was really there, as opposed
to
> having been further corrupted by cut-and-paste, CTRL-M's causing
> parts of lines to be overwritten on the screen, etc.
>
> I am now convinced that what you showed was for real. Too bad;
I
> was really hoping that there were control characters in either
> amanda.conf or disklist that were causing this. There aren't.
>
> Here are those headers, turned back into plain text, but with
> non-printable characters turned into escape sequences:
>
> AMANDA: TAPESTART DATE 20040810 TAPE BootCamp207\n\f\n
> AMANDA: FILE 20040810 192.168.3.224 /home/shared/perllib lev
1
comp"N program /bin/gtar\nTo restore,"position tape at
start of file and
run:\n\tdd if=<tape>"bs=32k skip\xBD1"| /bin/gtar
-f... -\n\f\n
> AMANDA: FILE 20040810 nis /var/lib/dhcp lev 0 comp N program
/bin/gtar\nTo restore, position tape at start\xA0of file and
run:\n\tdd
if=<tape> bs=32k skip=1 | /bin/gtar -f... -\n\f\n
> AMANDA: FILE 20040810 intrepid /usr/shares/marketing lev 1
comp"N program /bin/gtar\nTo restore,"position tape at
start of file and
run:\n\tdd if=<tape>"bs=32k skip\xBD1"| /bin/gtar
-f... -\n\f\n
> AMANDA: FILE 20040810 cvs /etc lev 0 comp"N program
/bin/gtar\nTo restore,"position tape at start of file and
run:\n\tdd
if=<tape>"bs=32k skip\xBD1"| /bin/gtar -f... -\n\f\n
> AMANDA: FILE 20040810 intrepid
/home/mailhub/scottf/recover_test
lev 0 comp"N program /bin/gtar\nTo restore, position tape at
start of file
and run:\n\tdd if=<tape>"bs=32k skip\xBD1"| /bin/gtar
-f... -\n\f\n
> AMANDA: FILE 20040810 192.168.3.224
/home/odin/reports/scripts
lev 1 comp"N program /bin/gtar\nTo restore,"position tape
at start of file
and run:\n\tdd if=<tape>"bs=32k skip\xBD1"| /bin/gtar
-f... -\n\f\n
> AMANDA: FILE 20040810 nis /var/yp lev"0 comp N program
/bin/gtar\nTo restore, position\xA0tape at start\xA0of file and
run:\n\tdd
if=<tape> bs=32k skip=1"| /bin/gtar -f... -\n\f\n
> AMANDA: FILE 20040810 192.168.3.224 /home/odin/stats lev 1
comp"N program /bin/gtar\nTo restore,"position tape at
start of file and
run:\n\tdd if=<tape>"bs=32k skip\xBD1"| /bin/gtar
-f... -\n\f\n
> AMANDA: FILE 20040810 nis /var/named lev 0 comp"N
program
/bin/gtar\nTo restore,"position tape at start of file and
run:\n\tdd
if=<tape>"bs=32k skip\xBD1"| /bin/gtar -f... -\n\f\n
> AMANDA: FILE 20040810 intrepid /usr/shares/support lev 1
comp"N
program /bin/gtar\nTo restore, position tape at start of file and
run:\n\tdd
if=<tape> bs=32k skip\xBD1"| /bin/gtar -f... -\n\f\n
> AMANDA: FILE 20040810 192.168.3.224 /etc lev 0 comp"N
program
/bin/gtar\nTo restore, position tape at start of file and run:\n\tdd
if=<tape>
bs=32k skip\xBD1"| /bin/gtar -f... -\n\f\n
> AMANDA: FILE 20040810 nis /etc lev 0 comp"N program
/bin/gtar\nTo restore, position tape at start of file and run:\n\tdd
if=<tape>"bs=32k skip\xBD1"| /bin/gtar -f... -\n\f\n
> AMANDA: FILE 20040810 intrepid /usr/shares/IT_Dept lev 0
comp"N
program /bin/gtar\nTo restore, position tape at start of file and
run:\n\tdd
if=<tape> bs=32k skip\xBD1"| /bin/gtar -f... -\n\f\n
> AMANDA: FILE 20040810 intrepid /home/amanda lev 1 comp N
program /bin/gtar\nTo restore, position\xA0tape at start\xA0of file
and
run:\n\tdd if=<tape> bs=32k skip=1"| /bin/gtar -f...
