Date: Wed, 08 May 2002 22:34:21 -0700 From: paul beard <paulbeard@mac.com> To: stable@FreeBSD.ORG Subject: Re: question on dump(8) and SCSI tape drive Message-ID: <3CDA0A5D.6070803@mac.com> References: <Pine.A41.3.96.1020509012335.107124B-100000@cortez.sss.rpi.edu>
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Lawrence S. Lansing wrote: >>I just installed a DDS-2 tape drive (Archive/Seagate Peregrine >>with HW compression) and want to do some backups. From what I can >>tell, a 120m tape should hold 4 Gb of uncompressed data and 8 Gb >>compressed. I'm puzzled why dump(8) wants 2 tapes to backup 77+ Mb >>of data (the / partition below) and 44% of a tape for /var (16 Mb). >> >> DUMP: estimated 77567 tape blocks on 1.99 tape(s). > > > What flags are you giving "dump"? What's the command line you are typing? > I give dump the -a flag: > > -a ``auto-size''. Bypass all tape length considerations, and > enforce writing until an end-of-media indication is returned. > This fits best for most modern tape drives. Use of this option > is particularly recommended when appending to an existing tape, > or using a tape drive with hardware compression (where you can > never be sure about the compression ratio). > > -Larry Lansing That's what I was thinking was the problem (I couldn't make out how dump figured out 44% of what?). Thanks: things seem to be moving more smoothly now. -- Paul Beard 8040 27th Ave NE Seattle WA 98115 206 529 8400 The economy depends about as much on economists as the weather does on weather forecasters. -- Jean-Paul Kauffmann To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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