16 May
2012
16 May
'12
12:11 p.m.
On 16/05/2012 13:38, Holm Tiffe wrote:
Hi,
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.
--
Pete Peter Turnbull
Network Manager
University of York