From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me X-Spam-Level: X-Spam-Status: No, score=-1.3 required=5.0 tests=BAYES_00,INVALID_MSGID autolearn=no autolearn_force=no version=3.4.4 X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 103376,5ac12f5a60b1bfe X-Google-Attributes: gid103376,public X-Google-Thread: f43e6,5ac12f5a60b1bfe X-Google-Attributes: gidf43e6,public From: Ken Garlington Subject: Re: Ariane 5 - not an exception? Date: 1996/07/29 Message-ID: <31FCAA74.5B47@lmtas.lmco.com>#1/1 X-Deja-AN: 170881481 references: <31F8FD5F.41C67EA6@escmail.orl.mmc.com> content-type: text/plain; charset=us-ascii organization: Lockheed Martin Tactical Aircraft Systems mime-version: 1.0 newsgroups: comp.software-eng,comp.lang.ada x-mailer: Mozilla 2.02 (Macintosh; I; 68K) Date: 1996-07-29T00:00:00+00:00 List-Id: Theodore E. Dennison wrote: > > I could see the logic in rewriting the code on the backup machine > to try to continue with "best effort" data when an error is detected, > but I can't agree with the logic that the primary machine should > continue to spit out data, even when it knows it has errors (and there > is a backup machine available), which is what the committe seems to > be suggesting. Note that this would require the backup computer to have different software than the primary. That isn't the case now: "There are two SRIs operating in parallel, with identical hardware and software. One SRI is active and one is in "hot" stand-by, and if the OBC detects that the active SRI has failed it immediately switches to the other one, provided that this unit is functioning properly." To keep the software identical in both, you would want both to attempt to produce semi-valid data in the presence of errors. Having identical software in both might be advantageous from an analysis standpoint. > -- > T.E.D. > | Work - mailto:dennison@escmail.orl.mmc.com | > | Home - mailto:dennison@iag.net | > | URL - http://www.iag.net/~dennison | -- LMTAS - "Our Brand Means Quality"