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Date:      11 Apr 2002 05:09:14 -0000
From:      mattv@iinet.net.au
To:        mvillion@ddd.com
Subject:   DLT Strangeness
Message-ID:  <20020411050914.26656.qmail@webmail2.iinet.net.au>

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Greetings,

I have added a DLT 7000 tape device to my FreeBSD box and it appears that 
I am not getting the 'advertised' amount of data on to a tape.

I am addressing the device via /dev/nrsa0 and it works ok (I can push to 
tape and extract) except that I am only getting about 20 gig of data onto 
a Tape marked 35 Gig Native / 70 Gig compressed.  I need to state here 
that the data being loaded onto the tape in heavily compressed RAR files.  
Each file is over 1 gig each in size and I am using the tar command to 
perform the backup.  About 18 files in total.

tar -cv -b 64 -f /dev/nrsa0 filename to push the files on to the tape.

I have confirmed the lights on the drive correctly identify the tape and 
have tried both compressed and uncompressed format density override just 
incase that was adding something strange.

I have tried two tape drives with brand new media in case that was the 
problem.  Nothing made a difference
As of yet I am at a complete loss to explain what I am seeing.

Can anyone offer any suggestions.

Thanks in advance

Matt Villion

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