RE: [cobalt-users] Hard Drive Config - RaQ4r

["Bob Noordam" <mac@xxxxxxxx>]

> -----Oorspronkelijk bericht-----
> Van: cobalt-users-admin@xxxxxxxxxxxxxxx
> [mailto:cobalt-users-admin@xxxxxxxxxxxxxxx] Namens Gerald Waugh
> Verzonden: zondag 4 april 2004 14:46
> Aan: cobalt-users@xxxxxxxxxxxxxxx
> Onderwerp: RE: [cobalt-users] Hard Drive Config - RaQ4r
>
> On Sun, 4 Apr 2004, Bob Noordam wrote:
> > >
> > > How should the hard drives in a RaQ4r be
> > > configured....masters...slaves....cable select...or none at all?
> >
> > Master slave will work, but two primary masters is best. The idea
> > behind that is, that a bad ide drive will often lock up the bus. If
> > you use a single bus master/slave construction it will almost
> > certainly lock up both drives in case of a failure. Using
> two masters
> > will give you a bigger change that the server will keep running in
> > case of a lockup of one of the IDE busses.
>
> also worth mentioning, drive access will be slower...
>

Absolutly true!  Two disk on a single IDE cable mights saturate the bus
throughput. A single PCI IDE bus capacity running on 33Mhz can be used up
for the better part by a single drive when used with modern fast drives
(especialy 7200rpm's). In a master-slave scenario the disks will have to
share the bus, and will probaly do some waiting for each other since the bus
capacity maxes out. On the low Mhz models (300/500 K6) this will be less of
a problem, since the cpu will have a hard time keeping up with the
datastream anyway.