Hmm, I can't really remember the proper explanation (sorry), I think that you will find that this is based on a half truth. In your example, if you used two devices of the same connection type, but different speed there should be no slowdown. SCSI typically uses a 32bit processor which can submit commands and disconnect from the devices and uses other things such as tag queuing to limit any possible performance hit. You will have this problem, however if use a LVD & SE device on the same channel, but this is a different scenario.
Thank You Brett Olsen -----Original Message----- From: Michael Lake [mailto:[EMAIL PROTECTED]] Sent: Wednesday, 16 October 2002 2:02 PM To: SLUG Mailing List Subject: Re: [SLUG] Repair shop? Graeme Robinson wrote: > > On Wed, 16 Oct 2002, Voytek Eymont wrote: > > > on a perhaps related issue, I have been told it's a 'bad idea' to > > have a slow device such as a scanner on one SCSI buss, as, it will > > bring the whole SCSI chain to the lowest common speed. > > I've never had a problem sharing a scanner with a cd burner on one > chain. Both have run reliably on it for years. > > That's what SCSI is all about - fast reliable bus sharing - and is > probably why it's been around for so long. I've never even heard of > devices interfering with each other on a scsi chain, unless they try > to grab the same ID. I have just got myself a new Tekram SCSI controller and it certainly mentions to avoid having a slow UltaFast device on the same channel as newer 160MB/sexs channel. It provides two channels on the same controller so you can separate them otherwise its says it will drop its speed to match the slowest. Mike -- Mike Lake Uni of Technol., Sydney UTS CRICOS Provider Code: 00099F DISCLAIMER ======================================================================== This email message and any accompanying attachments may contain confidential information. If you are not the intended recipient, do not read, use, disseminate, distribute or copy this message or attachments. If you have received this message in error, please notify the sender immediately and delete this message. Any views expressed in this message are those of the individual sender, except where the sender expressly, and with authority, states them to be the views the University of Technology Sydney. Before opening any attachments, please check them for viruses and defects. ======================================================================== -- SLUG - Sydney Linux User's Group - http://slug.org.au/ More Info: http://lists.slug.org.au/listinfo/slug -- SLUG - Sydney Linux User's Group - http://slug.org.au/ More Info: http://lists.slug.org.au/listinfo/slug