-\n\f\n
> AMANDA: FILE 20040810 intrepid /home/archive lev 0
comp"N
program /bin/gtar\nTo restore, position tape at start of file and
run:\n\tdd
if=<tape> bs=32k skip\xBD1"| /bin/gtar -f... -\n\f\n
> AMANDA: FILE 20040810 intrepid /home/snips lev 0 comp"N
program /bin/gtar\nTo restore, position tape at start of file and
run:\n\tdd
if=<tape> bs=32k skip\xBD1"| /bin/gtar -f... -\n\f\n
> AMANDA: FILE 20040810 intrepid /home/os-iso lev"1 comp
N
program /bin/gtar\nTo restore, position\xA0tape at start\xA0of file
and
run:\n\tdd if=<tape> bs=32k skip=1"| /bin/gtar -f...
-\n\f\n
> AMANDA: FILE 20040810 intrepid /home/sus lev 0 comp"N
program
/bin/gtar\nTo restore,"position tape at start of file and
run:\n\tdd
if=<tape>"bs=32k skip\xBD1"| /bin/gtar -f... -\n\f\n
> AMANDA: FILE 20040810 intrepid /etc lev"0 comp N
program
/bin/gtar\nTo restore, position\xA0tape at start of file and
run:\n\tdd
if=<tape> bs=32k skip=1"| /bin/gtar -f... -\n\f\n
> AMANDA: FILE 20040810 intrepid /usr/shares/integration lev 2
comp"N program /bin/gtar\nTo restore, position tape at start of
file and
run:\n\tdd if=<tape> bs=32k skip\xBD1"| /bin/gtar -f...
-\n\f\n
> AMANDA: FILE 20040810 192.168.3.224 /var/lib/mysql lev 1
comp"N
program /bin/gtar\nTo restore,"position tape at start of file
and run:\n\tdd
if=<tape>"bs=32k skip\xBD1"| /bin/gtar -f... -\n\f\n
> AMANDA: FILE 20040810 cvs /usr/CVS lev 0 comp N program
/bin/gtar\nTo restore, position tape at start of file and run:\n\tdd
if=<tape>
bs=32k skip\xBD1"| /bin/gtar -f... -\n\f\n
> AMANDA: FILE 20040810 192.168.3.224 /usr/archive lev 0 comp
N
program /bin/gtar\nTo restore, position tape at start of file and
run:\n\tdd
if=<tape> bs=32k skip\xBD1"| /bin/gtar -f... -\n\f\n
> AMANDA: TAPEEND\xA0DATE 20040810\n\f\n
>
> Here's the same thing, with the *expected* variations (host,
> path, dumplevel) ironed out, and the results run through
> "sort | uniq -c":
>
> 2 AMANDA: FILE 20040810 HOST PATH lev # comp N program
/bin/gtar\nTo restore, position tape at start of file and run:\n\tdd
if=<tape>
bs=32k skip\xBD1"| /bin/gtar -f... -\n\f\n
> 1 AMANDA: FILE 20040810 HOST PATH lev # comp N program
/bin/gtar\nTo restore, position tape at start\xA0of file and
run:\n\tdd
if=<tape> bs=32k skip=1 | /bin/gtar -f... -\n\f\n
> 1 AMANDA: FILE 20040810 HOST PATH lev # comp N program
/bin/gtar\nTo restore, position\xA0tape at start\xA0of file and
run:\n\tdd
if=<tape> bs=32k skip=1"| /bin/gtar -f... -\n\f\n
> 6 AMANDA: FILE 20040810 HOST PATH lev # comp"N program
/bin/gtar\nTo restore, position tape at start of file and run:\n\tdd
if=<tape>
bs=32k skip\xBD1"| /bin/gtar -f... -\n\f\n
> 2 AMANDA: FILE 20040810 HOST PATH lev # comp"N program
/bin/gtar\nTo restore, position tape at start of file and run:\n\tdd
if=<tape>"bs=32k skip\xBD1"| /bin/gtar -f... -\n\f\n
> 8 AMANDA: FILE 20040810 HOST PATH lev # comp"N program
/bin/gtar\nTo restore,"position tape at start of file and
