Hardware

Clusters

Minotaur

• 38 nodes, each containing two 4-core processors (304 cores total). 8 GB memory per node.
  Processor type: Intel Xeon E5472, 3.0 GHz.
• Jobs are scheduled via Torque/Maui. Notes on using Torque.

Hydra

• 60 nodes, each containing two 6-core processors (720 cores total). 12 GB memory per node.
  8 nodes (queue "fast", nodes h001-h008) have Intel Xeon X5690 3.47 GHz processors.
  52 nodes (queue "default", nodes h009-h060) have Intel Xeon E5645 2.40 GHz processors.
• Jobs are scheduled via Torque/Maui. Notes on using Torque.

Disk space, backups, and RAID storage

Disk space allocations

Each user has a home directory located on ariadne. This home directory is exported to all desktop machines, so that you see the same home filesystem on each machine. The drive is protected against hardware failure via a RAID-1 setup. Furthermore, each night all new or modified files on /home are written to tape (located in ariadne). This makes it important not to store temporary data in your home folder, as it would quickly fill up the tape. Since users tend to forget this, a quota system has now been enabled on ariadne, restricting each user to 15 GB. To check how much space you are using log on to ariadne and issue the command

quota -s

In addition, each user has significant additional storage on the scratch partitions. These are located in the different desktop machines and protected via RAID-1, but backups are your own responsibility. Note that these partitions are generally only mounted on the desktop machine that contains the drive. If you need a partition to be exported to a different machine, please ask.