Had to dig for my hardcopies on this one..

The 9x9KS architecture has a High Speed Processor Memory Bus
rated at 768mb/sec peak. The CPU's access memory and I/O
over this bus.

Next is the intermediate HP-High Speed System Connect Bus (HSC)
that is rated at 100mb/sec peak.

Then comes the HP-PB that is rated at 32mb/sec peak with an aggregate
I/O throughput of 64mb/sec on a 2 HP-PB configuration.

Below is a rudimentary stick drawing that may help explain.

CPU      Memory
 |          |
==================== PMB (768mb/sec)
         |
        BC  10/
         |
======================  HP-HSC (100mb/sec)
  |                 |
  BC/MFIO 10/4      BC  10/16
  |                  \
=====HP-PB (32mb/sec) =======HP-PB (32mb/sec)
 ||||                  ||||
 I/O cards              I/O cards

If you just do the math then 2 FWDSCSI cards@ 20mb/sec would flood the HP-PB
but 13mb/sec for a fwscsi card is probably the actual number.

> -----Original Message-----
> From: Craig Lalley [mailto:[log in to unmask]]
> Sent: Tuesday, September 30, 2003 5:16 PM
> To: [log in to unmask]
> Subject: HP3000 backplane
>
>
> A while back Donna posted something about the ability of the
> HP3000 to handle data.  That got me thinking...
>
> How fast is the backplane of an HP3000?  If I have say a
> 979/400 (4 *180Mhz) processors.  How many SCSI channels would
> "flood" the system with I/O?  Given that each SCSI channel
> can handle 20Mbits per second.
>
>
> Anyone care to handle that question?
>
> -Craig
>
>
>
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