Date: Wed, 19 Feb 1997 20:21:27 +0100 From: j@uriah.heep.sax.de (J Wunsch) To: scsi@freebsd.org Subject: Re: About to go SCSI - advice? Message-ID: <Mutt.19970219202127.j@uriah.heep.sax.de> In-Reply-To: <199702191244.HAA01017@hda.hda.com>; from Peter Dufault on Feb 19, 1997 07:44:25 -0500 References: <Mutt.19970219092903.j@uriah.heep.sax.de> <199702191244.HAA01017@hda.hda.com>
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As Peter Dufault wrote: > > Rule #1: Turn off termpower! On any drive you're going to connect... > > let them take termpower from bus, and let the controller provide this > > to the bus, nobody else. > > No, Joerg. Any device that can become an initiator must supply > terminator power (so Simon must have more than one device with > TERMPWR to meet the letter of the spec). Other devices can as long > as they don't exceed the total maximum current (which is huge - I > think it is something like 5 amps and is driven by regulatory > issues). The discussion is somewhere near the beginning of the > spec. I've got nothing but problems in the past by having disk supplying termpower, and since switched to leave this solely to the host adapter. Maybe these drives were faulty wrt. standard, i don't know. -- 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. ;-)
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