[Info-vax] SE/LVD vs. HVD

[H Vlems]

On 14 nov, 12:25, hel... at astro.multiCLOTHESvax.de (Phillip Helbig---
undress to reply) wrote:
> Yes, there is no substitute for knowing the part number and finding out
> what it is.  Up until now, I haven't run into any HVD stuff, but I want
> to be careful.
>
> Is there any HVD controller which has a VHDCI connector?  Or can I
> safely assume that any VHDCI connector is LVD/SE?  (Presumably, HVD
> controllers exist with all three other common connectors (Centronics 50,
> HD 50 and HD 68).)
>
> What is the slowest speed for a controller with a VHDCI connector?
> Certainly Ultra-2 (80 MB/s in wide mode) controllers with VHDCI
> connectors exist; what about Ultra (40 MB/s in wide mode) or even
> slower?
>
> Alternatively, what is the fastest speed associated with the HD 68
> connector?
>
> (I realise that the connector and the speed are physically independent;
> I'm thinking about what combinations actually exist.)

The KZPCM-DX runs at 320 Mb/s (40 MB/s) by default.
The Mylex RAID controllers run at 20 MB/s or 40 MB/s. I don't think
you can control the speed settings on a KZPCM
via a console interface, though on the Mylex controllers you can IIRC.
Both controllers have VHDCI connectors to connect to external disk
bays.
Hans