LoBoS 5

With the unreliability of the motherboards in LoBoS 4, the Computational Biophysics Section staff decided to switch back to Intel CPUs with Supermicro motherboards. As the Pentium 4 processor was not designed for multiprocessor operations, LoBoS 5 nodes were delivered with dual Intel Xeon processors. Approval for the cluster was granted in June, 2003 and LoBoS 5 was installed in stages between March and December of 2004. The first batch of 88 nodes were equipped with 2.66 GHz Xeons. All subsequent nodes have dual 3.06 GHz processors.

With 190 nodes now in operation, the LoBoS cluster has reached the limits of the physical space available to it on campus. A new, off-campus computer room has been constructed and work is underway to build out LoBoS 6.

Equipment	Notes
190 compute nodes	SuperMicro motherboard CPU: 88 nodes: Dual 2.66 GHz Xeon 512 KB L2 cache 102 nodes: Dual 3.06 GHz Xeon 512 KB L2 cache 2048 MB PC-2100 DDR SDRAM and 1024 MB of swap space 120 GB 7200 RPM EIDE hard drive Onboard gigabit ethernet network interface card Myrinet Interface: 88 nodes: Myrinet E-card fiber network interface card 40 nodes: No Myrinet connectivity 62 nodes: Myrinet C-card fiber network interface card from LoBoS 4
2 master nodes	SuperMicro X5DPA motherboard Dual 2.8 GHz Intel Xeon CPUs with 512 KB L2 cache 2 x 120 GB EIDE hard drives in a RAID1 (mirroring) configuration 4.8 TB RAID storage from EonStor equipped file servers (available throughout the LoBoS network).
Myrinet switching hardware	The Myrinet switching hardware from LoBoS 4 was retained. In addition, a second, identical switch and line cards were added.

LoBoS 5 nodes.