BRU utility Post: 37509

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LEARN ABOUT V7

rp

RP(4)							     Kernel Interfaces Manual							     RP(4)

NAME

       rp - RP-11/RP03 moving-head disk

DESCRIPTION

       The  files  rp0 ... rp7 refer to sections of RP disk drive 0.  The files rp8 ... rp15 refer to drive 1 etc.  This allows a large disk to be
       broken up into more manageable pieces.

       The origin and size of the pseudo-disks on each drive are as follows:

	    disk start	   length
	    0	 0    81000
	    1	 0    5000
	    2	 5000 2000
	    3	 7000 74000
	    4-7  unassigned

       Thus rp0 covers the whole drive, while rp1, rp2, rp3 can serve usefully as a root, swap, and mounted user file system respectively.

       The rp files access the disk via the system's normal buffering mechanism and may be read  and  written  without	regard	to  physical  disk
       records.   There  is also a `raw' interface which provides for direct transmission between the disk and the user's read or write buffer.  A
       single read or write call results in exactly one I/O operation and therefore raw I/O is considerably more efficient  when  many	words  are
       transmitted.   The  names of the raw RP files begin with rrp and end with a number which selects the same disk section as the corresponding
       rp file.

       In raw I/O the buffer must begin on a word boundary.

FILES

       /dev/rp?, /dev/rrp?

SEE ALSO

       hp(4)

BUGS

       In raw I/O read and write(2) truncate file offsets to 512-byte block boundaries, and write scribbles on	the  tail  of  incomplete  blocks.
       Thus, in programs that are likely to access raw devices, read, write and lseek(2) should always deal in 512-byte multiples.

																	     RP(4)