Home directories Currently each user has 1 GB in home directory (/home/<username>). Long-term Group storage Each group has a directory shared by all members of the group (and only that group). These directories are links under the directory /work. To find yours, issue the groups command. The first group listed is your primnary group. E.g. For user jjc, groups shows ccresearch users. This means that /work/ccresearch is available on all nodes and jjc can create files there using the ccresearch group's quota. group quota for this space is based on the shares for the group and can be seen using quota -gs. Temporary local storage One can use the storage on the disk drive on each of the compute nodes by reading and writing to $TMPDIR (about 4 TB). This is temporary storage that can be used only during the execution of your program. Only processors executing on a node have access to this disk drive. Since 16 processors share this same storage, you must include the rank of the executing MPI processes when reading and writing files to $TMPDIR. Submitting MPI job When submitting an MPI job make sure that the executable resides in one of the shared locations: /home/<user> (where <user> is your user name) /work/<group> (where <group> is your group name) All these locations are mounted on each of the compute nodes.