Control logic design to support USB cache offload

摘要

A redundant array of independent drives controller and board controlled cache off-loading during a power failure is described. Methods associated with the use of the redundant array of independent drives controller and board for controlled cache off-loading during a power failure are also described.

主权项

1. A method operable on a Redundant Array of Independent Drives (RAID) controller that is operable to communicatively couple to a host system through a Peripheral Component Interconnect Express (PCIe) connector, the method comprising:
monitoring a power supply from the PCIe connector to the RAID controller; identifying when a power failure from the power supply to the RAID controller has taken place; enabling an alternate power source for the RAID controller once the power failure is identified; identifying whether a cache offload is required from cache on the RAID controller to a non-volatile storage device at a time of the power failure; preparing the RAID controller for the cache offload during the power failure; off-loading the cache from the RAID controller during the power failure; determining whether the power supply from the PCIe connector to the RAID controller has been restored in response to completing the cache offload from the RAID controller; booting the RAID controller if the power supply has been restored; and disabling the alternate power source to power down the RAID controller if the power supply has not been restored.