What physical infrastructure is Elastichosts based on?

The virtualisation hosts in lon-p and sat-p have dual quad-core Xeon E5420s at 2.5GHz with 32GB of RAM and 4-6x 0.75-2TB drives each. The virtualisation hosts in lon-b have dual quad-core Opteron 2352/2378s at 2.1/2.5GHz with 32GB of RAM and 2-3x 1-2TB drives each. They run our in-house cloud hosting platform, which is built on open source technologies including Linux, qemu-kvm, LVM and iSCSI. The disks are arranged into RAID 1 pairs, and virtual disks are allocated out of this pool of RAID 1 arrays.