Goal

A solution to provide steps in price lists so the calculations are discreet and not continuous

User stories

• As a admin, I want to be able to define a minimum step in time and or measurements for the cost model, so that the price becomes discreet.

Problem

Many cost models are discreet in nature and a multiple of the measurement unit. For instance, a customer pays an amount for a service by hour, or by KB, not by millisecond or byte.

Traditionally, cost models in red hat are charged by CPU or socket, not millicores or equivalent, but OCP provides information about CPU usage in millicores. If we want to replicate the price lists for OpenShift online, price lists, we need to be ready to be able to define a minimum step in rates.

Why is this important

It allows admins to manage their price models to be closely following real use case examples, without being overly complicated. Without this use case, the customer would not be able to assign prices that make sense in many ways.

Examples

Example 1.

A user define a price per hour per GB of data. Due to the constraints of the storage the minimum data stored is actually 1GB, so a customer using 1B is still consuming 1GB of storage. The price can be defined as $1/GB/hour with a minimum step of 1GB and 1 h.

A customer then consumes 1450 KB of data during 1 hour and 15 minutes. He is charged 2GB * 2h * $1 /GB /h = $4.

Example 2.

A node is charged $100 per CPU and month per maintenance. A customer has a cluster that is reporting 5.8 CPU. He is charged $600 /month in maintenance.

Example 3.

A license is granted by node per pair of sockets and per month $100/ pair of sockets/month. The customer creates a cluster with 4 nodes, each one with one socket. The price is $400 /month

Example 4.

A license is granted by noder per pair of sokects and annually $1000/ pair of sockets / year. The customer creates a cluster with 4 nodes, each one with one socket. The price is $4000

The license is next year assigned  to a cluster of 4 nodes, with two sockets each. The price is still $4000 billed annually