Facilities > ALMA/NAASC > Documentation > Manuals > Computing Resources > Resource Limits and Data Retention

Resource Limits and Data Retention

by K Scott Rowe last modified Feb 03, 2016 by Patrick Murphy
Contributors: jrobnett, ebryer, mhatz, pmurphy
Allocation and limits on processing resources applies to both NRAO staff and observers.


Users are limited to 3TB of space on the shared Lustre filesystem and up to 2 compute nodes. For interactive sessions nodes are assigned for 1 to 14 days.  The default access duration is 1 week with a 2 week maximum.

Compute nodes reserved for interactive use can only be accessed by the reserving account.

During periods of increased pressure users may be asked to reduce usage to one node to allow broader community access.

Requests for increased access duration, storage space and compute nodes should be submitted as a ticket to https://help.almascience.org/ (Data Reduction [NA] department) and will be reviewed by designated NAASC staff on a case by case basis.


Reports on Lustre space usage is calculated periodically:


Data Retention

External accounts, along with any data products, will be removed two weeks from the completion of a processing request.    For interactive sessions the account and data products will be removed two weeks from the end of the session.  You will receive an email warning prior to accounts deletion.  In the event of multiple processing requests the account expiration date will be triggered by the last request to complete.

Large Proposals

Observers associated with large proposals (greater than 200 hours) who plan to use NRAO computing resources are encouraged to request the creation of a project area on the Lustre filesystems and a Unix group for shared data access among proposal members.

Project area size limits will be negotiated with NRAO at the time of the request to match project data rates and imaging plans but will typically be 10TB to 20TB in size.

Large proposals may request a block of compute nodes accessible by anyone in the group.  Typically this would be 2 to 4 nodes reserved for two to four months at a time.