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Cambridge Service for Data Driven Discovery

University of Cambridge

Studying at Cambridge


Storage Policies

User space is limited on the home directory filesystem (/home) to 40 GB per user.

This is provided by ZFS over NFS and hourly/daily/weekly snapshots are made automatically which can be searched by the user. E.g. if you delete a file by accident look in


and browse the best snapshot for the file (which can be copied back to your home directory).

The working/scratch storage allocated to users is provided by our Cambridge Research Data Storage (RDS) service.  Within your home folder you will see a symlink called rds and within this is a hpc-work directory.  Currently there is a 1TB quota imposed by default per user on scratch but we reserve the right to change that policy at any time.

Please note that it is already possible to buy additional, larger RDS areas via our self-service gateway, these are also visible on Peta4 under the ~/rds directory.

The RDS filesystem is not backed up and its primary use is for data processing. Any critical data should be backed up by other means. 

The amount of space currently being used can be seen via the command quota:

[sjr20@login-e-7 ~]$ quota
Filesystem GiBytes quota limit grace files quota limit grace User/group
/home 33.0 40.0 40.0 - 0 0 0 - U:sjr20
/rds-d1 0.2 1024.0 1126.4 - 1017 524288 524288 - G:sjr20
/rds-d2 0.2 0.0 0.0 - 166 0 0 - G:sjr20
/rds-d2 10.9 10240.0 10240.0 - 21324 5242880 5242880 - G:rds-hpc

Note that this command will only provide information about the user who invokes it.