1RL(4) Kernel Interfaces Manual RL(4)
2
6 rl - RL-11/RL01, RL02 moving-head disk
7
9 /sys/conf/SYSTEM:
10 NRL rl_drives # RL01/02
11 /etc/dtab:
13 #Name Unit# Addr Vector Br Handler(s) # Comments
14 rl ? 174400 160 5 rlintr # rl-01/02
15 major device number(s):
17 raw: 16
18 block: 7
19 minor device encoding:
20 bits 0007 specify partition of RL drive
21 bits 0070 specify RL drive
22
24 The block files access the disk via the system's normal buffering mech‐
25 anism and may be read and written without regard to physical disk
26 records. There is also a `raw' interface which provides for direct
27 transmission between the disk and the user's read or write buffer. A
28 single read or write call results in exactly one I/O operation and
29 therefore raw I/O is considerably more efficient when many words are
30 transmitted. The names of the raw files conventionally begin with an
31 extra `r.'
32 In raw I/O the buffer must begin on a word (even) boundary, and counts
34 should be a multiple of 512 bytes (a disk sector). Likewise seek calls
35 should specify a multiple of 512 bytes.
36
38 The RL01 drives are each 10240 blocks long and the RL02 drives are
39 20480 blocks long.
40 On a RL02 there is room for a full sized root ('a') partition and a
42 reasonable sized swap ('b') partition. The RL01 can only (realisti‐
43 cally) have a single 5mb partition.
44
46 /dev/rl[0-3][a-h] block files
47 /dev/rrl[0-3][a-h] raw files
48 /dev/MAKEDEV script to create special files
49 /dev/MAKEDEV.local script to localize special files
50
52 hk(4), ra(4), ram(4), rk(4), rp(4), rx(4), si(4), xp(4), dtab(5), auto‐
53 config(8)
54
56 rl%d: hard error sn%d cs=%b da=%b. An unrecoverable error occurred
57 during transfer of the specified sector of the specified disk. The
58 contents of the two error registers are also printed in octal and sym‐
59 bolically with bits decoded. The error was either unrecoverable, or a
60 large number of retry attempts could not recover the error.
61 rl%d: hard error sn%d mp=%b da=%b. An unrecoverable drive error
63 occured during transfer of the specified sector of the specified disk.
64 The contents of the two error registers are also printed in octal and
65 symbolically with bits decoded. The error was either unrecoverable, or
66 a large number of retry attempts could not recover the error.
67 rl%d: write locked. The write protect switch was set on the drive when
69 a write was attempted. The write operation is not recoverable.
70 rl%d: can't get status. A ``get status'' command on the specified
72 drive failed. The error is unrecoverable.
73
75 In raw I/O read and write(2) truncate file offsets to 512-byte block
76 boundaries, and write scribbles on the tail of incomplete blocks.
77 Thus, in programs that are likely to access raw devices, read, write
78 and lseek(2) should always deal in 512-byte multiples.
79 DEC-standard error logging should be supported.
81 A program to analyze the logged error information (even in its present
83 reduced form) is needed.
843rd Berkeley Distribution August 20, 1987 RL(4)