erasure-coding-durability | Python code to calculate the durability of data

erasure-coding-durability is a Python library. erasure-coding-durability has no bugs, it has no vulnerabilities and it has low support. However erasure-coding-durability build file is not available and it has a Non-SPDX License. You can download it from GitHub.

This is a simple statistical model for calculating the probability of losing data that is stored using an erasure coding system, such as Reed-Solomon. In erasure coding, each file stored is divided into D shards of the same length. Then, P parity shards are computed using erasure coding, resulting in D+P shards. Even if shards are lost, the original file can be recomputed from any D of the D+P shards stored. In other words, you can lose any P of the shards and still reconstruct the original file. What we would like to compute is the durability of data stored with erasure coding based on the durability of the individual shards. The durability is the probability of not losing the data over a period of time. The period of time we use here is one year, resulting in annual durability. Systems that use erasure coding to store data will replace shards that are lost. Once a shard is replaced, the data is fully intact again. Data is lost only when P+1 shards are all lost at the same time, before they are replaced.