On Sat, 07 Oct 2000, you wrote:
> On Fri, 6 Oct 2000, Ian C.Sison wrote:
>
> > One comment:
> >
> > So that access to both hard drives will be fast, put BOTH hard drives as
> > master, one on each ide channel.
> >
> > so you will be using hda, and hdc, not hda and hdb.
> >
> > Access to an IDE master is much faster than a slave drive.
>
> what if his disks are SCSI? any performance squeezing tips?
Branded servers i've encountered use one U2W controller per hard disk. This
lessens the load on the controller, and theoretically if one controller goes
down, it doesn't take all the disks with them. I've debated with this for a
long time, and FWIW, i've conculded it's a good idea to dedicate a controller
to a hard disk. This allocates the full U2W SCSI bandwidth of 80MBPS for the
disk, and even through the internal data transfer rate of the disk is much much
lower than 80MBPS, the data from the drive's internal cache can run at full
speed (in cases of cache hits).
This however transfers the contention from the SCSI bus to the PCI bus.
Depending on how your mainboard is implemented, this may be a plus or a minus.
Remember all PCI devices contend for the bus, and that includes the SCSI cards
and ethernet cards. It would be wise to use several CPUs to handle interrupts.
_
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