Bull DPX/20 Installationsanleitung PDF herunterladen (Seite 148)

Host Connection Program Guide and Reference

3-46

Disable SNA Node T2.1 Display Session Pooling

To disable pooling support for a session, use the entire SNA Logical Connection

Profile name. The entire profile name must be entered because the prefix and *

(asterisk) value are only used to enable pooling.

Use these examples of LU prefix values in the SNA Logical Connection Prefix or

Profile field:

Value Meaning

POOL1* Select any available LU from POOL1.

POOL105 Connect to the host using LU Connection Profile POOL105 and its related

profiles. Pooling is not in effect for this session.

LU Pooling Management

The stathcon command and the HCON Control option in SMIT are available for LU pooling

management. The stathcon command lists the status of HCON session profiles and SNA

logical unit (LU) pools. The HCON Control option in SMIT is useful for administering host

resources and balancing the load between user needs and system requirements.

To manage LU pooling you can:

• Monitor specific LU pools during peak periods to ensure fair distribution.

• Reassign LU pools with low usage to other pools. The reassignment process requires

restarting the SNA subsystem.

• Display the status of each LU within a pool for session management and host problem

determination.

• Identify congested pools.

• Perform pool assignment by using the sna3270lu command in a SMIT shell script (see

SNA documentation for more information).

HCON Screen Size Management

The screen size of the display session depends on the attachment protocol and the model

size defined in the session profile. For non-SNA DFT, HIA, and TCP/IP sessions, the default

screen size is 24 rows by 80 columns. The alternate screen size is the model size

configured in the HCON session profile. The screen size information is returned to the host

application during a 3270 Read Partition Query function.

For SNA sessions, the session characteristics, including screen size, are defined using a

LOGMODE entry within the host LOGMODE table. Users select the appropriate mode entry

during session establishment time to achieve the desired screen size. (For more

information, refer to “Setting Up the Host Logmode Table for HCON” on page 3-68.) The

session characteristics are transported to HCON using an SNA BIND command. Both the

default and alternate screen sizes can be determined from the BIND command parameters

(bytes 20 through 24) during the primary logical unit (PLU) to Secondary Logical Unit (SLU)

session establishment time.

For the SSCP to LU session, the screen size is fixed at 24 rows by 80 columns. When the

LU to LU session is established, the default and alternate sizes are returned to the host

application during a Read Partition Query function. If the session owner changes to SSCP

by pressing the System Request (SysReq) key, the screen size is set to the default.

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