When running a large program on a MVAX II under Ultrix 3.0, I get "panic: IO error in push" quite consistantly. What is the problem ? Cheers, Dan Ts'o 212-570-7671 Dept. Neurobiology dan at rna.rockefeller.edu Rockefeller Univ. rna!dan at nyu.edu 1230 York Ave. tso at rockvax.bitnet NY, NY 10021