The Flux HPC ClusterThe Lighthouse cluster supports researchers with grants that require the purchase of computing hardware. Lighthouse allows researchers to place their own hardware within the ARC HPC Slurm environment. This is a dedicated HPC cluster which provides the same capability as the Flux Operating Environment (FOE) did as a part of Flux.

To use Lighthouse, we suggest researchers:

  1. Coordinate with ARC prior to including hardware in a proposal or purchasing hardware;
  2. Purchase hardware that is compatible with the rest of the Lighthouse installation;
  3. Obtain a subscription to Lighthouse for each compute node.

A subscription to Lighthouse provides access to the ARC HPC infrastructure—data center, staff, networking, storage and basic software—except the compute hardware.

Lighthouse is available for:

  1. Researchers who receive funds from external funding agencies for purchasing equipment.
  2. Researchers who have workflow and/or infrastructure needs that differ significantly from those that can be met by other ARC services (i.e., Great Lakes or Armis2).

The hardware added to Lighthouse is for the exclusive use of the research group that added it and will not be part of the general the Great Lakes cluster allocation pool. (Lighthouse gives research groups the option of operating with access to commercially available software to be determined at the time of installation.)

Budgeting for Lighthouse

The Lighthouse subscription rate and node purchase charges allow for funding from a range of sources: federally funded research projects; general funds; departmental instructional funds; faculty discretionary and research incentive accounts; cost-sharing funds; and faculty start-up or retention package funds. All Lighthouse purchase and subscription costs are charged to a U-M Shortcode; no other payment method (cash, credit cards, etc.) is accepted. The costs are determined by the rate that applies to the purchasing researcher and the number and price of the compute nodes being added. Lighthouse use is billed monthly. The details of the Lighthouse charges will appear on the normal monthly Statement of Activity.

Hardware purchases for Lighthouse are a one-time expense. If made from federal funds, the timing of the purchase relative to the end of the grant period must be consistent with federal regulations. Lighthouse subscription charges are a recurring expense; you can see the Lighthouse rates here. If made from federal funds, subscription charges can not be prepaid to extend beyond the end of the grant period.

Using Lighthouse

Slurm commands will be needed to submit jobs. The Lighthouse User Guide explains Slurm usage on the cluster. For a comparison of Slurm and Torque commands, see our Torque to Slurm migration page.

No PHI or sensitive data may be stored or processed on Lighthouse. If you need access to a cluster appropriate for this data, see Armis2. For more policies and user responsibilities, see the Lighthouse User Guide.

Getting Access

Principal Investigators: Email before including hardware in a proposal or purchasing hardware. Once a plan is in place, you will work with support to get a subscription to Lighthouse for each node.

All Lighthouse users must be authorized first by their PI or a user authorized to make changes to the account. Requests can be sent to

Fill out the Lighthouse user form to get a login. To login, SSH to

For technical support, email

Additional Information on Using Lighthouse

Order Service

Principal Investigators: Email before including hardware in a proposal or purchasing hardware.  Once a plan is in place, you will work with support to get a subscription to Lighthouse for each node.

You also need a Lighthouse user login to access your nodes.

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