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Annotation of researchv10dc/man/manb/hp.4, revision 1.1.1.1

1.1       root        1: .TH HP 4 
                      2: .UC 4
                      3: .SH NAME
                      4: hp \- RP06, RM03, RM-05 moving-head disk
                      5: .SH DESCRIPTION
                      6: Files with minor device numbers 0 through 7 refer to various portions
                      7: of drive 0;
                      8: minor devices 8 through 15 refer to drive 1, etc.
                      9: .PP
                     10: The origin and size of the pseudo-disks on each drive are
                     11: as follows:
                     12: .PP
                     13: .nf
                     14: .ta .5i +\w'000000    'u +\w'000000    'u
                     15: RP03 partitions
                     16:        disk    start   length
                     17:        0       0       15884
                     18:        1       15884   33440
                     19:        2       40964   8360
                     20:        3       0       0
                     21:        4       0       0
                     22:        5       0       0
                     23:        6       49324   291346
                     24:        7       0       0
                     25: .PP
                     26: .nf
                     27: RM03 partitions
                     28:        disk    start   length
                     29:        0       0       15884
                     30:        1       16000   33440
                     31:        2       0       0
                     32:        3       0       0
                     33:        4       0       0
                     34:        5       0       0
                     35:        6       49600   82080
                     36:        7       0       0
                     37: .PP
                     38: .nf
                     39: RM05 partitions
                     40:        disk    start   length
                     41:        0       0       15884
                     42:        1       16416   33440
                     43:        2       0       500992
                     44:        3       341696  15884
                     45:        4       358112  55936
                     46:        5       414048  36944
                     47:        6       341696  159296
                     48:        7       49856   291346
                     49: .fi
                     50: .DT
                     51: .PP
                     52: It is unwise for all of these files to be present in one installation,
                     53: since there is overlap in addresses and protection becomes
                     54: a sticky matter.
                     55: Ordinarily devices 0 and 6
                     56: on rp06 and rm03 drives,
                     57: and 0, 7, and either 6 or 5, 6, and 7 on rm05 drives.
                     58: Note that the file system sizes are chosen to allow the partitions
                     59: to be copied between the rp06's and rm05's.
                     60: This is done so that systems with mixed drives
                     61: will be able to rearrange file systems easily
                     62: (see also
                     63: .IR up (4)).
                     64: Device 2 is the entire pack,
                     65: and is used in pack-to-pack copying.
                     66: .PP
                     67: The
                     68: block
                     69: files
                     70: access the disk via the system's normal
                     71: buffering mechanism
                     72: and may be read and written without regard to
                     73: physical disk records.
                     74: There is also a `raw' interface
                     75: which provides for direct transmission between the disk
                     76: and the user's read or write buffer.
                     77: A single read or write call results in exactly one I/O operation
                     78: and therefore raw I/O is considerably more efficient when
                     79: many words are transmitted.
                     80: The names of the raw files
                     81: conventionally
                     82: begin with
                     83: an extra `r.'
                     84: .SH FILES
                     85: .ta 2i
                     86: /dev/rp[0-3][a-h]      block files
                     87: .br
                     88: /dev/rrp[0-3][a-h]     raw files
                     89: .SH SEE ALSO
                     90: rp(4)
                     91: .SH BUGS
                     92: In raw I/O
                     93: .I read
                     94: and
                     95: .IR write (2)
                     96: truncate file offsets to 512-byte block boundaries,
                     97: and
                     98: .I write
                     99: scribbles on the tail of incomplete blocks.
                    100: Thus,
                    101: in programs that are likely to access raw devices,
                    102: .I read, write
                    103: and
                    104: .IR lseek (2)
                    105: should always deal in 512-byte multiples.

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