Event 3 May Indicate Excessive APPC LU Partnerships

 Last reviewed: July 25, 1996
Article ID: Q150628
The information in this article applies to:
  • Microsoft SNA Server for Windows NT, versions 2.0, 2.1, 2.11, and 2.11 Service Pack 1

SYMPTOMS

If you define too many LU-LU partnerships, SNA Server will run out of Internal Mode Control Blocks. You may get the following Dr. Watson error message in SNA Server: 

   80000003 (hardcoded breakpoint).
In addition, the following Event 3 will be logged in the Application Event log: 

   Event ID: 3 (1102) Node Configuration Error
   EXPLANATION:
   The SNA server (node) detected a configuration file problem caused by a
   logic error in the configuration program. These subcodes should not
   occur during normal operation.

CAUSE

Each LU-LU partnership requires one Internal Mode Control Block (IMCB), and an additional IMCB is reserved if the LU is defined for parallel sessions. The limit is 4096 Internal Mode Control Blocks per SNA Server.

For example, a configuration with 240 connections (each with 1 LU defined) and a node with 10 local LUs (each partnered with every remote LU) will result in the use of 2400 Mode control blocks. In addition, if the LUs support parallel sessions, each is implicitly partnered with the SNASVCMG mode for CNOS, taking up another 2400 control blocks, for a total of 4800 control blocks. Therefore, the node reports the error and terminates.

WORKAROUND

Reduce the number of LOCAL LUs configured. Each local LU that is removed saves 2*partner LU Mode control blocks.

KBCategory: kbenv
KBSubcategory: snaconfig
Additional reference words: 2.00 2.11 2.11.sp1

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Last reviewed: July 25, 1996
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