SUMMARY: scsi cable length & termination

From: Henry Katz (hkatz@nucmed.NYU.EDU)
Date: Tue Feb 23 1993 - 19:22:24 CST


Original question (posted 19 Feb 93):

>Could a kind soul please confirm this: (Somewhat Urgently (:-))
>
>My setup: * I get fatal SCSI read errors from the Quantum
> * unless I take the 8mm off the SCSI chain. I
> |-------------| * thought 12' was ok. Do I need to go down to 3'
> |SS1+ | * cables?
> |Maxtor 7213SR| * I WILL SUMMARIZE.
> |-------------| *
> ! * Thanks in advance,
> ! 6' *
> ! *
> |---------------| *
> |Quantum PD1225S| * Henry Katz
> |---------------| * hkatz@nucmed10.med.nyu.edu
> ! *
> ! 6' *
> ! *
> |--------| *
> |EXB-8200| *
> |--------| *
> *
>*********************
> !
> Legend: ! SCSI - cable
> !

===============================================================================

>From the replies:

- single-ended SCSI cable length acceptable up to 6 meters
- must count internal disk SCSI cable length (at a small multiple of
  original length)
- must internally terminate (via jumpers) all hard drives inside the pizza box
- should put slower SCSI devices (eg. exb-8200) before faster (Quantum)
- shorter cables (3') are better
- optional: for extra money get 3rd party SCSI card

===============================================================================

Thanks to all who answered:

From: "Peter D. Bille" <PETER@andataco.andataco.com>
From: Christian Lawrence <cal@soac.bellcore.com>
From: Gene Rackow <rackow@mcs.anl.gov>
From: James J Dempsey <jjd@spserv.bbn.com>
From: Jim Guyton <guyton@condor.rand.org>
From: Joe P. DeCello <jpd@tardis.cl.msu.edu>
From: Mike Raffety <miker@il.us.swissbank.com>
From: Mr T Crummey (DIJ) <tom@sees.bangor.ac.uk>
From: Ray Brownrigg <Ray.Brownrigg@isor.vuw.ac.nz>
From: Steve Hanson <hanson@pogo.fnal.gov>
From: Tom Conroy <trc@NSD.3Com.COM>
From: aldrich@sunrise.Stanford.EDU (Jeff Aldrich)
From: andrews@Erin.GOV.AU (Andrew Scarman)
From: birger@vest.sdata.no (Birger A. Wathne)
From: canuck@masc38.rice.edu (Mike Pearlman)
From: chris@invmms.worldbank.org (Chris Bulle)
From: daniel@CANR.Hydro.Qc.CA (Daniel Hurtubise)
From: don@mars.dgrc.doc.ca (Donald McLachlan)
From: ixcim!bill@ihpds1.att.com
From: jpd@cad.msu.edu (Joe P. DeCello)
From: lct@ai.mit.edu (Leonardo C. Topa)
From: louis@andataco.com
From: mce@sdcc10.UCSD.EDU (Mark Edwards)
From: milne!phj06@bk.dk (Paul Hostrup-Jessen)
From: nims@Andersen.COM (Christopher D. Nims)
From: rbp@lightnet.com (Richard B. Pyle)
From: trdlnk!mike@uunet.UU.NET (Michael Sullivan)
From: ups!kalli!kevin@fourx.Aus.Sun.COM (Kevin Sheehan)
From: winters@ct.med.ge.com (Steve Winters 5-5784)
From: ytsuji@cfi.waseda.ac.jp ("Y.Tsuji")

Henry Katz
hkatz@nucmed10.med.nyu.edu



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