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Annotation of researchv10dc/man/manb/rk.4, revision 1.1

1.1     ! root        1: .TH RK 4
        !             2: .SH NAME
        !             3: rk \- RK11/RK07 disk driver
        !             4: .SH DESCRIPTION
        !             5: Files with minor device numbers 0 through 7
        !             6: refer to various portions of drive 0,
        !             7: minor devices 8 through 16 refer to drive 1,
        !             8: etc.
        !             9: .PP
        !            10: The range and size of the pseudo-drives for each drive
        !            11: are as follows:
        !            12: .PP
        !            13: .nf
        !            14: .ta .5i +\w'000000    'u +\w'000000    'u
        !            15: RK07 partitions:
        !            16:        disk    start   length
        !            17:        0       0       15884
        !            18:        1       15906   10032
        !            19:        2       0       53780
        !            20:        3       0       0
        !            21:        4       0       0
        !            22:        5       0       0
        !            23:        6       26004   27786
        !            24:        7       0       0
        !            25: .DT
        !            26: .fi
        !            27: .PP
        !            28: On a dual RK07 system
        !            29: partition 0 is used
        !            30: for the root for one drive
        !            31: and partition 6 for the /usr file system.
        !            32: If large jobs are to be run,
        !            33: partition 1 on both drives provides a 10Mbyte paging area.
        !            34: Otherwise
        !            35: partition 2 on the other drive
        !            36: is used as a single large file system.
        !            37: .PP
        !            38: The
        !            39: .I rk
        !            40: files
        !            41: discussed above access the disk via the system's normal
        !            42: buffering mechanism
        !            43: and may be read and written without regard to
        !            44: physical disk records.
        !            45: There is also a `raw' interface
        !            46: which provides for direct transmission between the disk
        !            47: and the user's read or write buffer.
        !            48: A single read or write call results in exactly one I/O operation
        !            49: and therefore raw I/O is considerably more efficient when
        !            50: many words are transmitted.
        !            51: The names of the raw RK files
        !            52: begin with
        !            53: .L rrk
        !            54: and end with a number which selects the same disk
        !            55: as the corresponding
        !            56: .L rk
        !            57: file.
        !            58: .PP
        !            59: In raw I/O the buffer must begin on a word boundary,
        !            60: and counts should be a multiple of 512 bytes
        !            61: (a disk block).
        !            62: Likewise
        !            63: .IR lseek (2)
        !            64: calls should specify a multiple of 512 bytes.
        !            65: .SH FILES
        !            66: .F /dev/rk?
        !            67: .br
        !            68: .F /dev/rrk?"
        !            69: .SH BUGS
        !            70: In raw I/O
        !            71: .I read
        !            72: and
        !            73: .IR write (2)
        !            74: truncate file offsets to 512-byte block boundaries,
        !            75: and
        !            76: .I write
        !            77: scribbles on the tail of incomplete blocks.
        !            78: Thus,
        !            79: in programs that are likely to access raw devices,
        !            80: .I read, write
        !            81: and
        !            82: .IR lseek (2)
        !            83: should always deal in 512-byte multiples.

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