On Thu, Nov 10, 2005 at 12:45:19PM -0000, knappenschaenke wrote:
> --- In amanda-users AT yahoogroups DOT com, Jon LaBadie <jon@j...> wrote:
> >
> > So a write comparable to your tar command succeeded. Then amanda
> > rewound the tape and started a second write. That is when it
> failed.
> > Perhaps you could run a test that more closely matches amanda's
> code
> > by putting the following into a shell script and running it.
> >
> > mt -f /dev/nst0 rewind
> > dd bs=32k if=/dev/random of=/dev/nst0 count=4000
> > mt -f /dev/nst0 rewind
> > dd bs=32k if=/dev/random of=/dev/nst0 count=4000
> >
> > It looks to me like the installation, or the configuration,
> > of the drive is the problem.
> >
>
> --------------------------------------------
> First
> --------------------------------------------
> asterix: # mt -f /dev/nst0l rewind
> asterix: # dd bs=32k if=/dev/random of=/dev/nst0 count=1000
> 0+1000 Datensätze ein
> 0+1000 Datensätze aus
> 13917 bytes (14 kB) copied, 5149,72 seconds, 0,0 kB/s
>
> ---------------------------------------------
> Second
> ---------------------------------------------
> asterix: # mt -f /dev/nst0l rewind
> asterix: # dd bs=32k if=/dev/random of=/dev/nst0 count=1000
> 0+1000 Datensätze ein
> 0+1000 Datensätze aus
> 12938 bytes (14 kB) copied, 5764,14 seconds, 0,0 kB/s
>
> So I didn´t test it with count=4000 !
I failed to explain why I wanted it in a shell script.
I specifically did not want the delay that is caused
by a human typing in the commands. I sometimes see
with my drive (a dds3) a return from a rewind before
the drive is really ready for the next command. There
was a chance that your drive and driver behaves similarly.
I need a delay after a rewind.
HOWEVER, your dd commands show something is seriously wrong
having nothing to do with amanda.
The bs=32k option set the block size to 32 KiloBytes each,
and count option asked dd to write 1000 of them for a total
of 32 MegaBytes. Yet the report from dd shows that not even
a single complet block (0+...) blocks were written. Only
14 KBytes total in what, over 5000 seconds? Somethings wrong.
--
Jon H. LaBadie jon AT jgcomp DOT com
JG Computing
4455 Province Line Road (609) 252-0159
Princeton, NJ 08540-4322 (609) 683-7220 (fax)
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