Exabyte 8mm Video Tape Drive Review?
Dave Axness
wor-mein!dave at uunet.uu.net
Thu Feb 23 14:19:17 AEST 1989
scott at csis.oz.au (Scott MILTON) writes:
> We have found it necessary to do dumps by piping to dd, instead of using
> rdump. Doing:
> rdump 0f tapehost:/dev/nrst1 /dev/rxy0a
> rrestore 0tf tapehost:/dev/nrst1
> fails, while
> dump 0f - /dev/rxy0a | rsh tapehost dd of=/dev/nrst1 bs=20b
> rsh tapehost dd if=/dev/nrst1 bs=20b| restore 0tf -
> works....
I have an Exabyte connected to a SUN that I've been using for several
months now. I would like to use it for my MicroVAX but haven't because of
the slow throughput of rdump. I tried your suggestion of using rsh and dd
to keep the Exabyte streaming and it seems to work. I was able to dump
and restore files from the MicroVAX disk to the Exabyte connected to the
SUN ( I even used the -i option on restore ). I used a blocksize of 64k
instead of 20b.
The question I have is how to do a restore when multiple partitions were
dumped from the VAX to the Exabyte via rsh and dd. For example, on my
SUN, I dump about 11 partitions to one tape on the Exabyte. To restore a
specific partition, I use "mt fsf {# of dumps to skip}" and then do my
restore.
I tried dumping 2 partitions from the VAX to the Exabyte using rsh and dd
(which seemed to work) but when I tried to do the restore, I was unable to
locate the 2nd partition. I tried the following:
rsh tapehost mt -f /dev/nrst9 fsf 1
rsh tapehost dd if=/dev/nrst9 bs=64k | restore 0tf -
All I got was the first partition that I dumped. I don't know enough
about dd to understand if this should work or not. Any information would
be greatly appreciated.
Thanks,
Dave Axness
Quantum Medical Systems
Issaquah, WA
uunet!wor-mein!dave
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