On Wed, 2005-03-02 at 10:49 -0500, Guy wrote: > You did: > dd if=/dev/zero of=/dev/nst0 bs=1M and different mt setblk > > Since tape drives can compress data, /dev/zero is a bad source of data, > since it compresses real good. /dev/urandom is a better source. > > You would like IBM's LTO-2 tape drive. It does 35M/s! They claim the LTO-3 > does 70M/s! > > Guy > I did want the tape to do NOTHING. It's a test of the SCSI transfer speed, handshake etc. When compression is on the tape has to write file marks and very little information. So you get the real transfer performance. Not the performance of the tape.
GS
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Gerhard Schneider
Institute of Lightweight Design and e-Mail:[EMAIL PROTECTED]
Structural Biomechanics (E317) Tel.: +43 1 58801 31716
Vienna University of Technology / Austria Fax: +43 1 58801 31799
A-1040 Wien, Gusshausstrasse 27-29 http://www.ilsb.tuwien.ac.at/~gs/
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