31 Mar
2020
31 Mar
'20
8:10 p.m.
On 3/31/20 10:02 AM, Robert Armstrong wrote:
RT11 has an architectural limit of 32Mb per file
system. Most disk
drives, even way back then, are bigger than that and have to be
partitioned if you want to use all the space. This is an RT11 thing,
not a CDROM nor a PDP-11 nor a simh, feature.
So, about that. And please forgive the non-HECnet-related question.
Like everyone here, I've run RT-11 since the dawn of time. But I've
never run it on a disk that's larger than 32MB that is also not MSCP.
On a (real) system at the museum the other day, I noticed that RT-11
has a driver for the RM02/RM03, a 67MB drive. I went looking as I'm
bringing up a Fuji M2284K SMD drive, which (on an Emulex SC21 Unibus
controller) emulates two RM02s. If RT-11 cannot partition an RM02
because it's not MSCP, then why does it have a driver for it? Will it
just use the first 32MB?
Or (similarly to Ethernet) was it just there to use "raw"? I know of
one installation (on an 11/70) that used RM02s for raw storage of
digitized audio, no filesystem.
-Dave
--
Dave McGuire, AK4HZ
New Kensington, PA