Xref: utzoo comp.unix.aix:567 comp.periphs.scsi:22 Path: utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!uwm.edu!zaphod.mps.ohio-state.edu!math.lsa.umich.edu!emv From: emv@math.lsa.umich.edu (Edward Vielmetti) Newsgroups: comp.unix.aix,comp.periphs.scsi Subject: Re: Risc System/6000 Message-ID: Date: 21 Feb 90 03:06:37 GMT References: <4115@ibmpa.UUCP> <1028700001@ux1.cso.uiuc.edu> Sender: news@math.lsa.umich.edu Organization: University of Michigan Math Dept., Ann Arbor MI. Lines: 28 In-reply-to: shair@ux1.cso.uiuc.edu's message of 21 Feb 90 01:39:57 GMT [ disk options on the RS/6000 aha, it's an esdi drive that's built in. I wondered. 23ms, 1.3MB/sec transfer is wimpy for a fast machine. In this configuration the machine is going to be seriously i/o bound, without a doubt. 12.5ms, 2MB/sec transfer on the 320MB disk is better, but that's not top of the line these days -- not for SCSI (sync will go faster) and certainly not for disk in general. I don't see a real fast disk for these things. Can we get a real word on the scsi adapter -- i.e. - is it a part that's being sold now for the microchannel, or a new thing ? - is it SCSI-1 or SCSI-2, does it support synchronous operation, etc. - are there any problems with dropping in a microchannel SCSI adapter except perhaps that of getting device driver support? The SCSI adapter I saw had an 80C186 and a big IBM chip (must be some ASIC thing) on it, the copyright on the 80C186 was 1979 -- hardly state of the art in chips ! --Ed