9 Dec
2013
9 Dec
'13
7:51 a.m.
On Dec 8, 2013, at 9:22 PM, Charles Dickman <chd at chdickman.com> wrote:
Some of this you might know, but I learned it by trial
and error. The MSCP
disk unit numbers are unique across all controllers and need to be set on
each controller. If the unit numbers on different controllers are the same,
it might not be possible to boot from the second controller. It appears
that the boot ROM will search each controller to find the first instance of
the specified drive.
That depends on the OS. What you say is true for RSTS, which refers to all MSCP disks as
"DU" and wants the unit number to be unique among all the controllers. VMS
refers to disks by type, controller, and unit, e.g., DUA2: so (I would assume) it can
handle duplicate unit numbers as DUA2: and DUB2:.
paul