Hardware of LEO II
This web site provides some hardware details of the main cluster components.
Cluster
The whole cluster consists of three racks:
- Two iDataplex racks with water-cooled heat exchanging
doors
Front view - closed doors Front view - opened doors 
-
One 19'' infrastructure rack for network and storage
devices
Front view Back view
Computing nodes
- 126 compute nodes each of which consists of:
- 2 Intel Quad-Core L5420 CPUs (8 cores running on 2.5 GHz)
- 32 GB DDR2 RAM (4 GB per core)
- Single-Port 4x DDR Infiniband PCIe x8 HCA
- 2 x 1Gb Ethernet adapter
- 250 GB SATA2 hard disk
'Inner life' of one node Closeup view of some rack mounted nodes - One master server for login and job submission
- 2 Intel Quad-Core L5420 CPUs
- 16 GB DDR2 RAM
- Raid controller (configured with RAID 1)
- 2 146GB 15k 3.5'' Hot-Swap SAS hard disks
- Single-Port 4x DDR Infiniband PCIe x8 HCA
- 4 x 1Gb Ethernet adapter
Network devices
- Infiniband
- QLogic 144-Port DDR 4x Infiniband Switch
- 2 DDR Spine Modules - managed / 1 DDR Spine Module - unmanaged
- 11 DDR 4x IB Switch Leaf Modules
- 132 DDR 4x IB Ports
Front view - Gigabit-Ethernet
- 3 48-Port 1 Gb Ethernet Switches
- 2 SFB Modules (fiber optic uplinks to university LAN)
Back view
Storage system
The storage system offers a total of 43 TB (brutto) and consists of:
- two disk systems:
- 2 FC-SAS, dual storage controllers (2 controller enclosures)
- 6 SAS JBODs and Environment Service Modules (6 SAS enclosures)
- 96 450GB 15k 3.5'' SAS disks
Front view - two redundant file servers with the following configuration:
- 2 Intel Quad-Core L5420 CPUs
- 32 GB DDR2 RAM
- Raid controller (configured with RAID 10)
- 4 146GB 15k 3.5'' Hot-Swap SAS hard disks
- Single-Port 4x DDR Infiniband PCIe x8 HCA
- 6 x 1Gb Ethernet adapter
Water Cooling System
Due to the high discharge of thermal energy the iDataplex Racks are installed with water-cooled heat exchanging doors. The water flow temperature is kept at 16 degrees celsius by the heat exchanging device (Cooltrans).
- Water Cooling System:
Cooltrans, the heat exchanging device
Photos: Wolfgang Kapferer