System and method for ensuring command order in a storage controller
Abstract:
A novel storage router with an acceleration gate is disclosed. The storage router includes one or more network interfaces for receiving storage traffic and a hardware engine for processing data storage commands. The hardware engine transfers commands and data to target storage devices by means of more than one storage interface, the storage interfaces having unequal processing latencies. The hardware engine contains an acceleration gate for storing the number of outstanding commands to each storage interface on a per-target-device basis. If the target device is not idle, the hardware engine uses the acceleration gate count to automatically route commands to the lowest latency path with outstanding commands for the target device.
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