I have just upgraded my server from 2gig of memory to 4 gig using fresh memory. I started having abends at different times under different modules. I also have a log entry stating to Increase the logical space by restarting theserver with the -U671252480 switch. I found a TID and I checked the health of the server and memory. I went to tune logical address space and it said no changes were needed at this time. The server abended anyway.
Is there a need to adust the memory usage in the OS when upgrading the memory? If so, could someone give me guidence on this issue. I had to take out the 4 gig and go back to my old 2gig to get it stable

Thank You very much.