April 3, 201610 yr Are there any benefits having SGPIO? Does unRAID uses SGPIO? Serial General Purpose Input/Output (SGPIO) is a four-signal (or four-wire) bus used between a host bus adapter (HBA) and a backplane. Of the four signals, three are driven by the HBA and one by the backplane. Typically, the HBA is a storage controller located inside a server, desktop, rack or workstation computer that interfaces with hard disk drives (HDDs) to store and retrieve data. It is considered an extension of the general-purpose input/output (GPIO) concept. A backplane is a circuit board with connectors and power circuitry into which hard drives are attached; they can have multiple slots, each of which can be populated with a hard drive. Typically the backplane is equipped with LEDs which by their colour and activity, indicate the slot's status; typically, a slot's LED will emit a particular colour or blink pattern to indicate its current status.
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