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What is resource efficiency a measurement of how much a resource is utilized in relation to a specific time period example resource: MRI scanner Time resources is utilized: 6 hours Time period: 24 hours Resource efficiency 6h / 24h = 25% Why care about resource efficiency? Opportunity cost the loss made by not utilizing resources to the fullest we could have used the money spent on that resource on something else [[model-value-transfer-resource-vs-flow-efficiency....
sources of variation resources (eg. experience of staff, variation in machines, break down, …) flow units (eg. variation in customer’s direct or indirect needs, human error) external factors (variation in customer demand) (src: Book_ This is LEAN - Niklas Modig & Par Ahlstrom)
Model: superfluous work work devoted to taking care of secondary needs superfluous work is a very sophisticated form of waste, since we often fail to realize that it is waste. We think we are adding value, but we are not. causes of secondary needs Model_ 3 sources of inefficiency example: managing receipts (src: Book_ This is LEAN - Niklas Modig & Par Ahlstrom)
value transfer when one side (resources) adds value and the other side (the flow unit) receives value high resource efficiency: high % of value adding time high flow efficiency: high % of value receiving time (src: Book_ This is LEAN - Niklas Modig & Par Ahlstrom)
most organisations will find it challenging to define process (and therefore throughput time) as starting when a need arises and ending when the need is fulfilled. (src: Book_ This is LEAN - Niklas Modig & Par Ahlstrom)
Heuristic: when software load balancing becomes insufficient :) scale :( require network access :( specific skill once you start contemplating a load balancer in front of your reverse proxy servers, it's time to look at other options (src: Book_ release it! - Michael Nygard)
Global server load balancing (GSLB) with DNS regional Load Balancers (src: Book_ release it! - Michael Nygard)
(Book_ Release It! - Michael Nygard) Part 1 - Create Stability Ch2 case study Ch3 Stabilize your system Ch04 Stability Anti-patterns Ch05 Stability Patterns Part 2 - Design for production Ch06 case study Ch07 Foundations Ch08 Processes on Machines Ch09 Interconnect Ch10 Control plane Ch11 Security Part 3 - Deliver your system Ch12 Ch13 Ch14 Part 4 - Solve Systemic Problems Ch15 Ch16 Ch17 Model: cap theorem Model_ OSI model...
(src: Book_ release it! - Michael Nygard)
ERROR & SEVERE should require action of the by the operators eg. ERROR circuit breaker tripped to open (probably needs fixing ont he other side of the connection) eg. ERROR failure to connect to database (src: Book_ release it! - Michael Nygard)