This section explains what happens when line, adapter, or modem outages occur and how to help prevent them.
Line, adapter, or modem outages result in error messages at the SNA console and at the DirectConnect for z/OS Option. The DirectConnect for z/OS Option records the message and, when possible, sends a similar error message to any affected clients.
Intermittent hardware errors and line degradation problems disrupt processing and may be difficult to find. It helps to check periodically for these problems. For example:
To check for hardware errors, use the SNA error logs. Report errors to IBM Service.
To check for line degradation, use SNA to periodically report the SDLC line statistics. Examine the statistics for a significant number of re-transmissions or idle detect timeouts. Line degradation results in random SDLC line failures or very slow response to the client, even during a moderate processing load.
