Océano is a prototype of a highly available, scaleable, and manageable infrastructure for an e-business computing utility. It enables multi-enterprise hosting on a collection of shared resources (eg., servers). However, at any point of time, each resource is assigned for use by only a single customer. That is, the hosting environment is divided into smaller, secure domains, each supporting one customer. These domains are dynamic: the resources assigned to them may be augmented when load increases and reduced when load dips. This dynamic resource allocation enables flexible Service Level Agreements (SLAs) with customers in an environment where peak loads are an order of magnitude greater than the normal steady state.