The National Institute for Computational Sciences

Kraken Decommission FAQs

1. Why was Kraken retired?
A. The funding for the Kraken supercomputer ended on April 30th, 2014. As a result of this, Kraken was shut down and brought back up in a limited state to allow access to HPSS and /lustre/scratch data. This limited state ended on August 27, 2014.


2. What happened to my HPSS data?
A. Data residing on HPSS is accessible only via Darter or Nautilus.


3. What happened to my /lustre/scratch data?
A. The media holding this data was taken out of service and scrubbed, permanently deleting all data that resided on these drives. Data on /lustre/medusa remains until it is subject to purge under the NICS data purging policy.


4. What are the recommended ways of transferring data from HPSS?
A. All useful data should be transferred from HPSS to /lustre/medusa and moved using commonly available tools and transfer mechanisms. A recommended transfer utility depends on the utilities available at the destination institution. For all XSEDE institutions, users should be encouraged to use gridftp and/or Globus Online file transfer mechanisms. A list of file transfer utilities that are available on Kraken is located at


5. What happened to my Director Discretionary Kraken allocation(s)?
A. PI's can request a new allocation on other NICS resources at


6. What should I do with my NICS token if no longer needed?
A.  Users should hold on to their token if they need access to HPSS or other NICS systems. Otherwise please return the token to:
    National Institute for Computational Sciences
    Attn: Accounts
    Oak Ridge National Laboratory
    P.O. Box 2008, One Bethel Valley Road
    Oak Ridge, TN 37831-6173​

For more information on Kraken's History and Infrastructure, click here.

For a broad, by-the-numbers picture of the Kraken supercomputer's contribution to open scientific research, view the infographic.