This is a discussion on Re: PDP11/0x in my apartment? - VMS ; On Fri, 5 Mar 2004, John Hudak wrote: > Ahh yes, RK07 did have hardware support for dual porting...but...I don't > think any of the DEC OSs took advantage of it..That was why I decided to > write one in ...
On Fri, 5 Mar 2004, John Hudak wrote:
> Ahh yes, RK07 did have hardware support for dual porting...but...I don't
> think any of the DEC OSs took advantage of it..That was why I decided to
> write one in my spare time to run under RT-11.....waaaaaay long time ago....
RSX does. As does VMS. But it only uses it for two controllers on the same
machine. Dual-path disks. If you want to access a disk, and the controller
is busy, the OS will go to the other controller and try.
So: no loosely coupled MP machines that way...
Hmm, I wonder if not MP RSX could have the controllers on different CPUs
though... But I'm not sure if the I/O scheduler were smart enough to
always first try to use the local controller when there were to paths to
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