.TH VDISK.CONF 5
.SH NAME
vdisk.conf \- Virtual Disk configuration file
.SH SYNOPSIS
.B /etc/vdisk.conf
.SH DESCRIPTION
The
.B /etc/vdisk.conf
is used by
.B vdisk_ctrl
to configure virtual disk devices.  This is done automatically by
.B /etc/rc
at boot time.
.PP
The file has a very simple format: words separated by whitespace.  Comments
start with the
.B '#'
character and continue until end of line.  Separate tokens must be separated
by whitespace.  A command that programs a virtual disk device has the form:
.PP
.RS
.I vdisk
.B =
.I subdisk
.RB "[ " +
.IR subdisk " ] ..."
.RE
.PP
Where the part between [ and ] is repeated zero or more times, so it looks as
if
.I vdisk
is the sum of one or more devices, which is more or less as it is.  The disk
devices are sought relative to the
.B /dev
directory, so names can be short.
.SH EXAMPLE
Suppose a system has two disks,
.B hd0
and
.BR hd5 ,
both too small to install Minix on properly.  One could configure the
disks to have
.B hd1
and
.B hd2
be the root and tmp+swap devices, and to combine
.B hd3
and
.B hd5
into
.B vd0
for /usr.  The
.B vdisk.conf
line is simply:
.PP
.RS
.B "vd0 = hd3 + hd5"
.RE
.PP
It doesn't matter that
.B hd3
is a partition and
.B hd5
is a whole disk.
.SH FILES
.TP 20n
.B /etc/vdisk.conf
Virtual Disk configuration file
.SH "SEE ALSO"
.BR vd (4),
.BR vdisk_ctrl (8),
.BR boot (8).
.SH AUTHOR
Kees J. Bot (kjb@cs.vu.nl)