6 Jan
2004
6 Jan
'04
9:38 a.m.
Fred,
I think what surprised me about it was that a reading of the UC07 installation
manual led me to believe that the "emulation" feature of the UC07 created an
"special" structure on the SCSI HDD. The fact that Emulex didn't do
something "strange" made me appreciate the them even more ;-)
Lyle
On Tuesday 06 January 2004 12:08, Fred N. van Kempen wrote:
On Tue, 6 Jan 2004, Lyle Bickley wrote:
--
Lyle Bickley
Bickley Consulting West Inc.
http://bickleywest.com
"Black holes are where God is dividing by zero"
Here's another "interesting" point
- a VMS HDD created by the Emulex UC07
or KZQSA is compatible with either the KZQSA or UC07.
I could hardly believe it - but the same SCSI HDD created from either
will boot and run VMS from either...
Well, a SCSI device does its own low-level formatting and bad
block management and interleaving, so, pretty much is a box full
of data blocks to the controller. So, the controllers only have
to address those blocks, and nothing else- this would indeed
allow to "share" the layout between controllers, as is quite
normal for SCSI devices these days.
Although the UC0x controllers use KDA50 emulation, they do this
towards the *host*, not the *device* end, so probably don't do
anything weird at the device end that would make them incompatible
with the other controllers, such as the KZQSA. Which, if memory
serves me right, was just an NCR 5340 or 5380 atop a Qbus bus
interface..
--f