>>>>> On Tue, 02 Oct 2007 00:11:25 +0200, Eric Yellin said: > > Hi, > > > I have a problem that occurred twice when trying to restore data from a > bacula labeled tape. I used "label barcodes" to label the tapes this > worked fine. Backups also completed without errors. However when I > needed to restore, things did not go so smoothly :-( Most tapes restored > just fine however in 2 occasions I received an error like the following: > > > Requested Volume "101077L1" on "Drive-1" (/dev/sa1) is not a Bacula > labeled Volume, because: ERR=block.c:957 Read zero bytes at 0:0 on > device "Drive-1" (/dev/sa1). > > > And then was requested to mount a tape with the same label. > > > From what I read in the list this means that a zero size file exists > before the label. I also read that using mt and dd it is somehow > possible to get the tape info and then even retrieve the data, I did not > however find out how exactly this can be done... > > So I have 2 questions: > > 1. Can I retrieve the backed up data from the problematic tape?
Probably not (see 2 below). If you want to see what the tape contains using unix tools, then load the tape into drive 1 and do mt -f /dev/nsa1 rewind dd if=/dev/nsa1 bs=64512 | od -c | head -40 mt -f /dev/nsa1 fsf dd if=/dev/nsa1 bs=64512 | od -c | head -40 mt -f /dev/nsa1 fsf dd if=/dev/nsa1 bs=64512 | od -c | head -40 mt -f /dev/nsa1 fsf dd if=/dev/nsa1 bs=64512 | od -c | head -40 This will show the headers of the first 4 tape files, which will contain info about the Bacula jobs if any. > 2. Is there a way I can prevent this error from repeating in the future? > If so how? I think you need to change the Archive Device options to /dev/nsa1 and /dev/nsa0, the non-rewinding devices. The current configuration uses the rewinding devices, so will overwrite the beginning of the tape each time it is opened. > I did test the changer with btape before going into production and it > gave me no errors. It is rather surprising that it worked with the rewinding devices (/dev/sa0 etc). __Martin ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2005. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ Bacula-users mailing list Bacula-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bacula-users
