Talk:Legacy system

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thank you very much this search term "Legacy system" was exactly what I was looking for.

BUT:

Actually I need (now as I understand what it is) the German word or German definition or entry. Direct translation to German makes no sense since it is a specific professional definition.

Because I was missing it: I suggest for every wikipedia entry a link to the same entry in other languages (indicating if there is an entry and/ or suggesting to write an translation of it in their own language)

Only specialists know the specific definitions in their field of profession.

regards Erwin Munich, Germany.

awsome explanataion

[edit] Availability versus Reliability

Re: The phrase, "Extremely high AVAILABILITY." Should this not read, "Extremely high RELIABILITY?"

No, legacy systems aren't particularly reliable; components fail in them all the time. But if we're speaking of mainframe computers, they often contain massive amounts of redundancy so even in the face of a hard failure of some component or other, the system as a whole continues to be "available" for use. For example, they often contain N+1 (or better) power supplies so that one power supply can totally fail and the system keeps processing using the other "N" supplies. Within the CPU, the latest Z/OS processor chips contain two cores that operate in lock-step, executing the exact same instruction stream; additional logic compares the results between the two processors. If a mismatch is detected, the dilemma is kicked out to a service processor that decides which core got it right and resumes execution as if nothing had gone wrong. If a core continues to fail, the service processor masks it out and operation continues on just the one core. A clear failure has occurred and a service tech must eventually fix the system, but meanwhile, it's still fully available for use.

Atlant 00:20, 28 March 2006 (UTC)

[edit] Legacy system

One of the references points to a legacy system failing, instead of a new system failing. It should be replaced.

Yuhong Bao