| 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>LPQQ!SW).V
    <name> <value>WThe 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 |