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

[Kari Uusimäki]

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