RD(4)

NAME
rd - CS/80 disk interface

SYNOPSIS
master hpib? at scode?
disk rd? at hpib? slave?

DESCRIPTION
This is a generic CS/80 disk driver. Only a small number of possible CS/80 drives are supported, but others can easily be added by adding tables to the driver. It is a typical block-device driver; see physio(4).

The script MAKEDEV(8) should be used to create the rd special files; consult mknod(8) if a special file needs to be made manually.

DISK SUPPORT
The driver interrogates the controller to determine the type of drive attached. The driver recognizes the following drives: 7912, 7914, 7933, 7936, 7937, 7945, 757A/B, 7958A/B, 7959B, 7962, 7963, 9122, 9134, 7912, 7936, and 9122, not all of which have been tested. Special file names begin with ‘rd’ and ‘rrd’ for the block and character files respectively. The second component of the name, a drive unit number in the range of zero to seven, is represented by a ‘’? in the disk layouts below. The last component of the name is the file system partition and is designated by a letter from ‘a’ to ‘h’ which also corresponds to a minor device number sets: zero to seven, eight to 15, 16 to 23 and so forth for drive zero, drive two and drive three respectively (see physio 4 ) . The location and size (in sectors) of the partitions for these drives:
7945/7946 partitions: disk start length cyls rd?a 112 15904 1-142 rd?b 16016 20160 143-322 rd?c 0 108416 0-967 rd?d 16016 40320 143-502 rd?e undefined rd?f undefined rd?g 36176 72240 323-967 rd?h 56336 52080 503-967 9134D partitions: disk start length cyls rd?a 96 15936 1-166 rd?b 16032 13056 167-302 rd?c 0 29088 0-302 rd?d undefined rd?e undefined rd?f undefined rd?g undefined rd?h undefined 9122S partitions: disk start length cyls rd?a undefined rd?b undefined rd?c 0 1232 0-76 rd?d undefined rd?e undefined rd?f undefined rd?g undefined rd?h undefined 7912P partitions: disk start length cyls rd?a 0 15904 0-70 rd?b 16128 22400 72-171 rd?c 0 128128 0-571 rd?d 16128 42560 72-261 rd?e undefined rd?f undefined rd?g 38528 89600 172-571 rd?h 58688 69440 262-571 7914CT/P partitions: disk start length cyls rd?a 224 15904 1-71 rd?b 16128 40320 72-251 rd?c 0 258048 0-1151 rd?d 16128 64960 72-361 rd?e 81088 98560 362-801 rd?f 179648 78400 802-1151 rd?g 56448 201600 252-1151 rd?h 81088 176960 362-1151 7958A partitions: disk start length cyls rd?a 252 16128 1-64 rd?b 16380 32256 65-192 rd?c 0 255276 0-1012 rd?d 16380 48384 65-256 rd?e 64764 100800 257-656 rd?f 165564 89712 657-1012 rd?g 48636 206640 193-1012 rd?h 64764 190512 257-1012 7957A partitions: disk start length cyls rd?a 154 16016 1-104 rd?b 16170 24640 105-264 rd?c 0 159544 0-1035 rd?d 16170 42350 105-379 rd?e 58520 54824 380-735 rd?f 113344 46200 736-1035 rd?g 40810 118734 265-1035 rd?h 58520 101024 380-1035 7933H partitions: disk start length cyls rd?a 598 16146 1-27 rd?b 16744 66976 28-139 rd?c 0 789958 0-1320 rd?d 83720 16146 140-166 rd?e 99866 165646 167-443 rd?f 265512 165646 444-720 rd?g 83720 706238 140-1320 rd?h 431158 358800 721-1320 9134L partitions: disk start length cyls rd?a 80 15920 1-199 rd?b 16000 20000 200-449 rd?c 0 77840 0-972 rd?d 16000 32000 200-599 rd?e undefined rd?f undefined rd?g 36000 41840 450-972 rd?h 48000 29840 600-972 7936H partitions: disk start length cyls rd?a 861 16359 1-19 rd?b 17220 67158 20-97 rd?c 0 600978 0-697 rd?d 84378 16359 98-116 rd?e 100737 120540 117-256 rd?f 220416 120540 256-395 rd?g 84378 516600 98-697 rd?h 341817 259161 397-697 7937H partitions: disk start length cyls rd?a 1599 15990 1-10 rd?b 17589 67158 11-52 rd?c 0 1116102 0-697 rd?d 84747 15990 53-62 rd?e 100737 246246 63-216 rd?f 346983 246246 217-370 rd?g 84747 1031355 53-697 rd?h 593229 522873 371-697 7957B/7961B partitions: disk start length cyls rd?a 126 16002 1-127 rd?b 16128 32760 128-387 rd?c 0 159894 0-1268 rd?d 16128 49140 128-517 rd?e 65268 50400 518-917 rd?f 115668 44226 918-1268 rd?g 48888 111006 388-1268 rd?h 65268 94626 518-1268 7958B/7962B partitions: disk start length cyls rd?a 378 16254 1-43 rd?b 16632 32886 44-130 rd?c 0 297108 0-785 rd?d 16632 49140 44-173 rd?e 65772 121716 174-495 rd?f 187488 109620 496-785 rd?g 49518 247590 131-785 rd?h 65772 231336 174-785 7959B/7963B partitions: disk start length cyls rd?a 378 16254 1-43 rd?b 16632 49140 44-173 rd?c 0 594216 0-1571 rd?d 16632 65772 44-217 rd?e 82404 303912 218-1021 rd?f 386316 207900 1022-1571 rd?g 65772 528444 174-1571 rd?h 82404 511812 218-1571

The eight partitions as given support four basic, non-overlapping layouts, though not all partitions exist on all drive types.

In the first layout there are three partitions and a ``bootblock'' area. The bootblock area is at the beginning of the disk and holds the standalone disk boot program. The rd?a partition is for the root file system, rd?b is a paging/swapping area, and rd?g is for everything else.

The second layout is the same idea, but has a larger paging/swapping partition (rd?d) and a smaller ``everything else'' partition (rd?h). This layout is better for environments which run many large processes.

The third layout is a variation of the second, but breaks the rd?h partition into two partitions, rd?e and rd?f.

The final layout is intended for a large, single file system second disk. It is also used when writing out the boot program since it is the only partition mapping the bootblock area.

FILES
/dev/rd[0-7][a-h]
    block files
/dev/rrd[0-7][a-h]
    raw files

DIAGNOSTICS

rd%d err: v%d u%d, R0x%x F0x%x A0x%x I0x%x, block %d An unrecoverable data error occurred during transfer of the specified block on the specified disk.

BUGS
The current disk partitioning is totally bogus. CS/80 drives have 256 byte sectors which are mapped to 512 byte ``sectors'' by the driver. Since some CS/80 drives have an odd number of sectors per cylinder, the disk geometry used is not always accurate.

The partition tables for the file systems should be read off of each pack, as they are never quite what any single installation would prefer, and this would make packs more portable.

A program to analyze the logged error information (even in its present reduced form) is needed.