On Thursday 26 June 2003 05:13, Susanne und Stefan Noll wrote:
>Alexander JOLK wrote:
>>>NOTES:
>>>taper: tape met053 kb 17996640 fm 21 writing file: No space left
>>> on device taper: retrying
>>> localhost:/home/samba/projekte/Laufende.0 on new tape: [writing
>>> file: No space left on device]
>>>taper: tape met055 kb 17488544 fm 1 writing file: Input/output
>>> error taper: retrying localhost:/home/samba/projekte/Laufende.0
>>> on new tape: [writing file: Input/output error]
>>>taper: tape met054 kb 0 fm 0 [OK]
>>
>>You seem to be running out of space on a 20GB tape after 18GB have
>> been written.  That sounds a little bit like you are using
>> hardware compression (that actually expands your pre-compressed
>> data when writing to tape).  This issue has been discussed several
>> times already on the list.
>>
>>Apart from that, the second error message reads `Input/output
>> error' rather than `No space left', so it might be you ran into a
>> bad tape.
>>
>>Alex
>
>Thanks for your tipps.
>I disabled the hardware compression with:
>mt -f /dev/nst0 compression off

This may be insufficient to make it stay off.  It will reset to the 
dipswitch set default when the next tape is inserted.   So first, 
find the dip switch that sets that up and turn it off.

I've found here, on DDS tapes, that a tape once written to with 
compression turned on, really wants to be compressed forever and its 
rather convoluted to get it turned back off because this is actually 
recorded on the tape in a header that apparently only the drive knows 
about.  Some drives will still report that its on, but only for the 
label block even after having been thru this 'fixcomp' script:
---------------
#!/bin/sh
if [ `whoami` != 'root' ]; then
        echo
        echo "!!!!!!!!!!!!!!!!! Warning !!!!!!!!!!!!!!!!!!"
        echo "fixcomp needs to be run by the user root,"
        echo "else the perms on some commands will be denied."
        echo
        exit 1
fi

# I have a seperate from amanda stuff dir where I play with things 
# like this.
cd /amanda

# blatently stolen from the bash manual
NUMBERS="0 1 2 3"
for number in $NUMBERS
do 
        echo "amtape DailySet1 slot "$number
        su amanda -c 'amtape DailySet1 slot '$number
# set variable block size
        mt -f /dev/nst0 setblk 0
        mt -f /dev/nst0 rewind
# ask for a read thats going to be bigger than the label block
# a normal label file is 32k.
        dd if=/dev/st0 of=./scratch bs=64K count=1
        ls -l ./scratch # show how big if you care
        mt -f /dev/nst0 compression off
        mt -f /dev/nst0 defcompression -1
# re-write the label blocks with orig info
        dd if=./scratch of=/dev/nst0 bs=32K conv=sync
        mt -f /dev/nst0 tell # show how many blocks it was
        # This _might_ get rid of compressed headers
        echo "forcing buffer flush with an 4+ meg write to tape # "$number
        # it doesn't always work!
        dd if=/dev/zero bs=32K count=130 of=/dev/st0 
        echo "Now reading the label"
        dd if=/dev/st0 bs=32K
        mt -f /dev/st0 status
done
exit 0
-------------------
adjust NUMBERS for however many tapes fits in your magazine if you 
have a changer.  Mine holds 4 tapes and I run this everytime I change 
the tapes in the magazine.  Or remove the loop completely if doing it 
one tape at a time.

-- 
Cheers, Gene
AMD K6-III@500mhz 320M
Athlon1600XP@1400mhz  512M
99.26% setiathome rank, not too shabby for a WV hillbilly
Yahoo.com attornies please note, additions to this message
by Gene Heskett are:
Copyright 2003 by Maurice Eugene Heskett, all rights reserved.