SUNLABEL(8) | System Manager's Manual | SUNLABEL(8) |
sunlabel
— read or
modify a SunOS disk label
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.
der Mouse <mouse@rodents.montreal.qc.ca>
It may be that the space in the label where the information for the extended partitions is saved is used by SunOS.
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 10.99 |