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NetBSD 6.1.5 - man page for sunlabel (netbsd section 8)

SUNLABEL(8)			   BSD System Manager's Manual			      SUNLABEL(8)

NAME
     sunlabel -- read or modify a SunOS disk label

SYNOPSIS
     sunlabel [-mnqs] device

DESCRIPTION
     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:

	   -m	 Ignore an incorrect magic number in the disk label.

	   -n	 Synthesize a new label rather than reading what is there.

	   -q	 Quiet mode - don't print unnecessary babble (currently this suppresses the
		 ``sunlabel>'' prompt).

	   -s	 Ignore checksum errors when reading the label.

     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:

	   ?		     Show a short help message.

	   [abcdefghijklmnop] <cylno> <size>
			     Change partition (see below).

	   L		     Print label, except for the partition table.

	   P		     Print the partition table.

	   Q		     Quit program (error if no write since last change).

	   Q!		     Quit program (unconditionally) [EOF also quits].

	   S		     Set label in the kernel (orthogonal to W).

	   V <name> <value>  Change a non-partition label value.

	   W		     Write (possibly modified) label out.

     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 parti-
     tion'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.

AUTHORS
     der Mouse <mouse@rodents.montreal.qc.ca>

BUGS
     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 warn-
     ings.

     NetBSD doesn't support 16 partitions in a Sun disk label yet.

BSD					December 21, 2002				      BSD


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