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File Formats | format.dat(4) |
| format.dat - disk drive configuration
for the format command |
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format.dat enables you to use your specific disk
drives with format(1M).
On Solaris 2.3 and compatible systems, format will automatically
configure and label SCSI drives, so that they need not be defined in format.dat. Three things can be defined in the data file:
- search paths
- disk types
- partition tables.
Syntax
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The following syntax rules apply to the data file:
- The pound # sign is the comment character.
Any text on a line after a pound sign is not interpreted by format.
- Each definition in the format.dat
file appears on a single logical line. If the definition is more than one
line long, all but the last line of the definition must end with a backslash
(\).
- A definition consists of a series of assignments
that have an identifier on the left side and one or more values on the right
side. The assignment operator is the equal sign (=). Assignments within
a definition must be separated by a colon (:).
- White space is ignored by format(1M). If you want an assigned
value to contain white space, enclose the entire value in double quotes
("). This will cause the white space within quotes to be preserved as part
of the assignment value.
- Some assignments can have multiple values on
the right hand side. Separate values by a comma (,).
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Keywords
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The data file contains disk definitions that are read in by format(1M) when
it starts up. Each definition starts with one of the following keywords: search_path, disk_type, and partition.
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search_path
- 4.x: Tells format
which disks it should search for when it starts up. The list in the default
data file contains all the disks in the GENERIC configuration file. If
your system has disks that are not in the GENERIC configuration file, add
them to the search_path definition in your data file.
The data file can contain only one search_path definition.
However, this single definition lets you specify all the disks you have
in your system.
5.x: By default, format(1M)
understands all the logical devices that are of the form /dev/rdsk/cntndnsn; hence search_path is not normally defined
on a 5.x system.
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disk_type
- Defines the controller and disk model. Each disk_type
definition contains information concerning the physical geometry of the
disk. The default data file contains definitions for the controllers and
disks that the Solaris operating environment supports. You need to add
a new disk_type only if you have an unsupported disk.
You can add as many disk_type definitions to the data
file as you want.
The following controller types are supported by format(1M):
- XY450
- Xylogics 450 controller (SMD)
- XD7053
- Xylogics 7053 controller
(SMD)
- SCSI
- True SCSI (CCS or SCSI-2)
- ISP-80
- IPI panther controller
The keyword itself is assigned the name of the disk type. This name
appears in the disk's label and is used to identify the disk type whenever format(1M) is
run. Enclose the name in double quotes to preserve any white space in the
name.
Below are lists of identifiers for supported controllers. Note that
an asterisk ('*') indicates the identifier is mandatory for that controller
-- it is not part of the keyword name.
The following identifiers are assigned values in all disk_type definitions:
-
acyl*
- alternate cylinders
-
asect
- alternate
sectors per track
-
atrks
- alternate
tracks
-
fmt_time
- formatting
time per cylinder
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ncyl*
- number
of logical cylinders
-
nhead*
- number
of logical heads
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nsect*
- number
of logical sectors per track
-
pcyl*
- number
of physical cylinders
-
phead
- number
of physical heads
-
psect
- number
of physical sectors per track
-
rpm*
- drive
RPM
These identifiers are for SCSI and MD-21 Controllers
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read_retries
- page 1 byte 3 (read retries)
-
write_retries
- page 1 byte 8 (write retries)
-
cyl_skew
- page
3 bytes 18-19 (cylinder skew)
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trk_skew
- page
3 bytes 16-17 (track skew)
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trks_zone
- page 3 bytes 2-3 (tracks per zone)
-
cache
- page
38 byte 2 (cache parameter)
-
prefetch
- page
38 byte 3 (prefetch parameter)
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max_prefetch
- page 38 byte 4 (minimum prefetch)
-
min_prefetch
- page 38 byte 6 (maximum prefetch)
Note: The Page 38 values are device-specific. Refer
the user to the particular disk's manual for these values.
For SCSI disks, the following geometry specifiers may cause a mode
select on the byte(s) indicated:
-
asect
- page 3 bytes 4-5 (alternate sectors
per zone)
-
atrks
- page
3 bytes 8-9 (alt. tracks per logical unit)
-
phead
- page
4 byte 5 (number of heads)
-
psect
- page
3 bytes 10-11 (sectors per track)
And these identifiers are for SMD Controllers Only
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bps*
- bytes per sector (SMD)
-
bpt*
- bytes
per track (SMD)
Note: under SunOS 5.x, bpt is only required for SMD
disks. Under SunOS 4.x, bpt was required for all disk types, even though
it was only used for SMD disks.
And this identifier is for XY450 SMD Controllers Only
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drive_type*
- drive type (SMD) (just call
this "xy450 drive type")
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partition
- Defines a partition table for a specific disk type. The partition
table contains the partitioning information, plus a name that lets you refer
to it in format(1M).
The default data file contains default partition definitions for several
kinds of disk drives. Add a partition definition if you repartitioned any
of the disks on your system. Add as many partition definitions to the data
file as you need.
Partition naming conventions differ in SunOS 4.x and in SunOS 5.x.
4.x: the partitions are named as a, b, c, d, e, f, g, h.
5.x: the partitions are referred to by numbers 0, 1, 2, 3, 4, 5, 6, 7.
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| Example 1. A sample disk_type and partition.
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Following is a sample disk_type and partition definition in format.dat file for SUN0535
disk device.
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disk_type = "SUN0535" \
: ctlr = SCSI : fmt_time = 4 \
: ncyl = 1866 : acyl = 2 : pcyl = 2500 : nhead = 7 : nsect = 80 \
: rpm = 5400
partition = "SUN0535" \
: disk = "SUN0535" : ctlr = SCSI \
: 0 = 0, 64400 : 1 = 115, 103600 : 2 = 0, 1044960 : 6 = 300, 876960
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/etc/format.dat
- default data file if format -x is not specified, nor is there a format.dat file in the current directory.
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format(1M)
System Administration Guide: Basic Administration
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