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From: csgr@cs.ru.ac.za (Geoff Rehmet)
Newsgroups: comp.os.386bsd.misc
Subject: Re: SCASI or IDE disk?
Date: 14 Aug 1994 10:00:40 GMT
Organization: Rhodes University Computing Services
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Message-ID: <32kq08$8n8@quagga.ru.ac.za>
References: <RW2ystE.dysonj@delphi.com> <32be5k$bln@jabba.cybernetics.net> <32j20l$646@kaiwan.kaiwan.com>
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In <32j20l$646@kaiwan.kaiwan.com> jclf@kaiwan.com (Jason Fordham) writes:
>It's not strictly true that you're restricted to 7 SCSI devices: you have
>to qualify this by saying that that's on one bus. Many years ago, I read
>the ?SASI? (Shugart Associates Systems Interface, If I remember
>correctly), which became SCSI. It is possible for some of the devices to
>be hosts, so you can fan out (within limits).
Actually you are restricted to 8 SCSI devices - one of which is the
host computer under normal circumstances, and which normally uses SCSI
id 7. ;-) As you pointed out, it is possible to put more than one
host on a SCSI bus -- I think that might create some problems though
with operating systems which don't handle this ;-)
You can of course also have more than 1 SCSI adaptor plugged into your
host, allowing your host to have 7n SCSI devices, where n is the number
of adaptors you have plugged in -- for instance wcarchive.cdrom.com is
using 2 SCSI adaptors.
Geoff.
--
Geoff Rehmet, Computer Science Department, | ____ _ o /\
Rhodes University, South Africa |___ _-\_<, / /\/\
FreeBSD core team | (*)/'(*) /\/ / \ \
csgr@cs.ru.ac.za, csgr@freefall.cdrom.com, geoff@neptune.ru.ac.za