We have an client on MVS O/E wich worked fine till last weekend (there was an upgrade of the MVS (2.10 -> Z/OS 1.1) and now the client can do everyting but backup or archive. All Query's and restores work. The client hang's (when incremental, selective or archive are started) and on the server you see the session is in IDLEW wich keeps augmenting till the max is reached. As far as i was abel to determine the functions that start an extra session are the ones's that don't work. As putting resourceutilization to 1 doesn't help i will have to try to find what in unix is blokking the creation of this second proces. Since i am more an MVS than a UNIX guy i am a bit at a loss where to start looking. It must be a UNIX configuration issue since on an other MVS O/E partition everything works fine with the same parameters for TSM, only the load on that machine is different.