E-Series TeraScale Debugging and Diagnostics | 12113. Execute the show diag command to view a report of the test results.4. Report any test failures to your Dell Force10 technical support engineer.5. Bring the card back online with the online linecard {slot#} command. The card will be reset.Parity error detection and correctionThere are two types of parity errors: transient and real.• Transient Parity Error— implies that a read value was corrupted in transit but that the actualmemory may not be corrupt. Transient errors are further categorized as a recoverable and phantom.• Recoverable Transient Parity Error—a transient parity error indicated by SRAM that FTOSwas able to correct (rewrite).• Phantom Transient Parity Error—a recoverable parity error for which the software was unableto determine a problem location.• Non-recoverable Error—implies a persistent corrupted memory location for which the only means ofrecovery is to reboot the line card.FTOS has the ability determine the error type when a parity error occurs and correct recoverable transientparity errors using the Parity Error Correction feature. During the SRAM scanning function, anytime thesystem detects a parity error, it must determine which type it is. To distinguish between the two types ofparity errors (transient and non-recoverable), the system maintains a copy of all SRAM writes. If a locationdoes not match the SRAM copy or causes another parity error indication in the status register, the systemrewrites the location. After rewriting the location, the system again reads the location and checks the statusregister for parity error indication. If the location fails either of these two tests after a rewrite, then theparity error is non-recoverable, the location is marked as corrupt, and FTOS generates log messages. If thelocation passes these tests, then the parity error is transient (recoverable), the location is marked as havinghad a transient parity error, and FTOS continues the scan to the end of the SRAM bank.Enable parity error correctionParity Error Correction is disabled by default and consumes 25 megabytes of line card memory when youyou enable it.FTOS#show diag linecard 4Diag status of Linecard slot 4:-------------------------------------------------------------------Card is currently offline.Card level0 diag issued at TUE Mar 27, 2007 05:19:35 AM.Current diag status: Card diags are done (FAIL).Duration of execution: 0 min 0 sec.Number of diags performed: 39Number of diags passed: 36Number of diags failed: 3Number of notification received: 80Last notification received at: TUE Mar 27, 2007 05:19:35 AM
