rl - RL-11/RL01, RL02 moving-head disk
NRL rl_drives # RL01/02
#Name Unit# Addr Vector Br Handler(s) # Comments
rl ? 174400 160 5 rlintr # rl-01/02
major device number(s):
minor device encoding:
bits 0007 specify partition of RL drive
bits 0070 specify RL drive
The block 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 buf-
fer. 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
files conventionally begin with an extra `r.'
In raw I/O the buffer must begin on a word (even) boundary, and counts should be a multi-
ple of 512 bytes (a disk sector). Likewise seek calls should specify a multiple of 512
The RL01 drives are each 10240 blocks long and the RL02 drives are 20480 blocks long.
On a RL02 there is room for a full sized root ('a') partition and a reasonable sized swap
('b') partition. The RL01 can only (realistically) have a single 5mb partition.
/dev/rl[0-3][a-h] block files
/dev/rrl[0-3][a-h] raw files
/dev/MAKEDEV script to create special files
/dev/MAKEDEV.local script to localize special files
hk(4), ra(4), ram(4), rk(4), rp(4), rx(4), si(4), xp(4), dtab(5), autoconfig(8)
rl%d: hard error sn%d cs=%b da=%b. An unrecoverable error occurred during transfer of the
specified sector of the specified disk. The contents of the two error registers are also
printed in octal and symbolically with bits decoded. The error was either unrecoverable,
or a large number of retry attempts could not recover the error.
rl%d: hard error sn%d mp=%b da=%b. An unrecoverable drive error occured during transfer
of the specified sector of the specified disk. The contents of the two error registers
are also printed in octal and symbolically with bits decoded. The error was either unre-
coverable, or a large number of retry attempts could not recover the error.
rl%d: write locked. The write protect switch was set on the drive when a write was
attempted. The write operation is not recoverable.
rl%d: can't get status. A ``get status'' command on the specified drive failed. The
error is unrecoverable.
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.
DEC-standard error logging should be supported.
A program to analyze the logged error information (even in its present reduced form) is
3rd Berkeley Distribution August 20, 1987 RL(4)