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DiskSim – Storage System Simulator Michigan-CMU

Explore request flow through storage components, model latencies, compare scheduling algorithms, vary cache sizes, and simulate workload impact. DiskSim is an accurate and versatile open-source tool written in C, supporting external trace requests and synthetic workloads. It allows for in-depth analysis of disk characteristics and driver performance.

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DiskSim – Storage System Simulator Michigan-CMU

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  1. Sriram Govindan sgovinda@cse DiskSim – Storage System SimulatorMichigan-CMU

  2. Application file system (buffer cache) IO-driver bus disk controller disk cache disk array Flow Very simple process model Simulated by DiskSim

  3. What is happening? • Request flow through a series of storage components • We are interested in the time the request took in each such component – model each component. • Write equations for each component that captures its latency • eg. equation to calculate seek time, given current head position, cylinder to seek etc. (separate equations for barracuda disk and Seagate disk - obtained through micro-benchmarks), • eg. constants for other models (bus arbitration). • Capture dependency among request. • We are also interested in component/ workload/ software characteristics (impact on each other) • Compare performance/fairness of different IO-Driver scheduling algorithms. • Vary cache size/stripe units for workload and see its impact etc.

  4. What it is • Highly accurate and widely used. • Open Source, written in “C” - what else v need? :-) • Easily attach to a full system simulator. • Driven by, • External I/O request trace. • Internally generated Synthetic workloads.

  5. What it is not • Cannot model interactions with other system components, unless integrated with an accurate full system simulator. • CPU Scheduler effects. • Other components competing for BUS etc. • Work with numbers and not with data, Of course.

  6. Ok, now i want to work with DiskSim ? • Sure.. • Go to, http://www.pdl.cmu.edu/DiskSim/ • Download DiskSim and Of course install it. • Older version of GCC ?? • Help !!! • download reference manual • Join DiskSim Mailing list

  7. DiskSim files of interest • Trace file websearch_trace • 2, 8558368, 8192, R, 1533.481433 • 0, 23567168, 32768, R, 1533.482327 • 1, 19115920, 8192, R, 1533.974335 • 0, 32023120, 24576, R, 1533.974568 • 2, 25869888, 16384, R, 1533.979951 • Disk specs disk_specs • Parameter file parameter_file • Output file output_file

  8. Running DiskSim • DiskSim3.0 Reference manual – page 7, Section2.

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