NAME

rd — CS/80 disk interface

SYNOPSIS

rd* at hpibbus? 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

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.