DLT8000 > DLT7000 compatibility

[Megassini]

I need to make backup on a DLT8000 readable by a system with a DLT7000. The backup is done by OBII A.3.0 of the db (Informix).

[Volker Borowski]

If capacity is not critical, you should be able to use DLT III Media. This should be compatible to both of these.
Hope this helps.
Volker

[Alexander M. Ermes]

Hi there.
Should not be a problem.
Don't forget to import the tape in OB.
Rgds
Alexander M. Ermes

[Megassini]

The use of DLT III type should be critical because the db is of very generous dimension.
OBII on DLT7000 recognize as "blank" a DLT8000 written tape. I've tried to initialize a DLT tape on a DLT7000 system. So I've tried to backup on a DLT8000 system over that tape. And finally I've tryed to read the tape in OBII with a DLT7000 with no success.
So the problem is still not solved.

[Darrel Louis]

Make sure you have the latest stape patch installed.
Also check in the following file for the density used by each tape device:
/usr/include/sys/mtio.h
DLT 7000 uses 85937 bpi and 52 tracks.

mksf -C tape -I 6 -b 133 -c1
/dev/rmt/DLT_85937_52c

man mksf

[Darrel Louis]

Hi,

Is your problem solved now.
Check the following patch description aswell
PHCO_21596
# mksf -v -H 8/8.3.0 -d stape -b DLT_81633_64c /dev/rmt/DLT4000_compressed
# mksf -v -H 8/8.3.0 -d stape -b DLT_81633_64 /dev/rmt/DLT4000_uncompressed

Writing to the drive using these new device files will allow to read the tapes
on the DLT 4000 drive.

# /sbin/mksf -v -H 8/8.5.0 -d stape -b DLT_85937_52 -a /dev/rmt/DLT_35G
# /sbin/mksf -v -H 8/8.5.0 -d stape -b DLT_85937_52 -a -c /dev/rmt/DLT_70G

Writing tapes in the format readable for DLT-7000.