What are the conditions for temporary data?
For temporary user data it is recommeded to use $WORK instead of /tmp, because $WORK is a lot bigger.
Do not use /tmp!
/tmp is very small (about 1 GB) and only available for programs runing on the Front-End-Nodes. Data will be held only for 7 days.
Programs started with mpirun on a BlueGene partition are not able to access /tmp. Jobs trying this will be terminated.