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docs: update ec description

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Feng Ruohang
2026-09-17 09:42:26 +08:00
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docs/erasure/storage-class/README.md
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@@ -38,31 +38,23 @@ You can calculate _approximate_ storage usage ratio using the formula - total dr
### Allowed values for STANDARD storage class
`STANDARD` storage class implies more parity than `REDUCED_REDUNDANCY` class. So, `STANDARD` parity drives should be
`STANDARD` supports `EC:0` without erasure-code redundancy and nonzero parity values up to `floor(N/2)`, where `N` is the number of drives in the erasure set. When both `STANDARD` and `REDUCED_REDUNDANCY` parity are nonzero, `STANDARD` must be greater than or equal to `REDUCED_REDUNDANCY`; equal parity is allowed.
- Greater than or equal to 2, if `REDUCED_REDUNDANCY` parity is not set.
- Greater than `REDUCED_REDUNDANCY` parity, if it is set.
The default `STANDARD` parity is:
Parity blocks can not be higher than data blocks, so `STANDARD` storage class parity can not be higher than N/2. (N being total number of drives)
The default value for the `STANDARD` storage class depends on the number of volumes in the erasure set:
| Erasure Set Size | Default Parity (EC:N) |
|------------------|-----------------------|
| 5 or fewer | EC:2 |
| 6-7 | EC:3 |
| 8 or more | EC:4 |
| Erasure Set Size | Default Parity (EC:M) |
| --- | --- |
| 1 | EC:0 |
| 2–3 | EC:1 |
| 4–5 | EC:2 |
| 6–7 | EC:3 |
| 8–16 | EC:4 |
For more complete documentation on Erasure Set sizing, see the [Silo Documentation on Erasure Sets](https://silo.pgsty.com/operations/concepts/erasure-coding/#minio-ec-erasure-set).
### Allowed values for REDUCED_REDUNDANCY storage class
`REDUCED_REDUNDANCY` implies lesser parity than `STANDARD` class. So,`REDUCED_REDUNDANCY` parity drives should be
- Less than N/2, if `STANDARD` parity is not set.
- Less than `STANDARD` Parity, if it is set.
Default value for `REDUCED_REDUNDANCY` storage class is `1`.
`REDUCED_REDUNDANCY` parity can be zero or up to `floor(N/2)`. When both storage classes have nonzero parity, its parity must be less than or equal to `STANDARD` parity. The default is `EC:1` for multi-drive sets and `EC:0` for single-drive deployments. See the [Silo storage-class reference](https://silo.pgsty.com/reference/minio-server/settings/storage-class/) for the maintained configuration documentation.
## Get started with Storage Class