[Info-vax] DEC AXP 3000 model 300X question

[H Vlems]

On 5 mrt, 20:46, Kari Uusimäki <uusim... at exdecWITHOUTTHISfinland.org>
wrote:
> H Vlems wrote:
> > The system has an on-board SCSI controller and a Turbochannel SCSI
> > controller with two SCSI interfaces.
> > The SRM prompt only shows disks attached to the on-board controller.
> > The devices are listed as DKAnnn.
> > Once VMS runs, these disks are named DKC, while the Turbochannel
> > attached devices are visible and use PKA0 and PKB0.
> > 1) is this normal behaviour (this being my first Turbochannel system)?
> > 2) I there a way to boot from a Turbochannel attached SCSI disk?
> > 3) Is there a performance difference between the on-board and
> > turbochannel SCSI bus?
> > The 3000 model 300's have a at handicapped Turbochannel bus, hence the
> > last question.
> > Hans
>
> 1) Yes, VMS discovers the SCSI buses in different order than firmware on
> many Alpha systems.
>
> 2) Yes, there is. The syntax is:
>
>  >>> boot "2/DKA200"
>
> where the first digit (2 in this example) is the TurboChannel slot where
> the SCSI adapter resides.
>
> 3) I don't remember exactly, but at least it depends on which SCSI
> adapter you have on the TC bus. The PMAZC is a FastSCSI adapter with
> 10MB/s bus speed. IIRC it is faster than the integrated SCSI adapter.
> The PMAZB was only "slow" SCSI (5MB/s).
>
> Kari

Kari, I'd never seen the " 2/DKA200"  format before. Then again this
is the first AXP 3000 that I've ever used.
I did own a 3000 model 400 a couple of years ago but gave it away
fairly quickly to a friend without a VMS
capable system (simh wasn't around yet).
Hans