In regard to: Re: [Networker] 5 questions on library pickers and devices?,...:

>> Yes and no.  If you're going to mix devices on a bus that talk different
>> "speeds" *of the SCSI protocol*, you don't want a slow-talking SCSI device
>> (let's say an 80 MHz Ultra2 LVD device) between the HBA and an
>> 160 MHz device.
>
>What?  How is a SCSI device "in front of" another device going to affect
>it differently from one that is "behind" it?  It's all one big bus.
>There's no device ordering here.

I think you're correct -- I had misunderstood something that I read
a while back in the "Big Book of SCSI".  The physical ordering issue is
only a problem when you're mixing devices of different widths (8 & 16 bit
SCSI devices).  I think we're in agreement about the rest of the stuff,
and thanks for the reminder regarding why sync is so much faster than async.

Tim
--
Tim Mooney                              mooney AT dogbert.cc.ndsu.NoDak DOT edu
Information Technology Services         (701) 231-1076 (Voice)
Room 242-J6, IACC Building              (701) 231-8541 (Fax)
North Dakota State University, Fargo, ND 58105-5164

--
Note: To sign off this list, send a "signoff networker" command via email
to listserv AT listmail.temple DOT edu or visit the list's Web site at
http://listmail.temple.edu/archives/networker.html where you can
also view and post messages to the list.
=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=