Hi Carsten,
Am 19.11.2012 20:13, schrieb Carsten Gnörlich:
Rogério already summed it up perfectly. Just to add some more
technical info: It's not too uncommon to see a drive freeze in midst
of fulfilling a SCSI request on faulty media due to bugs in its firmware. While this may freeze the calling
application and maybe
even the whole system if one was unlucky enough to have the root
file system on the same SCSI subsystem, remedy is usually possible by
a) pushing eject on the drive, which is totally unspecified and
unexpected behaviour, but may actually reset the drive and abort
the stuck SCSI command; or by
In my case this does not help.
b) simply waiting for the SCSI timeout specified by the application.
When the timeout is reached, the kernel will abort and unlock the
failed command, and the system will come back to life again.
I would say i have waited for about 5 minutes.
Before i shutdown the system i tested if the processes still exists.
None of the processes did disappear.
On dvdisaster the timeout is 10min. While this might seem a high value,
please resist the temptation to fiddle with it.
O.K.
In Karstens case, the drive was probably already stuck before calling
dvdisaster.
Yes - of course - the first thing i tried was just to read the CD.
But the CD was so bad that it was not recognized.
It was my second idea to use dvdisaster to check the CD.
I tested the CD on 3 different drives and i could read it only on the 4th drive.
Yesterday it was possible to read the file on the first drive, that's really
interesting.
Since dvdisaster queries all connected drives for some
of their properties while preparing its main window, it hung up right
off the box. In command line mode, the failure would probably have been
deferred until the first read operation. But anyways, these are really
firmware bugs which can only be corrected by the drive manufacturer,
and neither the kernel nor dvdisaster can work around them in a meaningful way.
It's very simple why i rise this bug.
I give up to use CD's and DVD's, because they are more expensive and reliable
than hard disks.
The other thing is that my DVD-burner GH22NP20 has give up to write after only
a few DVD's in 2 years.
So the last time i use dvdisaster was on debian squeeze.
I assumed that it was not working any more after my upgrade to wheezy.
That's all.
Greetings,
Carsten
Thank you all for your advise.
Cheers
Karsten
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