never change a running system

English

Etymology

From the field of computing, likely from German never change a running system.

Proverb

never change a running system

Do not change something while it is working (because there is a risk of breaking it).
- 2007, Xing Zhou, Thomas Dreibholz, Erwin P. Rathgeb, “Improving the Load Balancing Performance of Reliable Server Pooling in Heterogeneous Capacity Environments”, in Serge Fdida, Kazunori Sugiura, editors, Sustainable Internet: Third Asian Internet Engineering Conference, AINTEC 2007 […], →ISBN, page 126:
  That is, applying a specialised new policy to only improve a temporary capacity extension may be unsuitable (“Never change a running system!”).
- 2012, Tiziana Margaria, Bernhard Steffen, “Service-Orientation: Conquering Complexity with XMDD”, in Mike Hinchey, Lorcan Coyle, editors, Conquering Complexity, →ISBN, page 224:
  This is the weakest point of the current practice: the deployment of complex systems on a heterogeneous, distributed platform is typically a nightmare, the required system-level testing is virtually unsupported, and maintenance and upgrading very often turn out to be extremely time consuming and expensive, de facto responsible for the slogan “never change a running system”.
- 2019, Boris Scholl, Trent Swanson, Peter Jausovec, Cloud Native: Using Containers, Functions, and Data to Build Next-Generation Applications‎^[2], →ISBN:
  “Never change a running system” is a widely used statement in software development, and it is also applicable when you consider moving your application to the cloud.
- 2021, Andreas Graesser, Escape the Change Dilemma: Transformation to a Smart Data-Driven World‎^[3], →ISBN:
  It’s not a coincidence that the following saying offers insight into the CIOs’ minds: ‘Never change a running system.’ However, just keeping the lights on seems to prevent innovation.

Usage notes

This proverb is primarily used by non-native speakers of English.

Synonyms

German

Etymology

Pseudo-anglicism, possibly from the field of computing, although this origin is disputed.^[1]

Pronunciation

Audio: (file)

Proverb

never change a running system

if it ain't broke, don't fix it; leave well enough alone

References

^ 2020 (1st October), Pierre (Pierre Kurby), "Was bedeutet „Never change a running system“? Bedeutung, Definition, Erklärung", in the blog BedeutungOnline^[1]

[1] 2020 (1st October), Pierre (Pierre Kurby), "Was bedeutet „Never change a running system“? Bedeutung, Definition, Erklärung", in the blog BedeutungOnline^[1]

[1]