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Q326449: LUA Session Allocation Behavior Between Two TN3270 Services

Article: Q326449
Product(s): Microsoft SNA Server
Version(s): 4.0,4.0 SP1,4.0 SP2,4.0 SP3,4.0 SP4
Operating System(s): 
Keyword(s): Kbhostintegserv2000
Last Modified: 24-JUL-2002

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The information in this article applies to:

- Microsoft Host Integration Server 2000 
- Microsoft SNA Server, versions 4.0, 4.0 SP1, 4.0 SP2, 4.0 SP3, 4.0 SP4 
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SUMMARY
=======

This article describes the behavior of a Logical Unit Application (LUA) session
allocation when a 3270 client that is configured for TN3270 specifies the server
name or IP address and pool name when using multiple TN3270 services.

MORE INFORMATION
================

All 3270 clients that are configured in TN3270 mode and that specify a server
name or IP address and LUA pool acquire an LUA logical unit (LU) from the server
or IP address that the client specified.

For example:

- Server A and server B are in the same SNA Subdomain.

- Available LUA LUs from both servers are assigned to a common LUA pool named
  LUAPOOL.

- LUAPOOL is assigned to both TN3270 Services on server A and server B.

- A 3270 client specifying server A using LUAPOOL will always acquire an LUA LU
  from server A until all LUA LUs are used up from server A. After that, LUA
  LUs are pulled from server B.

If the TN3270 service or server A is inactive or unavailable, the 3270 client
will not acquire an LUA LU from server B. Instead, you receive an error similar
to the following:

  Host Connection Timed Out.

REFERENCES
==========

For additional information, click the article numbers below to view the articles
in the Microsoft Knowledge Base:

  Q185446 TN3270 Server LUA Pool Use Should Load Balance Across Servers

  Q236591 SNA Server LU Allocation Favors Active Remote Connections over
  Available Local Connections

  Q266275 HIS 2000 Client LU6.2 Load Balancing Across SNA Server Services

  Q268127 TN3270 LUs Must Be Pooled Across Multiple Nodes or Connections

Additional query words:

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Keywords          : Kbhostintegserv2000 
Technology        : kbAudDeveloper kbSNAServSearch kbHostIntegServ2000 kbSNAServ400 kbSNAServ400SP1 kbSNAServ400SP2 kbSNAServ400SP3 kbSNAServ400SP4
Version           : :4.0,4.0 SP1,4.0 SP2,4.0 SP3,4.0 SP4
Issue type        : kbinfo

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