In addition, PrimoCache implements the Unified Invisible Memory Management Interface (UIMMI), which can use Invisible Memory as level-1 cache. Therefore write requests can be responded and completed very fast, greatly improving the disk write performance. PrimoCache also supports write-deferred caching mode, which executes write requests on the cache first and synchronizes data from the cache to the disk after custom delays. Thus level-2 cache will remarkably reduce boot-up time and speed up applications for those computers which install mechanical hard disks. This avoids fetching often-accessed data again from slow disks each time computer boots up. Unlike level-1 cache which cannot keep cache contents on reboot, level-2 cache is able to retain its cache contents across computer reboots because of the persistent nature of storage devices. PrimoCache allows a single level cache configuration using either level-1 cache or level-2 cache, as well as a two-level cache configuration using both levels of cache. Obviously level-1 cache runs much faster than level-2 cache, although it is usually much smaller. Level-2 cache is a secondary cache which typically resides on a solid-state drive, a flash drive or other fast persistent storage device. Level-1 cache, also called primary cache, is composed of physical memory. PrimoCache implements a two-level caching architecture consisting of level-1 cache and level-2 cache.
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