SUNLABEL(8) | System Manager's Manual | SUNLABEL(8) |
sunlabel
—
sunlabel |
[-mnqs ] device |
sunlabel
reads or modifies a SunOS disk label on
device, which is used by the PROM on
NetBSD/sparc hardware to find partitions to boot from.
sunlabel
only reads/writes the first 512 bytes of
device.
The supported options are:
Note that -m
is dangerous, especially when
combined with -s
, since it will then happily believe
whatever garbage it may find in the label. When using these flags, all
values should be checked carefully, both those printed by
L
and the partition table printed by
P
.
sunlabel
prints a prompt
“sunlabel>” and expects commands. The following commands
are understood:
[abcdefghijklmnop]
<cylno> <size>L
P
Q
Q!
S
W
).V
<name> <value>W
The a
through p
commands will accept, for the <size> parameter,
the nnn/nnn/nnn syntax used by SunOS 4.x
format
. (For those not familiar with this syntax,
a/b/c means a cylinders +
b tracks + c sectors. For
example, if the disk has 16 tracks of 32 sectors,
3/4/5 means (3*16*32)+(4*32)+5=1669. This calculation
always uses the nsect and ntrack
values as printed by the L
command; in particular,
if they are zero (which they will initially be if -n
is used), this syntax is not very useful. Some additional strings are
accepted. For the <cylno> parameter,
“end-X” (where X is a partition letter)
indicates that the partition should start with the first free cylinder after
partition X; “start-X” indicates that
the partition should start at the same place as partition
X. For the <size>
parameter, “end-X” indicates that the partition should end at
the same place as partition X (even if partition
X ends partway through a cylinder);
“start-X” indicates that the partition should end with the
last cylinder before partition X; and
“size-X” means that the partition's size should exactly match
partition X's size.
Note that sunlabel
supports 16 partitions.
SunOS supports only 8. Labels written by sunlabel
,
when partitions i through p are
all set offset=0 size=0, are identical to Sun labels.
If any of the “extended” partitions are nontrivial,
information about them is tucked into some otherwise unused space in the Sun
label format.
The V
command changes fields printed by
the L
command. For example, if the
L
command prints
ascii: ST15230N cyl 5657 alt 2 hd 19 sec 78 rpm: 0 pcyl: 0 apc: 0 obs1: 0 obs2: 0 intrlv: 1 ncyl: 5657 acyl: 0 nhead: 19 nsect: 78 obs3: 0 obs4: 0
then V
ncyl 6204
would set the ncyl value to 6204, or
V
ascii Seagate ST15230N cyl 5657 hd
19 sec varying would set the ascii-label string to that string.
sunlabel
performs very few consistency checks on the
values you supply, and the ones it does perform never generate errors, only
warnings.
Not very many consistency checks are done on the
V
arguments, and those only produce warnings.
NetBSD doesn't support 16 partitions in a Sun disk label yet.
December 21, 2002 | NetBSD 9.4 |