Samsung Electronics has acquired Proximal Data, a developer of software that caches I/O in the server virtualization layer, to boost its SSD offering in the server market. The financial terms of the deal were not disclosed. Proximal in San Diego, California, offers AutoCache, which attaches inside standard hypervisors such as VMware ESXi, where it inspects I/O from all virtual machines and places hot I/O into a local PCIe flash card or SSD.