Policy: scratch space

PLEASE NOTE: The new Lustre scratch filesystem is now available for use at /n/scratchlfs. Please move any needed data from Regal to ScratchLFS.

NOTE: Regal was decommissioned on May 6th, 2019.

See: Transferring data on the cluster Please pay close attention to notes on timestamps as the 90-day policy still applies to ScratchLFS.


RC maintains a large, shared temporary scratch filesystem for general use for high input/output jobs at /n/scratchlfs. This workspace is made available with the provision that each group use no more than 50TB, and that files older than 90 days will be deleted through a periodic purge process. This purge can run at any time, especially if scratch is getting full (df -h /n/scratchlfs to see current total use) and is also run at the start of the month during our maintenance period.

There is no charge for scratch, but please note that it intended as volatile, temporary scratch space intended for transient data and is not backed up. If your lab group needs a directory in scratch, please contact us.

Modifying file times (via touch or other process) to avoid retention is an abuse of the filesystem and will result in administrative action from RC.  You may initially modify the file date(s) on new data so that it is not in the past, but should not modify it further. These actions may include deleting data on scratchlfs owned by the offender and disabling the offending account.  If data on scratch needs to be kept longer, please contact us to discuss options.


To view your group's scratch quota and usage:
lfs quota -hg lab_name /n/scratchlfs


CC BY-NC-SA 4.0 This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License. Permissions beyond the scope of this license may be available at Attribution.