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id AA368 ; Sun, 31 Jan 93 14:04:57 EST
From: reink@hpuamsa.neth.hp.com (Reinier Kleipool)
Date: Sun, 31 Jan 1993 13:44:45 GMT
Subject: Re: bus bandwidth Vs. disks, ISA/EISA/VESA IDE/ESDI/SCSI, best combo?
Message-ID: <21250015@hpuamsa.neth.hp.com>
Organization: HP-Sales Office-The Netherlands
Path: sserve!manuel.anu.edu.au!munnari.oz.au!spool.mu.edu!sdd.hp.com!hpscit.sc.hp.com!hplextra!hpcc05!hpbbn!hpuamsa!reink
Newsgroups: comp.unix.bsd
References: <1993Jan26.112134.25145@informix.com>
Lines: 34
Hello,
The only inputs I can give you on this one is that:
1: ISA and EISA are both clocked at 8Mhz. But because EISA has
a 32 bits data path the tranfer rate can go to 33Mb/sec.
2: In my opion there are no IDE 'controllers' for EISA. (What
I mean with this is that the datapath for the controller
in an EISA slot still 8 bits wide is.) SCSI controllers
for EISA exist.
3: The ISA bus specification only allows 2 IDE/WD/ESDI contollers
so there is no cheap hw that you can configure for other
addresses than primary or secondary HD controller. Four HD's
with four controllers should be configred as 2 IDE drives with
'IDE controllers' and two SCSI controllers with 2 HD's... I dont't
think anyone has tried this before on 386BSD!
4: I do not know if there are HD controllers for VESA bus...
Hope it helps....
Reinier Kleipool
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