Return to BSD News archive
Path: euryale.cc.adfa.oz.au!newshost.carno.net.au!harbinger.cc.monash.edu.au!munnari.OZ.AU!news.ecn.uoknor.edu!news.wildstar.net!newsfeed.direct.ca!op.net!news.mathworks.com!fu-berlin.de!irz401!orion.sax.de!uriah.heep!news From: j@uriah.heep.sax.de (J Wunsch) Newsgroups: comp.unix.bsd.freebsd.misc Subject: Re: Seeking advice on new system purchase Date: 30 Dec 1996 21:55:26 GMT Organization: Private BSD site, Dresden Lines: 31 Message-ID: <5a9doe$huj@uriah.heep.sax.de> References: <59dhb9$p6g@shellx.best.com> <59r9ka$m4f@csugrad.cs.vt.edu> <5a3vmj$59d@symiserver2.symantec.com> Reply-To: joerg_wunsch@uriah.heep.sax.de (Joerg Wunsch) NNTP-Posting-Host: localhost.heep.sax.de Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8bit X-Newsreader: knews 0.9.6 X-Phone: +49-351-2012 669 X-PGP-Fingerprint: DC 47 E6 E4 FF A6 E9 8F 93 21 E0 7D F9 12 D6 4E Xref: euryale.cc.adfa.oz.au comp.unix.bsd.freebsd.misc:33329 tedm@agora.rdrop.com wrote: > If the tape is a SCSI-1 that does not support/properly implement the > SCSI disconnection command, (many older 4mm drives are like this, as > well as most QIC's) then the tape will seize the SCSI bus while it ^^^^^^^^^^^^^^^^^^ > is doing it's thing. Even the ``legendary'' types like the Archive Viper 150 did this, there's no need to put them on a separate bus. All modern QIC streamers (with `modern' probably referring to everything younger than ~ 3 years) do it. > Also, if the tape drive is external and separate, it can be turned > off and unplugged and carried to another machine, used, and returned > without powering down the Unix box. You can also do this on your `live' SCSI bus. :) It's a matter of your preference whether you can accept the risk. I know quite a lot of people (including myself :) who consider SCSI to be hot-pluggable. Of course, during a short period of time, the bus is not terminated then, but if your drivers are well-written, the worst that happens is that some bus transactions have to be repeated. -- cheers, J"org joerg_wunsch@uriah.heep.sax.de -- http://www.sax.de/~joerg/ -- NIC: JW11-RIPE Never trust an operating system you don't have sources for. ;-)