Host Connection Program Guide and Reference
3-42
HCON Display Session Pooling
Pooling is a method for partitioning resources to ensure a logical distribution of the
workload.
• Hardware adapters
• A collection of logical units (LUs) based on departmental requirements
• Connectivity to the host
• Host transaction application environment
• Type or frequency of usage
When an HCON session is initiated, an available session from the pool is used. When the
session ends, the session is returned to the pool. Session pooling applies to display
sessions only. Session pooling support is available for these connectivity types:
• Distributed Function Terminal (DFT)
• Host Interface Adapter (HIA)
• SNA Node T2.1
DFT and HIA pools are automatically defined based on the adapter name. SNA Node T2.1
pools must be defined by using the SNA SMIT Configure LU Profiles for 3270
Communication option.
HCON DFT Pooling
The DFT Session Configuration and Adapter Relationship figure shows the logical
relationship between a display session, 3270 coax adapters, and session resources.
HCON Configuration for a Session
Add DFT Display Session
HCON User Name
.
Communication Device
John
3270c0
3270c0
3270c1
3270c2
3270c3
Add DFT Display Session
HCON User Name
.
Communication Device
John
3270c3
Control
Unit
DFT Session Configuration and Adapter Relationship
Session
Resources
Coax
Adapters
These restrictions apply to DFT pooling:
• The controller, configured through control unit customization, defines the number of
sessions available on a given coax port. The controller allows up to five sessions per
port.
• The Virtual Telecommunications Access Method/Network Control Program (VTAM/NCP)
defines the session type, display or printer, for each session. The host definition and
session profile must have the same session type configuration.
SNA DFT
Only display sessions are supported for SNA DFT. All sessions are available to defined
users. According to the pooling principle, each 3270 connection adapter is an LU pool. The
LUs are assigned by the first available, lowest address. All users are pooled within the same
adapter. The emulator issues an error message if a user attempts to start a session when
the resource is not available.
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