Monday, February 23, 2015

Flux and Value Storage outage March 28th 10:00pm

The ARC cluster Flux and Engineering cluster Nyx will be unavailable for jobs March 28th at 10:00pm. There is an emergency update to the ITS Value Storage systems on that date.

Flux and Nyx rely on Value Storage and thus will also not be available during that time.  We expect the outage to be finished quickly and any queued jobs will run as expected once the service is completed.

At the start of the outage, login and transfer nodes will be rebooted.  Users will be unable to login until after the service is restored.

Any jobs that request more walltime than remains until the start of the outage will be held and started after the systems return to service.

To find the maximum walltime you can request and have your job start
prior to the outage can be found with our walltime calculator.

module load flux-utilsmaxwalltime

Allocations that are active on that date will be extended by one day
at no cost

If you have any questions feel free to ask us at
For immediate updates watch:

Wednesday, February 11, 2015

Data will be deleted from /scratch on Flux if unused for 90 days

Over the past several months, a huge amount of data (491 TB) has accumulated in the /scratch directory on the Flux computing cluster. /scratch is meant for data relating to currently running jobs, and the buildup of data is threatening the performance of Flux for all users.
Therefore, ARC will begin deleting data from /scratch that have not been accessed for 90 consecutive days.

Flux account owners with unused data have begun receiving emails warning that their data will be deleted.

Account owners in this situation can move their data to another system such as ITS Value Storage or their own equipment using the dedicated transfer nodes on Flux with high speed network connectsion available for that purpose.

For more information on Value Storage, see the ITS website.
For more information on transfer nodes, see the ARC website.
If you have any questions, please contact