DM-7

 DM cube is a scalable cluster of high-performance COTS processors with a high-speed interconnect with operation under the control of a reliable, radiation-hardened system controller and platform and application-independent fault-tolerant middleware. DM Cube takes advantage of the availability of small, lightweight, low-power, COTS Computer-on-Module Gumstix™ technologies allowing significant reductions in size, weight, and power consumption while increasing processing performance. DM has the following features:

• Based on small, light-weight, low-power, low-cost, Gumstix™ COM (Computer-On-Module)-based, high-performance onboard payload processing--1600 DMIPS, 5.6 grams, ~ 2 watts
• Operated under the control of a reliable system controller
• Platform and application-independent
• Highly scalable (to >24 processors)
• Requires low overhead (<10% throughput & memory)
• Extremely flexible--user-configurable fault tolerance includes hybrid replication, temporal and spatial self-checking and Triple Modular Redundancy for critical functions and Algorithm-Based Fault Tolerance
• Peak throughput density of 300 million (MOPS)/watt
• Optional fault-tolerant DM Middleware (DMM)

Middleware (Honeywell International)

DM software is an architecture and software framework that enables COTS-based, high-performance, scalable cluster processing systems to operate in inhospitable environments by providing software-based SEE-tolerance enhancement. DM is available with user-configurable fault-tolerant options spanning the mission level to the application level. Fault-tolerant execution includes replication, i.e., temporal and spatial self-checking (SC) and triple modular redundancy (TMR), combined with more computationally efficient Algorithm-Based Fault Tolerance (ABFT). DM can execute multiple missions sequentially or concurrently based on resource availability. A predicted 5-year probability of incorrect computation less than or equal to 0.005 in a Low Earth Orbit (LEO) environment is possible.

DM-7 Flight Validation Experiment

DM-7 (NASA Technology Readiness Level-7) experiment will be installed on the NanoRacks Exterior Platform (NREP) on the International Space Station to test DM in the space radiation environment. DM-7 launched on HVT-6 from Japan on December 9, 2016, and has operated successfully in orbit.