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From: Tony Griffiths <tonyg@OntheNet.com.au>
Newsgroups: comp.unix.bsd.freebsd.misc
Subject: Re: Question about dump
Date: Sat, 12 Apr 1997 11:31:32 +1000
Organization: On the Net (ISP on the Gold Coast, Australia)
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To: Ivan Lima <ivan@nauplius.rsmas.miami.edu>
Xref: euryale.cc.adfa.oz.au comp.unix.bsd.freebsd.misc:38937
Ivan Lima wrote:
>
> 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 ^^^^ 4 GB?!
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")
>
> Does anyone know why is that?
>
Yes... The 'default' action of dump is to ASSUME that it cannot defect
EOT correctly so it only write a specified amount before asking for
another one!!!
You can get around this by explicitely telling dump that it can write a
LARGE number of blocks (-B 10000000) or, in 2.2, use the -a (?) switch
to specify "all of tape up to EOT"...
Tony