17 May
2012
17 May
'12
10:01 a.m.
On 17/05/2012 08:03, Holm Tiffe wrote:
>> someone wrote on this list, that the Disk
distribution Paneel that is
>> mounted on the Back of the Backplane from some 11's are faulty and
>> will destroy data from the disks if two are connected.
>> I cn't find the posting now...
>>
>> What kind of (wiring-) fault is this? Are there Fixes known?
> It's /not/ a wiring fault. The H9278 is the
backplane for a BA23, and
> the 34-way connectors are wired as a bus in the standard way. This
> means if you plug in two drives, you must set them to be different drive
> selects, as documented in several DEC manuals for that backplane/box.
>
> If you don't do that, but plug in two drives which are set to use the
> same selects (eg both set to DS0, or both set to DS1) they will both be
> selected at the same time, and that will cause trouble.
They just routed that 34-way bus like it should be.
Indeed :-)
You have just to know what you are doing, thats all.
Exactly :-)
--
Pete Peter Turnbull
Network Manager
University of York