OMV980I SESSION REQUEST FAILED FOR cccccccc/aaaaaaaa - INSUFFICIENT MEMORY
Explanation
OBVTAM (application cccccccc) failed to obtain enough memory to establish a session with terminal aaaaaaaa.
System action
OBVTAM rejects the session request from terminal aaaaaaaa.
User response
It may be possible to start a session by using a terminal with a smaller screen size, or by eliminating the use of 3270 data stream compression. Specify DC=N as part of the OBVTAM startup parameter to eliminate data compression. If the session still cannot be started, it may be necessary to increase the value of the z/OS® REGION SIZE to make more memory available to OBVTAM.