Date: Fri, 20 Oct 1995 11:14:07 -0400 (EDT) From: "Jonathan M. Bresler" <jmb@kryten.Atinc.COM> To: john@starfire.mn.org Cc: FreeBSD questions <questions@FreeBSD.org> Subject: Re: efficient use of large tapes Message-ID: <Pine.3.89.9510201143.H4689-0100000@kryten.atinc.com> In-Reply-To: <199510201417.JAA12371@starfire.mn.org>
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On Fri, 20 Oct 1995 john@starfire.mn.org wrote: > I really like using dump/restore, but I am not confident of putting multiple > sets on one tape, yet is seems a shame to use four 2Gb tapes to back up > a 1Gb disk. Does anyone have some neat solutions? a couple tricks. use the non-rewind devices (eg /dev/nrst0...its the 'n' that counts) otherwise the tape rewinds between each dump and only the last dump remains ;O set the blocksize and number of blocks large enought to cover the expanse of tape that you need. but bewarned, you run out of tape--you lose. game over, man. for a 4mm scsi tape drive, i use: #!/bin/sh echo "" >> dump.log echo "" >> dump.log echo "" >> dump.log /usr/bin/mt -f /dev/rst0 rewind /sbin/dump 0unBbf 1200000 10 /dev/nrst0 /dev/sd1a 2>&1 | tee -a /root/dump.log /sbin/dump 0unBbf 1200000 10 /dev/nrst0 /dev/sd1e 2>&1 | tee -a /root/dump.log /sbin/dump 0unBbf 1200000 10 /dev/rst0 /dev/sd1f 2>&1 | tee -a /root/dump.log /usr/bin/mt -f /dev/rst0 rewoffl > > John Lind, Starfire Consulting Services > E-mail: john@starfire.MN.ORG USnail: PO Box 17247, Mpls MN 55417 > Jonathan M. Bresler jmb@kryten.atinc.com | Analysis & Technology, Inc. FreeBSD Postmaster jmb@FreeBSD.Org | 2341 Jeff Davis Hwy play go. | Arlington, VA 22202 ride bike. hack FreeBSD.--ah the good life | 703-418-2800 x346
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