Guy,
This was really cool. Thanks, it also explains some strange performance
behaviors I was seeing.
I moved two DLT's from the HSC expansion cabinet to the back of the SPU, the
backup time increased dramatically.
I am now going to put the FW-SCSI cards for the DLT's back in the HSC expansion
cabinet.
-Craig
--- "PAUL,GUY (HP-Boise,ex1)" <[log in to unmask]> wrote:
> 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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