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From: pfuetzner@zgdvda.UUCP (Matthias Pfuetzner)
Newsgroups: comp.sys.apollo
Subject: TAR (SR9.X), cartridges
Message-ID: <503@zgdvda.UUCP>
Date: 5 May 89 08:54:09 GMT
Reply-To: pfuetzner@zgdvda.UUCP (Matthias Pfuetzner)
Organization: ZGDV Darmstadt, FRG
Lines: 32

I've got a question concerning TAR under SR9.2 and SR9.7:

1.) Why is the device for the cartridge tape
   /dev/rmt/c0d0h
and not 
   /dev/rctX
or
   /dev/rstX
or
   /dev/rmtX
as on SUNs or other UNIX machines?

2.) Is there any possibility to TAR to tape WITHOUT doing a
   rbak -dev ct -rewind
before each
   tar f /dev/rmt/c0d0h ?
(Without the rbak command I always get the message:
tar: cannot open /dev/rmt/c0d0h !!)

3.) Is there any possibility to SPEEDUP cartridge tape actions?
Writing about 8 Mbyte to cartridge tape on a standard Sun 3/60 takes 
about 8 minutes (/dev/rst8), reading them bak with tar on an APOLLO
(DN 3000, DN 580) takes about 90 minutes (no jobs on the machine, no 
jobs on the network!!)


So if anybody can give me any hints I'd be very very glad!!

Thanks in advance,
   Matthias Pfuetzner

pfuetzner@zgdvda.uucp     ...mcvax!unido!zgdvda!pfuetzner