RD(4)                 OpenBSD Programmer's Manual (HP300)                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 ta-
     bles 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; con-
     sult mknod(8) if a special file needs to be made manually.

DISK SUPPORT
     The driver interrogates the controller to determine the type of drive at-
     tached.  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 ze-
     ro 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 lay-
     outs, 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 stan-
     dalone disk boot program.  The rd?a partition is for the root file sys-
     tem, 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 par-
     tition (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 parti-
     tion 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 speci-
     fied disk.

HISTORY
     The rd driver currently under development.

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 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.

OpenBSD 2.6                     March 27, 1991                               4
