Series 800 Only
disksecn - calculate default disk section sizes
disksecn [-p|-d] [-b block_size] [-n disk_name]
disksecn is used to calculate the disk section sizes based on the
Berkeley disk partitioning method.
disksecn recognizes the following options:
-p Produce tables suitable for inclusion in the
-d Produce tables suitable for generating the disk
description file /etc/disktab.
-b block_size When generating the above tables, use a sector
size of block_size bytes, where block_size can be
256, 512, 1024, or 2048. Defaults to DEV_BSIZE
(defined in <sys/param.h>) if not specified.
-n disk_name Specifies the disk name to be used in calculating
sector sizes; for example, hp7912 or hp7945. If
an unknown disk name is specified, disksecn
prompts the user for the necessary disk
If neither -p nor -d table selection switches are specified a default
table of the section sizes and range of cylinders used is output.
Disk section sizes are based on the total amount of space on the disk
as given in the table below (all values are supplied in units of 256-
byte sectors). If the disk is smaller than approximately 44 Mbytes,
disksecn aborts and returns the message disk too small, calculate by
Section 44-56MB 57-106MB 107-332MB 333+MB
0 97120 97120 97120 97120
1 39064 39064 143808 194240
3 39064 39064 78128 117192
4 unused 48560 110096 429704
6 7992 7992 7992 7992
10 unused unused unused 516096
It is important to note the difference between the block size passed
into disksecn via the -b switch argument and the sector size the user
is asked to input when an unknown disk name is passed to disksecn via
Hewlett-Packard Company - 1 - HP-UX Release 11i: November 2000
Series 800 Only
the -n switch argument.
The block size is the sector size that disksecn assumes the disk to
have when it prints the requested tables. All information printed in
the tables is adjusted to reflect this assumed sector size (block
size) passed in by the user. The sector size requested by disksecn
when an unknown disk name is passed does not necessarily have to be
the same as the assumed sector size (block size) passed in by the -b
For example, a user wants to see the device driver tables for the disk
named hp7945 with an assumed sector size (block size) of 256 bytes.
The user has the following information about the hp7945 disk:
Disk type = winchester
Sector size = 512
Number of sectors per track (512 byte sectors) = 16
Number of tracks = 7
Number of cylinders = 968
Revolutions per minute = 3600
The user invokes disksecn by typing the following command:
disksecn -p -b 256 -n hp7945
Assuming that hp7945 is an unknown disk name, disksecn prompts the
user for the necessary disk information. The user should input the
information as shown above, reflecting a sector size of 512 bytes.
All the information will be adjusted within disksecn to reflect the
assumed sector size (block size) of 256 bytes, passed as the argument
of the -b switch, before the requested device driver table is output.
This adjustment also takes place when the disk name is known and an
assumed sector size (block size) is passed in as the argument of the
-b switch which is not DEV_BSIZE bytes, the assumed sector size (block
size) used to create the etc/disktab file.
disksecn returns the following values:
0 Successful completion.
1 Usage error.
2 User did not input parameters for an unknown disk.
3 Disk too small or an invalid block size.
disksecn aborts and prints an error message under the following
+ disksecn was invoked without specifying a disk name.
+ Requested both -p and -d switch.
Hewlett-Packard Company - 2 - HP-UX Release 11i: November 2000
Series 800 Only
+ Illegal block size requested.
+ Unknown disk name was specified and user did not supply disk
+ Disk's maximum storage space is less than approximately 44 MB.
Alternate names are not included in the output when the -d switch is
Blanks are required in the command line between each of the switches
when invoking disksecn.
A blank is required between the -n switch and the disk name argument
to that switch. For example:
disksecn -p -b 1024 -n hp9712
disksecn does not save the block size used to generate the
/etc/disktab disk description file. The system assumes that the block
size used was DEV_BSIZE when it reads the information stored in the
disksecn was developed by the University of California, Berkeley.
Hewlett-Packard Company - 3 - HP-UX Release 11i: November 2000