.\"	$OpenBSD: hk.4,v 1.6 2001/06/20 16:49:43 millert Exp $
.\"	$NetBSD: hk.4,v 1.3 1996/03/03 17:13:37 thorpej Exp $
.\"
.\" Copyright (c) 1980, 1991 Regents of the University of California.
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.\"    must display the following acknowledgement:
.\"	This product includes software developed by the University of
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.\"     from: @(#)hk.4	6.4 (Berkeley) 3/27/91
.\"
.Dd March 27, 1991
.Dt HK 4 vax
.Os
.Sh NAME
.Nm hk
.Nd
.Tn RK6-11 Ns / Tn RK06
and
.Tn RK07
disk interface
.Sh SYNOPSIS
.Cd "controller hk0 at uba? csr 0177440 vector rkintr"
.Cd "disk rk0 at hk0 drive 0"
.Sh DESCRIPTION
The
.Nm hk
driver
is a typical block-device disk driver; block device
.Tn I/O
is
described in
.Xr physio 9 .
.Pp
The script
.Xr MAKEDEV 8
should be used to create the special files; if a special file
needs to be created by hand consult
.Xr mknod 8 .
.Sh DISK SUPPORT
Special file names begin with
.Sq Li hk
and
.Sq Li rhk
for the block and character files respectively. The second
component of the name, a drive unit number in the range of zero to
seven, is represented by a
.Sq Li ?
in the disk layouts below. The last component is the file system partition
which is designated
by a letter from
.Sq Li a
to
.Sq Li h .
and
corresponds to a minor device number set: zero to seven,
eight to 15, 16 to 23 and so forth for drive zero, drive two and drive
three respectively.
The location and size (in sectors) of the
partitions for the
.Tn RK06
and
.Tn RK07
drives are as follows:
.Bl -column header diskx undefined length
.Tn RK07 No partitions:
.Sy	disk	start	length	cyl
	hk?a	0	15884	0-240
	hk?b	15906	10032	241-392
	hk?c	0	53790	0-814
	hk?d	25938	15884	393-633
	hk?f	41844	11792	634-814
	hk?g	25938	27786	393-813

.Tn RK06 No partitions
.Sy	disk	start	length	cyl
	hk?a	0	15884	0-240
	hk?b	15906	11154	241-409
	hk?c	0	27126	0-410
.El
.Pp
On a dual
.Tn RK-07
system
partition hk?a is used
for the root for one drive
and partition hk?g for the /usr file system.
If large jobs are to be run using
hk?b on both drives as swap area provides a 10Mbyte paging area.
Otherwise
partition hk?c on the other drive
is used as a single large file system.
.Sh FILES
.Bl -tag -width /dev/rhk[0-7][a-h] -compact
.It Pa /dev/hk[0-7][a-h]
block files
.It Pa /dev/rhk[0-7][a-h]
raw files
.El
.Sh DIAGNOSTICS
.Bl -diag
.It "hk%d%c: hard error %sing fsbn %d[-%d] cs2=%b ds=%b er=%b."
An unrecoverable error occurred during transfer of the specified
filesystem block number(s),
which are logical block numbers on the indicated partition.
The contents of the cs2, ds and er registers are printed
in octal and symbolically with bits decoded.
The error was either unrecoverable, or a large number of retry attempts
(including offset positioning and drive recalibration) could not
recover the error.
.Pp
.It rk%d: write locked.
The write protect switch was set on the drive
when a write was attempted.  The write operation is not recoverable.
.Pp
.It rk%d: not ready.
The drive was spun down or off line when it was
accessed.  The i/o operation is not recoverable.
.Pp
.It rk%d: not ready (came back!).
The drive was not ready, but after
printing the message about being not ready (which takes a fraction
of a second) was ready.  The operation is recovered if no further
errors occur.
.Pp
.It rk%d%c: soft ecc reading fsbn %d[-%d].
A recoverable
.Tn ECC
error occurred on the
specified sector(s) in the specified disk partition.
This happens normally
a few times a week.  If it happens more frequently than
this the sectors where the errors are occurring should be checked to see
if certain cylinders on the pack, spots on the carriage of the drive
or heads are indicated.
.Pp
.It hk%d: lost interrupt.
A timer watching the controller detected
no interrupt for an extended period while an operation was outstanding.
This indicates a hardware or software failure.  There is currently a
hardware/software problem with spinning down drives while they are
being accessed which causes this error to occur.
The error causes a
.Tn UNIBUS
reset, and retry of the pending operations.
If the controller continues to lose interrupts, this error will recur
a few seconds later.
.El
.Sh SEE ALSO
.Xr hp 4 ,
.Xr uda 4 ,
.Xr up 4 ,
.Xr syslogd 8
.Sh HISTORY
The
.Nm
driver appeared in
.Bx 4.1 .
.Sh BUGS
The
.Xr write
function
scribbles on the tail of incomplete blocks.
.Pp
.Tn DEC Ns -standard
error logging should be supported.
.Pp
A program to analyze the logged error information (even in its
present reduced form) is needed.
.Pp
The partition tables for the file systems should be read off each
pack, as they are never quite what any single installation would prefer,
and this would make packs more portable.
.Pp
The
.Tn RK07
g partition size in rk.c disagrees with that in
.Pa /etc/disktab.