Each Metropolis user has access to three disk areas that can be used for processing data. Each area, is intended to be used as follows*:
| Directory | Intended use | Storage time | Backup | Default quota/user |
|---|---|---|---|---|
| $HOME (a.k.a /home/$USER) | Initialization scripts, source codes, small data files, long term data. Not for running programs or research data. | Permanent | Yes | 25 GB |
| $TMPDIR (a.k.a /tmp on each node) | Limited, temporary storage (filesystem in RAM) | Temporary | No | None |
| /scratch | For running programs or processing research data. | Permanent | No | 100 GB |
The directories listed in the table above can be accessed through the Linux command line. Apart from /tmp, home and /scratch filesystems are built on top of redundant arrays to provide maximum reliability. The /scratch filesystem relies on a parallel storage with Lustre and provides the best performance for handling large data sets or large number of data files.
*Under review
