LUA Pool Cannot Be Assigned to Two TN3270 Servers

• Microsoft SNA Server, versions 3.0, 3.0SP1, 3.0SP2, 4.0

SYMPTOMS

SNA Server Manager does not allow a single LUA Pool to be assigned to more than one TN3270 service in an SNA Server subdomain. This prevents multiple TN3270 servers from sharing a large pool of LUA sessions across more than one SNA Server computer, limiting flexibility in some fail-over configurations.

CAUSE

SNA Server Manager was not originally designed to allow a single LUA Pool to be assigned to more than one TN3270 server in an SNA Server subdomain.

STATUS

Microsoft has confirmed this to be a problem in Microsoft SNA Server version 3.0 (all service packs) and SNA Server 4.0.

A new feature that allows you to assign a single LUA pool to two TN3270 servers is now available, but due to the complexity of the configuration changes it has only been implemented in SNA Server 4.0. Customers using SNA Server 3.0 must first upgrade to SNA Server 4.0 and then request this enhancement from Microsoft. This feature has not been fully regression- tested and should be applied only to systems experiencing this specific problem. Unless you are severely impacted by this specific problem, Microsoft recommends that you wait for the next Service Pack that contains this fix. Contact Microsoft Technical Support for more information.

MORE INFORMATION

The following SNA Server 4.0 modules have been updated to support this new capability:

  <snaroot>\system\snaadmin.dll
  <snaroot>\system\snaole.dll
  <snaroot>\system\snacfg.exe

When an LUA Pool is assigned to a second TN3270 server, it inherits all the same properties (including Port number, IP addresses, and so on) that already exist for that LUA Pool. If any properties are modified on the Pool, then they are modified for all the TN3270 servers.

A new message is displayed when you try to assign a second instance of an LUA Pool to a TN3270 server. The message is: "Pool already assigned to this TN3270 Server."

The SNACFG.EXE command-line configuration utility has been updated to reflect this new capability. There is no new syntax. However, the "tn3session <name> /ADD" command is now allowed if the name matches an LUA Pool name and that pool is not already assigned to the TN3270 server. Entering the "tn3session /DELETE" command will delete the session from all the TN3270 servers that it is assigned to. Modifying a tn3session will cause all the sessions of that name to be modified in the same way. For this reason, the /TN3Server option is no longer valid for the modify operation.

The SNACFG.EXE file is also modified so that a TNIPID /LIST will now show all the TNIPID records. Entering "TNIPID <name> /ADD /SESSION:<tn3sess>" will add the record to all the TN3270 sessions with the same name. Entering TNIPID modify or /DELETE will operate on all the TNIPID records with the same name.

Keywords          : snamanager snatn3270
Version           : WINDOWS:3.0,3.0SP1,3.0SP2,4.0
Platform          : WINDOWS
Issue type        : kbbug
Solution Type     : kbfix