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allow support for parity '0', '1' enabling support for 2,3 drive setups (#15171)

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allows for further granular setups

- 2 drives (1 parity, 1 data)
- 3 drives (1 parity, 2 data)

Bonus: allows '0' parity as well.
This commit is contained in:
Harshavardhana
2022-06-27 20:22:18 -07:00
committed by GitHub
parent b7c7e59dac
commit 9c605ad153
17 changed files with 82 additions and 76 deletions
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2
docs/erasure/README.md
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@@ -24,7 +24,7 @@ MinIO's erasure coded backend uses high speed [HighwayHash](https://github.com/m
## How are drives used for Erasure Code?
MinIO divides the drives you provide into erasure-coding sets of *4 to 16* drives. Therefore, the number of drives you present must be a multiple of one of these numbers. Each object is written to a single erasure-coding set.
MinIO divides the drives you provide into erasure-coding sets of *2 to 16* drives. Therefore, the number of drives you present must be a multiple of one of these numbers. Each object is written to a single erasure-coding set.
Minio uses the largest possible EC set size which divides into the number of drives given. For example, *18 drives* are configured as *2 sets of 9 drives*, and *24 drives* are configured as *2 sets of 12 drives*. This is true for scenarios when running MinIO as a standalone erasure coded deployment. In [distributed setup however node (affinity) based](https://docs.minio.io/docs/distributed-minio-quickstart-guide.html) erasure stripe sizes are chosen.

4
docs/erasure/storage-class/README.md
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@@ -62,9 +62,7 @@ For more complete documentation on Erasure Set sizing, see the [MinIO Documentat
- Less than N/2, if `STANDARD` parity is not set.
- Less than `STANDARD` Parity, if it is set.
As parity below 2 is not recommended, `REDUCED_REDUNDANCY` storage class is not supported for 4 disks erasure coding setup.
Default value for `REDUCED_REDUNDANCY` storage class is `2`.
Default value for `REDUCED_REDUNDANCY` storage class is `1`.
## Get started with Storage Class