Users are NOT supposed to run jobs from this filesystem because of the low performance. In fact the emphasis on the /users filesystem is reliability over performance: all home directories are backed up with GPFS snapshots and no cleaning policy is applied.
The $HOME environment variable points to the personal folder /users/<username>: please, keep in mind that you cannot exceed the 10 GB - 100 K files quota enforced on $HOME. To check your usage type the command quota on the front end Ela.
For more information, please contact us at help(at)cscs.ch.