SunOS man pages : fmthard (1)
Maintenance Commands fmthard(1M)
NAME
fmthard - populate VTOC on hard disks
SYNOPSIS
SPARC
fmthard -d data | -n volume_name | -s datafile [ -i ]
/dev/rdsk/c? [ t? ] d?s2
IA
fmthard -d data | -n volume_name | -s datafile [ -i ] [
-p pboot ] [ -b bootblk ] /dev/rdsk/c? [ t? ] d?s2
DESCRIPTION
The fmthard command updates the VTOC (Volume Table of Con-
tents) on hard disks and, on IA systems, adds boot informa-
tion to the Solaris fdisk partition. One or more of the
options -s datafile, -d data, or -n volume_name must be used
to request modifications to the disk label. To print disk
label contents, see prtvtoc(1M). The /dev/rdsk/c?[t?]d ?s2
file must be the character special file of the device where
the new VTOC is to be installed. On IA systems, fdisk(1M)
must be run on the drive before fmthard.
If you are using an IA system, note that the term ``parti-
tion'' in this page refers to slices within the IA fdisk
partition on IA machines. Do not confuse the partitions
created by fmthard with the partitions created by fdisk.
OPTIONS
The following options apply to fmthard:
-i This option allows the command to create the desired
VTOC table, but prints the information to standard
output instead of modifying the VTOC on the disk.
-d data
The data argument of this option is a string
representing the information for a particular parti-
tion in the current VTOC. The string must be of the
format part:tag:flag:start:size where part is the par-
tition number, tag is the ID TAG of the partition,
flag is the set of permission flags, start is the
starting sector number of the partition, and size is
the number of sectors in the partition. See the
description of the datafile below for more information
on these fields.
-n volume_name
This option is used to give the disk a volume_name up
to 8 characters long.
-s datafile
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Maintenance Commands fmthard(1M)
This option is used to populate the VTOC according to
a datafile created by the user. If the datafile is
"-", fmthard reads from standard input. The datafile
format is described below. This option causes all of
the disk partition timestamp fields to be set to zero.
Every VTOC generated by fmthard will also have partition 2,
by convention, that corresponds to the whole disk. If the
input in datafile does not specify an entry for partition 2,
a default partition 2 entry will be created automatically in
VTOC with the tag V_BACKUP and size equal to the full size
of the disk.
The datafile contains one specification line for each parti-
tion, starting with partition 0. Each line is delimited by a
new-line character (\n). If the first character of a line
is an asterisk (*), the line is treated as a comment. Each
line is composed of entries that are position-dependent,
separated by "white space" and having the following format:
partition tag flag starting_sector size_in_sectors
where the entries have the following values.
partition
The partition number. Currently, for Solaris SPARC, a
disk can have up to 8 partitions, 0-7. Even though the
partition field has 4 bits, only 3 bits are currently
used. For IA, all 4 bits are used to allow slices
0-15. Each Solaris fdisk partition can have up to 16
slices.
tag The partition tag: a decimal number. The following are
reserved codes: 0 (V_UNASSIGNED), 1 (V_BOOT), 2
(V_ROOT), 3 (V_SWAP), 4 (V_USR), 5 (V_BACKUP), 6
(V_STAND), 7 (V_VAR), and 8 (V_HOME).
flag The flag allows a partition to be flagged as unmount-
able or read only, the masks being: V_UNMNT 0x01, and
V_RONLY 0x10. For mountable partitions use 0x00.
starting_sector
The sector number (decimal) on which the partition
starts.
size_in_sectors
The number (decimal) of sectors occupied by the parti-
tion.
Note that you can save the output of a prtvtoc command to a
file, edit the file, and use it as the datafile argument to
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Maintenance Commands fmthard(1M)
the -s option.
IA Options
The functionality provided by the following two IA options
is also provided by installboot(1M). Because the func-
tionality described here may be removed in future versions
of fmthard, you should use installboot to install boot
records. The following options currently apply to fmthard:
-p pboot
This option allows the user to override the default
partition boot file, /usr/platform/platform-
name/lib/fs/ufs/pboot. The partition boot file is
platform dependent, where platform-name can be deter-
mined using the -i option to uname(1).
-b bootblk
This option allows the user to override the default
bootblk file, /usr/platform/platform-
name/lib/fs/ufs/bootblk. The boot block file is plat-
form dependent, where platform-name can be determined
using the -i option to uname(1).
ATTRIBUTES
See attributes(5) for descriptions of the following attri-
butes:
____________________________________________________________
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
|_____________________________|_____________________________|
| Availability | SUNWcsu |
|_____________________________|_____________________________|
SEE ALSO
uname(1), format(1M), prtvtoc(1M), attributes(5)
IA Only
fdisk(1M), installboot(1M)
NOTES
Special care should be exercised when overwriting an exist-
ing VTOC, as incorrect entries could result in current data
being inaccessible. As a precaution, save the old VTOC.
fmthard cannot write a disk label on an unlabeled disk. Use
format(1M) for this purpose.
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