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Annotation of researchv10dc/dist/man/v4/man4/rk.4, revision 1.1.1.1

1.1       root        1: .th RK IV 10/15/73
                      2: .sh NAME
                      3: rk  \*-  RK-11/RK03 (or RK05) disk
                      4: .sh DESCRIPTION
                      5: .it Rk?
                      6: refers to an entire RK03 disk as a single sequentially-addressed
                      7: file.
                      8: Its 256-word blocks are numbered 0 to 4871.
                      9: .s3
                     10: Drive numbers (minor devices)
                     11: of eight and greater are treated specially.
                     12: Drive 8+\fIx\fR is the \fIx\fR+1 way
                     13: interleaving of devices
                     14: rk0 to rk\fIx\fR.
                     15: Thus blocks on rk10 are distributed alternately
                     16: among rk0, rk1, and rk2.
                     17: .sh FILES
                     18: /dev/rk?
                     19: .sh BUGS
                     20: Care should be taken in using the interleaved files.
                     21: First, the same drive should not be accessed simultaneously
                     22: using the ordinary name and as part of an interleaved file,
                     23: because the same physical
                     24: blocks
                     25: have in effect two different
                     26: names; this fools the system's buffering strategy.
                     27: Second, the combined files cannot be used for swapping.

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