An architectural framework for software recovery of hardware faults

Download [PDF ] [PPT ] Abstract As technology scales ever further, device unreliability is creatingexcessive complexity for hardware to maintain the illusion of perfectoperation. In this paper, we consider whether exposing hardware fault information to software and allowing software to control fault recovery simplifies hardware design and helps technology scaling. The combination of emerging applications and emerging many-core architectures makes software recovery a viable alternative to hardware-based fault recovery.

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In this paper, we consider whether exposing hardware fault information to software and allowing software to control fault recovery simplifies hardware design and helps technology scaling. The combination of emerging applications and emerging many-core architectures makes software recovery a viable alternative to hardware-based fault recovery. To ensure an application is resilient to end-to-end failures, it is essential that all fault-points and fault-modes are understood and operationalized.

To learn more, see Failure mode analysis for Azure applications. Eliminate all single point of failure. A single point of failure describes a specific fault-point which if it where to fail, would bring down the entire application. Single points of failure introduce significant risk since any failure of this component will cause an application outage. To learn more, see Make all things redundant. Eliminate all singletons. A singleton describes a logical component within an application for which there can only be a single instance.

It can apply to stateful architectural components or application code constructs. Ultimately, singletons introduce a significant risk by creating single points of failure within the application design. Internal dependencies describe components within the application scope which are required for the application to fully operate. External dependencies capture required components outside the scope of the application, such as another application or third-party service.

Dependencies may be categorized as either strong or weak based on whether or not the application is able to continue operating in a degraded fashion in their absence.