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Storage on the Clusters

Where is data stored

This storage is accessible from within the UNIL network using the SMB/CIFS protocol.

The UNIL HPC clusters also have dedicated storage that is shared amongst the compute nodes but this is not, in general, accessible outside of the clusters  except via file transfer protocols (scp).

This space is intended for active use by projects and is not a long term store.

Cluster filesystems

The cluster storage is based on the IBM Spectrum Scale (GFPS) parallel filesystem. There are two disk based filesystems (users and work) and one SSD based one (scratch). Whilst there is no backup the storage is reliable and resilient to disk failure. 

The role of each filesystem as well as details of the data retention policy is given below.

How much space am I using?

For the users and work filesystems the quotacheck command allows you to see the used and allocated space:

 

[ulambda@login ~]$ quotacheck 
### Work Quotas ###
 
Project: pi_ulambda_100111-pr-g 
 
                         Block Limits                                    |     File Limits
Filesystem type         blocks      quota      limit   in_doubt    grace |    files   quota    limit in_doubt    grace  Remarks
work       FILESET      304.6G     1.999T         2T          0     none |  1107904 9990000 10000000        0     none DCSR-DSS.dcsr.unil.ch
 
 
Project: gruyere_100666-pr-g 
 
                         Block Limits                                    |     File Limits
Filesystem type         blocks      quota      limit   in_doubt    grace |    files   quota    limit in_doubt    grace  Remarks
work       FILESET           0        99G       100G          0     none |        1  990000  1000000        0     none DCSR-DSS.dcsr.unil.ch

 
### User Quota ###
 
                         Block Limits                                    |     File Limits
Filesystem type         blocks      quota      limit   in_doubt    grace |    files   quota    limit in_doubt    grace  Remarks
users      USR          8.706G        50G        51G       160M     none |    66477  102400   103424      160     none DCSR-DSS.dcsr.unil.ch

Users

/users/<username>

This is your home directory and can be used for storing small amounts of data. The per user quota is 50 GB and 100,000 files.

There are daily snapshots kept for seven days in case of accidental file deletion. See here for more details. 

Work

/work/<path to my project>

This space is allocated per project and the quota can be increased on request by the PI as long as free space remains. 

This space is not backed up but there is no over-allocation of resources so we will never ask you to remove files.

Scratch

/scratch/<username>

The scratch space is for intermediate files and the results of computations. There is no quota and the space is not charged for. You should think of it as temporary storage for a few weeks while running calculations.

In case of limited space files will be automatically deleted to free up space. The current policy is that if the usage reached 90% files, starting with the oldest first, will be removed until the occupancy reached 70%. No files newer than two weeks old will be removed.removed.

$TMPDIR

For certain types of calculation it can be useful to use the NVMe drive on the compute node. This has a capacity of ~400 GB and can be accessed inside a batch job myby using the $TMPDIR variable.

At the end of the job this space is automatically purged.