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тАО09-26-2003 05:07 AM
тАО09-26-2003 05:07 AM
How to copy one DLT tape to another across network?
I need to copy one DLT 7000 tape to another. I have two machines, each with a DLT 7000 drive, each running HP-UX 11. I can't seem to come up with anything more creative than using dd(1).
Anyone have any experience copying tapes from one machine to another? How did you do it?
Is dd going to work across the network? If so, what block size gives the best performance?
Btw, the original tape was created with fbackup(1M).
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тАО09-26-2003 05:22 AM
тАО09-26-2003 05:22 AM
Re: How to copy one DLT tape to another across network?
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тАО09-30-2003 03:08 AM
тАО09-30-2003 03:08 AM
Re: How to copy one DLT tape to another across network?
cat /dev/rmt/0mn|remsh dest "cat >/dev/rmt/0mn"
where you must replace with the appropriate device files and the appropriate hostname.
I would recommend you to use a more advanced backup soft for your backup; for example try:
afbackup : http://sourceforge.net/projects/afbackup.
Best regards,
Virgil
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тАО09-30-2003 05:39 AM
тАО09-30-2003 05:39 AM
Re: How to copy one DLT tape to another across network?
1.\ Count the number of "files" on your source tape:
please check fix syntax..
##/bin/ksh
mt -f /dev/rmt/0mn rew
tstat=0
while true;do
mt -f /dev/rmt/0mn fsf 1
if [ $? ne 0 ] ;then
break;
fi
tstat=($(tstat+1))
done
Echo "No. of files on tape: $tstat"
2.\ On target server, mount tape and do an mt rewind.
3.\ Do your dd:
mt rew
for i in 1 to $tstat;do
dd if=/dev/rmt/0mn | remsh otherserver "dd of=/dev/rmt/0mn
done
I cannot recall the block sizes I use.. try the default first...
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тАО10-01-2003 12:39 AM
тАО10-01-2003 12:39 AM
Re: How to copy one DLT tape to another across network?
Tapes tend to be slightly different lengths. This means that you've got a 50/50 chance of fitting one tape's data onto another. The other potential influence on this is the condition of the tape drive and media which this is being saved to. Dirty drives may not get as good compression as clean ones onto the media, so make sure the drive you're writing from is clean. Reading won't matter, since it'll either read or it won't.