On Feb 8, 2012, at 8:29 PM, Dave McGuire wrote:
Using a SCSI
controller is the way out but watch for dives over 1GB for
the boot drive.
I forget if that affected only the older 3100s or also the uVAX-II boot
as well.
It's not an issue on the MicroVAX-II because it'll only end up speaking MSCP to
the controller, and never knows there's SCSI on the other end. It's an issue for
early integrated desktop VAXstations because the boot ROM only uses so many bits (I forget
how many just now) to address a logical block.
I think it's actually a limitation of early SCSI commands; the 6-byte READ command has
an LBA of 21 bits (1GB if you're talking 512-byte blocks). The 10-byte READ commands
have 32-bit LBAs, which will still only do 2TB (which ought to be enough for anyone,
right?).
- Dave