run:\n\tdd
if=<tape>"bs=32k skip\xBD1"| /bin/gtar -f... -\n\f\n
> 1 AMANDA: FILE 20040810 HOST PATH lev"# comp N program
/bin/gtar\nTo restore, position\xA0tape at start of file and
run:\n\tdd
if=<tape> bs=32k skip=1"| /bin/gtar -f... -\n\f\n
> 2 AMANDA: FILE 20040810 HOST PATH lev"# comp N program
/bin/gtar\nTo restore, position\xA0tape at start\xA0of file and
run:\n\tdd
if=<tape> bs=32k skip=1"| /bin/gtar -f... -\n\f\n
> 1 AMANDA: TAPEEND\xA0DATE 20040810\n\f\n
> 1 AMANDA: TAPESTART DATE 20040810 TAPE BootCamp207\n\f\n
>
> Things to notice:
> 1. Some of the spaces have been turned into \xA0
> (which is ' ' | 0x80)
>
> 2. Some of the "="s have been turned into \xBD
> (which is '=' | 0x80; hmmm...)
>
> 3. Some of the spaces have been turned into '"'
> (which is *not* ' ' | 0x80)
>
> 4. (3) can happen anywhere from 0-4 times in a given header,
but
> at fairly predictable places
>
> 5. No characters other than ' ' and '=' have been corrupted
>
> I don't have a clue what all this means, I'm afraid. It still
> doesn't smell like hardware data corruption -- it's not
> completely regular, but it is semi-regular. Still, to rule that
> out, it'd be interesting (to put it mildly) to see whether
> similar corruption is occurring in the actual backup data as
well
> as in the headers. Try this:
> 1. Run a test backup *without* a tape in the drive; it'll run
in
> degraded mode, leaving the backups in the holding disk
>
> 2. Copy the backups out of the holding disk to a temporary
> location
>
> 3. Run amflush
>
> 4. DD the backups off of the tape -- do *not* try to use
> amrestore or amrecover; we want the bits exactly as they're
> on tape, except that we use "bs=32k skip=1" to
discard the
> same headers we were examining above:
> dd bs=32k skip=1 <$TAPEDEV >file
>
> 5. Similarly, peel the headers off of the holding-disk-file
> copies. That looks similar to step 4:
> dd bs=32k skip=1 <file1 >file2
>
> 6. Compare the corresponding files from steps 4 and 5. (Most
> diff's other than GNU diff can't handle binary files, so use
> cmp instead). (Note that for huge backups -- by default,
> ones greater than 2 GB -- the holding-disk data will be
split
> into several files, which you'll have to reassemble before
> doing the comparison.)
>
> Of course we expect the files from steps 4 and 5 to be
identical;
> if they're not, you've almost certainly got hardware problems.
>
> If the files *are* identical -- especially on sizeable backups
--
> but the headers show the same sort of weirdness as before, I
> won't know what to make of that :-(
>
> --
>
> | | /\
> |-_|/ > Eric Siegerman, Toronto, Ont. erics@t...
> | | /
> It must be said that they would have sounded better if the
singer
> wouldn't throw his fellow band members to the ground and toss
the
> drum kit around during songs.
> - Patrick Lenneau
--
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