This compute cluster is restricted to Dr. Fang’s students. It is available over ssh to infolab.ece.udel.edu. The cluster was upgraded in August 2011. The headnode is now a 16 core Penguin Altus 1800. Six of the seven compute nodes (nodes 1-6) are eight core Sun Fire X2200s while the other node (node0) is an eight core Penguin Altus 1750.

During the upgrade some disks were removed (BLOGS08, node5:/local/infolab), others moved around (the old head node became node 6, node3:/local/infolab3 was moved to node0:/local/infolab0) and others added.

Parallel jobs may be written using MPI which is installed at /usr/local/mpich. Slurm is also installed at /usr/local/slurm and the cluster is configured so jobs can be submitted with it. For more info on slurm please see https://computing.llnl.gov/linux/slurm/

The headnode and node0 have four disks installed while the rest of the nodes have both of their slots filled. There are several data filesystems spread throughout the cluster and they can be automatically mounted over NFS through the /infolab automount point. The following is a table of all the available data filesytems in the infolab cluster.

node	        filesystem	      NFS
---------       -----------------     -------------------
headnode        /export/home          /usa/{USER}             
headnode        /local/data           /infolab/headnode       
headnode        /local/infolab        /infolab/infolab        
headnode        /local/CLUEWEB09_1    /infolab/CLUEWEB09_1    
headnode        /local/CLUEWEB09_2    /infolab/CLUEWEB09_2    
node0           /local/data           /infolab/node0          
node0           /local/infolab0       /infolab/infolab0       
node0           /local/CLUEWEB09_3    /infolab/CLUEWEB09_3    
node0           /local/CLUEWEB09_4    /infolab/CLUEWEB09_4    
node1           /local/data           /infolab/node1          
node1           /local/infolab1       /infolab/infolab1       
node2           /local/data           /infolab/node2          
node2           /local/infolab2       /infolab/infolab2       
node3           /local/data           /infolab/node3          
node3           /local/infolab3       /infolab/infolab3       
node4           /local/data           /infolab/node4          
node4           /local/infolab4       /infolab/infolab4       
node5           /local/data           /infolab/node5          
node5           /local/infolab5       /infolab/infolab5       
node6           /local/data           /infolab/node6          
node6           /local/infolab6       /infolab/infolab6       

Additionally, there is a reliable filesystem from an ECE/CIS storage server available at /m/infolab/. It is protected with double parity, is backed up and has ZFS snapshots available. This should be used to store important data that you do not want to lose for example.

These filesystems are writable to users in the infolab group. Only Dr. Fang may request users be added to the infolab group. The CLUEWEB disks are read only.

The size, used space and available space can be obtained for a filesystem using the «df -h .» command while working in that filesystem.

The home directories can be used to store some important data. They are mirrored on two disks for reliability and are also backed up. That filesystem is rather small though. The other filesystems are just on a single disk (that could fail at any time) and are not backed up. Obviously no important data that can’t be recovered from elsewhere should be stored on those filesystems.