Performance Impacts of Flash SSDs Upon IBM Power Systems

This paper examines the results of IBM® Power System™ storage I/O subsystem level testing performed to assess the impact of using NAND Flash based Solid State Drives (SSDs) in RAID configurations for traditional server applications.

Primitive workloads were used that stress the storage I/O subsystem to show boundary conditions of IBM Power subsystems with direct attached storage (DAS) connected NAND Flash based SSDs. Also, several workloads that simulate On-line-Transaction-Processing or “OLTP” applications are reported to show the impacts on subsystem throughput and response time for more complex workloads.

Test results show that IBM Power Systems have the I/O infrastructure to take advantage of SSDs. Also shown are rules of thumb that can be used to help properly size and tune storage I/O subsystems with SSDs for many applications running under any of the Power System supported operating systems.

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