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From: ivan@nauplius.rsmas.miami.edu (Ivan Lima)
Newsgroups: comp.unix.bsd.freebsd.misc
Subject: Question about dump
Date: 9 Apr 1997 16:51:59 GMT
Organization: RSMAS/University of Miami
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I am trying to back up my /usr partition to a tape drive using dump.
The tape drive is a SCSI Seagate TapeStor 8000 and the QIC-3080 tape
holds 4 MB (without compression).
Well, if I use "dump -u0f /dev/rst0 /usr", dump asks for more tapes
(14.13 tapes). But The tape cartrige holds 4 MB umcompressed so one tape
(volume) should be more than enough.
#superuser#> dump -u0f /dev/rst0 /usr
DUMP: Date of this level 0 dump: Wed Apr 9 11:38:03 1997
DUMP: Date of last level 0 dump: the epoch
DUMP: Dumping /dev/rwd0s1e (/usr) to /dev/rst0
DUMP: mapping (Pass I) [regular files]
DUMP: mapping (Pass II) [directories]
DUMP: estimated 549662 tape blocks on 14.13 tape(s).
DUMP: dumping (Pass III) [directories]
DUMP: dumping (Pass IV) [regular files]
DUMP: Closing /dev/rst0
DUMP: Change Volumes: Mount volume #2
DUMP: Is the new volume mounted and ready to go?: ("yes" or "no")
However if I use "dump -u0f - /usr > /dev/rst0" (dump to stdout and
redirect it to /dev/rst0) I get everything in one tape without
problems:
#superuser#> dump -u0f - /usr > /dev/rst0
DUMP: Date of this level 0 dump: Wed Apr 9 11:46:06 1997
DUMP: Date of last level 0 dump: the epoch
DUMP: Dumping /dev/rwd0s1e (/usr) to standard output
DUMP: mapping (Pass I) [regular files]
DUMP: mapping (Pass II) [directories]
DUMP: estimated 549429 tape blocks.
DUMP: dumping (Pass III) [directories]
DUMP: dumping (Pass IV) [regular files]
DUMP: 14.42% done, finished in 0:29
DUMP: 29.92% done, finished in 0:23
DUMP: 45.03% done, finished in 0:18
DUMP: 60.48% done, finished in 0:13
DUMP: 75.99% done, finished in 0:07
DUMP: 91.10% done, finished in 0:02
DUMP: DUMP: 575663 tape blocks
DUMP: level 0 dump on Wed Apr 9 11:46:06 1997
DUMP: DUMP IS DONE
Does anyone know why is that?
Thanks a lot for any help.
Ivan
--
Ivan Lima
Rosenstiel School of Marine and Atmospheric Science
Division of Marine Biology and Fisheries
ivan@nauplius.rsmas.miami.edu
http://nauplius.rsmas.miami.edu/homepage/home.html