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The filesystems available are HOME, PERM, HPCPERM and SCRATCH. While HOME and PERM are shared with the Linux VDI service, SCRATCH remains only accessible locallyHPC. Filesystems from other ECMWF platforms in Reading such as ECGATE, Linux Clusters, Workstations or the Cray HPCF are not cross-mounted. This means that if you need to use data from another ECMWF platform such as ECGATE or the Cray HPCF, you will need to so transfer it first using scp or rsync. See Linux Virtual Desktop VDI: File transfers for more information. |
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The filesystems available are HOME, PERM, HPCPERM and SCRATCH, and are completely isolated from those in other ECMWF platforms in Reading such as ECGATE or the Cray HPCF. Filesystems from those platforms are not cross-mounted either. This means that if you need to use data from another ECMWF platform such as ECGATE or the Cray HPCF, you will need to so transfer it first using scp or rsync. See Linux Virtual Desktop VDI: File transfers for more information. |
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File System | Suitable for ... | Technology | Features | Quota |
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| HOME | permanent files, e. g. .profile, utilities, sources, libraries, etc. | NFS | It is backed up. Limited I/O performance | 20GB |
| PERM | permanent files without the need for automated backups, smaller input files for serial or small processing, std output, etc. | NFS | It is backed up. Limited I/O performance | 20GB |
| HPCPERM | permanent files without the need for automated backups, bigger input files for parallel model runs, climate files, etc. | NFS | No Backup No automatic deletion | 1TB |
| SCRATCH | all temporary (large) files. Main storage for your jobs and experiments input and output files. | Lustre | Automatic deletion to be configured at a later stage No backup | 4TB |
SCRATCHDIR | Big temporary data for an individual session or job, not as fast as TMPDIR but higher capacity. Files accessible from all cluster. | Lustre | Deleted at the end of session or job Created per session/ job as a subdirectory in SCRATCH | part of SCRATCH quota | TMPDIR | Fast temporary data for an individual session or job, small files only. Local to every node. | SSD on shared nodes | 3 GB per session/job |
RAM on exclusive compute nodes | no limit (maximum memory of the node) | |||
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Those filesystems can be conveniently referenced from your session and scripts using the environment variables of the same name: $HOME, $PERM, $HPCPERM, $SCRATCH, $SCRATCHDIR and $TMPDIR. $TEMP, which in the past was an alias to $SCRATCH, has been deprecated and is no longer defined. Please use $SCRATCH instead |
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| Before | After |
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| /home/group/user or /home/ms/group/user | /home/user |
| /perm/group/user or /perm/ms/group/user | /perm/user |
| - | /hpcperm/user |
| /scratch/group/user or /scratch/ms/group/user | /scratch/user |
Special directories on RAM
On TEMS, some special directories are not disk-based but actually mapped into the node's main memory. While there are no limits set on exclusive nodes (when running On shared nodes, this could lead to a single application or user consuming a great portion of the total memory available or filling up the existing limits and impacting others. This is why the following limits are set:
| Directory | New size/limit |
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| /tmp | 64 MB per user |
| /var/tmp | 64 MB per user |
| / | shm1 GB per user |
| $XDG_RUNTIME_DIR | 64 MB per user |
Users should instead use the general purpose file systems available, and in particular, $TMPDIR or $SCRATCHDIR for temporary storage per session or job. See 188033982.
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