Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!swrinde!elroy.jpl.nasa.gov!lll-winken!taco!news!henkel%nepjt From: henkel%nepjt@ncsuvx.ncsu.edu (Chuck Henkel) Newsgroups: comp.unix.aix Subject: "rdump" only writes half as much data as "backup" Message-ID: Date: 13 Jun 91 06:48:46 GMT Sender: news@ncsu.edu (USENET News System) Reply-To: henkel@nepjt.ncsu.edu (Chuck Henkel) Organization: North Carolina State University, Raleigh Lines: 29 Context: Two RS/6000 Model 320s running 3001. Tape drive configured for 512 byte blocks, no ECC I'm trying to use rdump to back up a filesystem on "rs1" to a cartridge tape on "rs2": rdump -0 -c -f rs2:/dev/rmt0.4 /u only writes about 10 meg on the tape, then asks for another. If I use a high density tape, (3M 6150, /dev/rmt0), it only puts about 20 meg on the tape, then asks for another. The "-b" flag (blocksize) has no apparent effect. Backing up filesystems on rs2 (the machine with the tape) works fine. What's the deal? And, why doesn't this work: backup -0 -b 126 -f - /u | rsh rs2 dd of=/dev/rmt0 obs=126 The dd dies immediately with "invalid argument to system call" or somesuch. In fact, I can't get dd to write on the tape at all. -- | Chuck Henkel | | | Department of Nuclear Engineering | Support nuclear power. | | N.C. State University | | | henkel%nepjt@ncsuvx.ncsu.edu | |