Technical data

Tuning Techniques
2.1 Subsystem Attributes
To modify subsystem attributes in the SYSCONFIGTAB.DAT file, follow these
steps:
1. Use the sysconfigdb utility to update the system configuration table, as
described in Section 2.1.3.1.
2. Reload the subsystem. A dynamic subsystem can be unloaded and reloaded
using the sysconfig utility. A static subsystem is reloaded when the TCP/IP
Services software is restarted.
2.1.3.1 Format of the SYSCONFIGTAB File
The TCPIP$ETC:SYSCONFIGTAB.DAT file is an ASCII text file in stanza file
format. Do not edit the sysconfigtab file directly. Always use the recommended
commands to modify attribute values in the sysconfigtab file.
An entry in the sysconfigtab file is formatted as follows:
subsystem1:
parameter1=value1
parameter1=value2
subsystem2:
parameter1=value1
parameter1=value2
To modify a subsystem attribute permanently, create a stanza-formatted file in
your own directory. In the following example, the stanza file is named SOCKET_
ATTRS.TXT.
$ TYPE SOCKET_ATTRS.TXT
socket:
socket_param1 = socket_value1
$
After you create the stanza file, update the system configuration table using the
sysconfigdb utility.
To run the sysconfigdb utility, enter the following commands:
$ TCPIP
TCPIP> sysconfigdb
To update the system configuration table, use the sysconfigdb command with the
-u option. Specify the stanza file on the command line using the -f option. The
following is the format of the sysconfigdb command:
TCPIP> sysconfigdb -u -f stanza-filename subsystem
In this command line, stanza-filename is the file name of the stanza file that
you created. The value for subsystem is the subsystem name for which you are
changing an attribute.
The sysconfigdb command reads the specified file and updates the sysconfigtab
file. The modifications are made to the subsystem when it is reloaded.
For example, the following stanza file (TABLE_MGR.STANZA) defines the
attributes for two subsystems, TABLE_MGR_1 and TBL_MGR_2.
$ TYPE TABLE_MGR.STANZA
table_mgr_1:
size = 10
name = Ten-Element-Table
tbl_mgr_2:
size = 5
name = Five-Element-Table
Tuning Techniques 2–5