BRAVO TECHNOLOGY CENTER

Memory Diagnostics by Sam C. Chan
 
June 3, 2011
 
Duration Confidence Remarks
Less than 1 pass 0% Totally pointless. Status still 100% unknown.
1 complete pass 50% Able to declare "not known to be failed"
1 hr (at least 2 passes) 60% Slightly stronger versions of above declaration
2 hrs 70%
4 hrs 80%
8 hrs 90% Minimum "meaningful" mem diag test
24 hrs 95% Basic ISS* mem diag test
48 hrs 98% Standard ISS mem diag test
72 hrs 99% Comprehensive ISS mem diag test
1 week 99.5% Long term tests
2 weeks 99.9%
3 weeks 99.99%
Longer than 3 weeks 99.99% Practically pointless. No further gain.

Non-Contiguous Cumulative Equivalency

Bravo Policy & Formula

  • any sub-hour session is excluded from consideration
  • all sessions older than 1 week are ineligible
  • equivalency = current session + all eligible previous sessions x 0.5
  • confidence declaration is "as of conclusion of current test session"

Examples

  • 30 min, 1.5 hrs, 2.5 hrs today: 0 + 1.5 + 2.5 = 4 hrs equivalence
  • 4 hrs yesterday, 4 hrs today: 4 /2 + 4 = 6 hrs equivalence
  • 1 hr per day for the past month: 6 / 2 + 1 = 4 hrs equivalence
  • 100 hrs last yr, 8 hrs yesterday: 0 + 8 = 8 hrs equivalence

Tutorial

How to run:  Simply boot with special diagnostics boot disc (CD or USB) on Bravo Sonata workstations, or press F2, F8.  On notebooks, and other non-Bravo workstations, you might need to deal with boot device sequence. (could be tricky)

Program Screen Layout
Top Left: System specs, including memory size detected
Top Right: Current Pass/Test/Pattern/Percentage Status
Bottom Section: Status of overall session statistics, followed by a running log of all errors encountered thus far (if any).

What to look for & report:   1. WallTime   2. Pass   3. Errors

NOTE:  Any error would be displayed in red. Generally, once an error is encountered, you should immediately report it. Most likely, you'd then be advised to terminate the test, after obtaining whatever details that might pertain your situation.

 

*ISS - In-Shop Service    see glossary

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