The cache consists of a high-speed object database called the object store. The object store indexes objects according to URLs and associated headers, enabling Websense Content Gateway to store, retrieve, and serve Web pages and parts of Web pages, providing optimum bandwidth savings. Using object management, the object store can cache alternate versions of the same object, varying on language or encoding type, and can store small and large documents, minimizing wasted space. When the cache is full, Content Gateway removes stale data.
Fault tolerance: Content Gateway can tolerate disk failures on cache disks. If a disk drive fails five successive I/O operations, Content Gateway marks the disk as down, removes the drive from the cache, and sends an alarm message to the Content Gateway manager, indicating which disk failed. Normal cache operation continues on the remaining cache disks. If all cache disks fail, Content Gateway goes into proxy-only mode.
