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Newsgroups: comp.os.386bsd.questions Path: sserve!newshost.anu.edu.au!munnari.oz.au!constellation!convex!convex!cs.utexas.edu!math.ohio-state.edu!howland.reston.ans.net!spool.mu.edu!torn!mcshub!flex1!todd From: todd@flex.eng.mcmaster.ca (Todd Pfaff) Subject: backup of DOS partition Message-ID: <1993Oct27.035034.11525@mcshub.dcss.mcmaster.ca> Sender: usenet@mcshub.dcss.mcmaster.ca Nntp-Posting-Host: flex1.eng.mcmaster.ca Reply-To: todd@flex.eng.mcmaster.ca Organization: McMaster University Date: Wed, 27 Oct 1993 03:50:34 GMT Lines: 25 I use the following in 386bsd to backup a DOS partition to an Exabyte tape drive on a Sun server over Ethernet. dd if=/dev/wd0d count=204848 | rsh tapehost dd of=/dev/nrst9 /dev/wd0d is the entire disk and the DOS parition occupies the first 204848 sectors. This is quite slow; it takes about 45 minutes to complete. Can anybody suggest a faster method? What is likely the bottleneck (disk reads, network, tape writes)? The server and network are not under any load at the time. Could I optimize the use of the network by specifying an output block size for the first dd command? Is there a better way to do this than with dd and rsh? --- Todd Pfaff \ Internet: todd@flex.eng.mcmaster.ca Dept. of Mechanical Engineering \ Voice: (905) 525-9140 x22902 McMaster University \ FAX: (905) 572-7944 Hamilton, Ontario, CANADA L8S 4L7 \