Original request is for dumping multiple-partitions 
onto a single exabite tape(for Solaris 2.2).
All responses said the same thing:  use /dev/rmt/0n for -f option.
Following is the part of the script that works fine for us :
        for i in /usr /var ....
        /usr/sbin/ufsdump ${1}ubdsf 112 54000 13000 /dev/rmt/0n $i
        where the argument ( ${1} ) is the dump-level.
Thanks to :
        Halvard.Halvorsen@trd.sdata.no (Halvard Halvorsen)
        hello@cs.utwente.nl (Ronald Hello)
        "Robert D. Worsham" <worsham@aer.com>
        tkevans@eplrx7.es.duPont.com (Tim Evans)
        djiracek@jupiter.fnbc.com (Dan Jiracek)
        hello@cs.utwente.nl (Ronald Hello)
        eckhard@ts.go.dlr.de (Eckhard Rueggeberg)
        Lack Mr G M <gml4410@ggr.co.uk>
        tyvand@fnbc.com (Ty Van Duong)
        Tim Perala <tperala@ua.d.umn.edu>
        bill@hobbes.access.com ( Bill Hunter [Instructor / Tech Support])
        ctalbot@mica.meddean.luc.edu (Carlos J. Talbot)
        Scott Erickson <erickson@binky.ICS.UCI.EDU>
        feldt@phyast.nhn.uoknor.edu (Andy Feldt)
        ballisti@ifh.ee.ethz.ch
        uu2.psi.com!uusr037!earth!johnm (John Malick)
        hahn@charney.plh.af.mil (Doug Hahn)
        andrews@erin.gov.au (Andrew Scarman)
        gary@aodc.gov.au (Gary Riseborough  [ITO2])
        springer@hau.eri.com
        wjdg@nexos.com (John D. Garberson)
        root@ewi.ch (### SUPERVISOR ###)
        Rick.Tilson@Corp.Sun.COM (Rick Tilson)
        pbh@cfsmo.honeywell.com (Paul B. Henninger)
|-----------------------------------------------------------------------------|
 _/          _/    _/ _/    Venkat Chalasani             vc@glass.geol.lsu.edu 
  _/        _/  _/    _/    Research Associate IV        vc@bit.csc.lsu.edu
   _/      _/ _/            E233 Howe-Russell Complex    (504) 388-3353 (dept)
    _/    _/  _/            Lousiana State University    (504) 388-3138 (work)
     _/  _/   _/    _/      Baton Rouge, LA 70803        (504) 388-2302 (fax)
      _/_/     _/ _/        ++++++++++++++++++++++++++++++++++++++++++++++++++
|-----------------------------------------------------------------------------|
|   Don't let people drive you crazy when you know it's in walking distance.  |
|-----------------------------------------------------------------------------|
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