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

SUNLABEL(8)			   BSD 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:

	   -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

	   ?		     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.

     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 warn-

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

BSD					December 21, 2002				      BSD

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