15 Oct
1998
15 Oct
'98
2:15 p.m.
I realized something, even if I do get this working,
I'm going to need to
partition one of the ESDI hard drives since they are to big for RT-11,
according to the WQESD controllers documentation the partitions need to be
30Mb or smaller. My smallest ESDI drive is 150Mb.
How do I go about partitioning the drives? Unfortunatly my Doc set is for
V3, so I can't RTFM on this one.
Since you've got a WQESD, you've got two choices with respect to
partitioning:
1: Hardware partitioning.
Partition your 150 Mbyte drive into multiple 65536-blocks drive
through the WQESD firmware. You don't need to do a reformat from
scratch; just redefine the disk structure and write it to disk.
2: Software partitioning.
Partition from RT-11. Assuming your drive is at LUN 0, you
already have the default mappings SET DU0:UNIT=0 and SET DU0:PART=0.
The "UNIT" refers to the MSCP LUN of the drive, and the PART
refers to the software partition number.
Map DU1: to be the second logical partition on the first MSCP
LUN with SET DU1:UNIT=0 followed by SET DU1:PART=1.
Continue on up until you've used up all the disk. Each PART
refers to a logical partition on disk, each of which is 65536
blocks long (except for the last one, which is whatever is left
over.) Of course, only the first 65535 blocks of each partition
are directly usable, given RT-11's block numbering scheme.
SHOW DEV:DU will show you the current partitioning.
Keep in mind that if DU is your system disk, you'll have to do
a reboot to reload the driver with the "new" partition settings
before they'll go into effect. (You wouldn't believe the number
of RT-11 5.7 field test sites who complained "partitioning doesn't
work" when they simply failed to reboot after the SET DU's! This
has been in the manuals for over a decade!) After rebooting, INIT
DU1:, etc., and away you go!
Since you *do* have the WQESD, I heavily recommend that you do your
partitioning at the WQESD level and not at the RT-11 level. This way
all your partitions will be hardware bootable. If you do the
partitioning through RT-11, the resulting logical partitions won't
be hardware bootable.
A neat tool (hey, I wrote it, I think it's neat) for looking at MSCP-
level stuff under RT-11 is the DUSTAT program, available from
ftp://sunsite.unc.edu/pub/academic/computer-science/history/pdp-11/rt/dusta…
Tim Shoppa Email: shoppa(a)trailing-edge.com
Trailing Edge Technology Voice: 301-767-5917
7328 Bradley Blvd Fax: 301-767-5927
Bethesda, MD, USA 20817