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DDS-3 Back-up Parameter Optimization. San Jose State University ISE 202 Donald Kerns 12/7/2001. DDS-3 Back-up Parameter Optimization. Problem Statement : Current weekly server back-ups are taking ~15 hours. This reduces maximum possible server availability and eats into productive time.

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Dds 3 back up parameter optimization

DDS-3 Back-upParameter Optimization

San Jose State University

ISE 202

Donald Kerns

12/7/2001


Dds 3 back up parameter optimization1
DDS-3 Back-up Parameter Optimization

  • Problem Statement:

  • Current weekly server back-ups are taking ~15 hours.

  • This reduces maximum possible server availability and eats into productive time.

  • Goal/Objective Statement:

  • Back-ups to take no longer than 8 hours/week (can happen completely overnight).

  • Increase maximum possible server availability from 92% to >= 95%.

  • Projected Business Benefits:

  • Roughly $55K/year in labor savings.

  • Team:

  • Donald Kerns


Design
Design

  • 23 (2 replicates)

    • no confounding

  • On/Off nature of compression made center points problematic

  • Literature claimed a 5% effect of FIFO size

  • 16 runs ~= 9 hours

    • fits overnight


Data and analysis
Data and Analysis

Fractional Factorial Fit: Time versus Compression, Block Size, FIFO Size

Estimated Effects and Coefficients for Time (coded units)

TermEffectCoefP

Constant 783.6 0.000

Compression -265.0 -132.5 0.000

Block Size -603.2 -301.6 0.000

FIFO Size -7.0 -3.5 0.398

Compress*Block Si -8.8 -4.4 0.290

Compress*FIFO Siz 2.4 1.2 0.765

Block Si*FIFO Siz 9.0 4.5 0.280

Compress*Block Si*FIFO Siz -2.3 -1.1 0.779


Analysis cont
Analysis (cont)

  • Initial result

    • FIFO Size not significant

    • Compression should be on

    • Further investigate block size

  • Chose factor of 2 block sizes

    • Plot speed vs. size

    • Highest speed starts at 32KB


Conclusions
Conclusions

  • New settings:

  • Increase maximum server availability from 91% to 98%.

  • Allow back-ups to be completely performed overnight.


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