RubySky Compute Cluster [Retired]

Notice: RubySky has been merged with SCC.

As part of the Shared Compute Cluster (SCC) transition, RubySky has been merged with SCC as “Buy-In” nodes for BUMC Researchers. These nodes are now available at no charge from the SCC4 login-node at no charge to BUMC research projects that existed prior to the move.


RubySky is LinGA’s newest computer cluster. Installed in 2012, this system added 1024 cores and 4.3 TB of RAM to the LinGA infrastructure–more cores and more ram than all previous clusters combined. The cluster structure and compute nodes have been updated resulting in some important operational differences from previous clusters, see the notes section for more information.


System Details


RubySky Monitoring
“module” information

System Details

  • One head node with two 16-core 2.3 GHz AMD Opteron processors and 128 GB of RAM
  • 16 blades with four 16-core 2.3 GHz AMD Opteron processors and 256 GB of RAM each (one has 512 GB of RAM)



This cluster functions differently than some of LinGA’s older clusters. Here are a few things to note:

The login-node

  • There is no need to “qlogin” or “qrsh” and you can work directly on the login-node.
  • You cannot change your password (“passwd”) or check accounting (“qacct”) from the login-node. See head-node.

The head-node:

  • The head-node for rubysky is called “yellow”.
  • Must ssh to “” to perform head-node tasks, such as “passwd” and “qacct”.

Use “modules” to set environmental variables, such as applications.

  • Applications are not loaded by default.
  • You may need to change your scripts to import specific modules.
  • See the module page for more info.