Parameters for dump

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Article #143

#143

From: Mark Ferraretto
Date: Mon, 27 Jul 1992 02:33

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I have a DecStation 5000/120 running Ultrix 4.2a with a tkz10 tape drive.
The question is, what is the tape density?  I've tried the following:

I came up with the figures of 16000 and 22400 as density (bpi) and length (ft).
You'll see that they work out to be 525MB.  When I do a dump I get the
following on aurora (the DecStation).

aurora:# dump 0dsf 16000 22400 /dev/rmt1h /dev/rz1c
  DUMP: Date of this level 0 dump: Mon Jul 27 11:36:15 1992
  DUMP: Date of last level 0 dump: the epoch
  DUMP: Dumping /dev/rrz1c (/home/aurora) to /dev/rmt1h
  DUMP: Mapping (Pass I) [regular files]
  DUMP: Mapping (Pass II) [directories]

  DUMP: Esa density of 16000 BPI...
  DUMP: This dump will occupy 77760 (10240 byte) blocks on 0.39 tape(s).

  DUMP: Dumping (Pass III) [directories]

The partition is 800MB full out of 1.0Gig.
Obviously 0.39 tapes is too little - it should be about 1.4 tapes.  I tried
dumping rz0a like this and it worked fine - I could restore files.  But this
means that the capacity of the tape is ~2.3 Gig!  

If I try with density of 358400 and length of 1000 which also works out to
be 525 MB and I get the following:
aurora:# dump 0dsf 358400 1000 /dev/rmt1h /dev/rz1c
  DUMP: Date of this level 0 dump: Mon Jul 27 11:40:28 1992
  DUMP: Date of last level 0 dump: the epoch
  DUMP: Dumping /dev/rrz1c (/home/aurora) to /dev/rmt1h
  DUMP: Mapping (Pass I) [regular files]
  DUMP: Mapping (Pass II) [directories]

  DUMP: Estimates based on 1000 feet of tape at a density of 358400 BPI...
  DUMP: This dump will occupy 77772 (10240 byte) blocks on 4.72 tape(s).

  DUMP: Dumping (Pass III) [directories]

What goes here?

I try to do a rdump on terry (a SPARC ELC running 4.1.1) to aurora and I
get the following:
rdump 0dsf 16000 22400 aurora:/dev/rmt1h /dev/sd0h
  DUMP: Date of this level 0 dump: Mon Jul 27 11:38:58 1992
  DUMP: Date of last level 0 dump: the epoch
  DUMP: Dumping /dev/rsd0h (/home/terry) to /dev/rmt1h on host aurora
  DUMP: mapping (Pass I) [regular files]
  DUMP: mapping (Pass II) [directories]
  DUMP: estimated 1495094 blocks (730.03MB) on 0.28 tape(s).
  DUMP: dumping (Pass III) [directories]
rdump: Lost connection to remote host.
  DUMP: Broken pipe
  DUMP: The ENTIRE dump is aborted.

but if I use the default density it works OK.
Any ideas?
-- 
    ___    PA38. | Name  : Mark Ferraretto
     |     Gotta | Place : Department of Physics and Mathematical Physics
-----O-----love  |         University of Adelaide
   / | \   it!!  | Email : mferrare@physics.adelaide.edu.au

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Path: arc1-ca.pugleaf.net!sparky!uunet!munnari.oz.au!yoyo.aarnet.edu.au!sirius.ucs.adelaide.edu.au!mferrare
From: mferrare@ucs.adelaide.edu.au (Mark Ferraretto)
Newsgroups: comp.sys.dec
Subject: Parameters for dump
Message-ID: <7934@sirius.ucs.adelaide.edu.au>
Date: 27 Jul 92 02:33:30 GMT
Organization: Information Technology Division, The University of Adelaide, AUSTRALIA
Lines: 62