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Support variable server sets (#10314)

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Harshavardhana
2020-11-25 16:28:47 -08:00
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## Erasure code sizing guide
### Toy Setups
Capacity constrained environments, MinIO will work but not recommended for production.
| servers | drives (per node) | stripe_size | parity chosen (default) | tolerance for reads (servers) | tolerance for writes (servers) |
|--------:|------------------:|------------:|------------------------:|------------------------------:|-------------------------------:|
| 1 | 1 | 1 | 0 | 0 | 0 |
| 1 | 4 | 4 | 2 | 0 | 0 |
| 4 | 1 | 4 | 2 | 2 | 3 |
| 5 | 1 | 5 | 2 | 2 | 2 |
| 6 | 1 | 6 | 3 | 3 | 4 |
| 7 | 1 | 7 | 3 | 3 | 3 |
### Minimum System Configuration for Production
| servers | drives (per node) | stripe_size | parity chosen (default) | tolerance for reads (servers) | tolerance for writes (servers) |
|--------:|------------------:|------------:|------------------------:|------------------------------:|-------------------------------:|
| 4 | 2 | 8 | 4 | 2 | 1 |
| 5 | 2 | 10 | 4 | 2 | 2 |
| 6 | 2 | 12 | 4 | 2 | 2 |
| 7 | 2 | 14 | 4 | 2 | 2 |
| 8 | 1 | 8 | 4 | 4 | 3 |
| 8 | 2 | 16 | 4 | 2 | 2 |
| 9 | 2 | 9 | 4 | 4 | 4 |
| 10 | 2 | 10 | 4 | 4 | 4 |
| 11 | 2 | 11 | 4 | 4 | 4 |
| 12 | 2 | 12 | 4 | 4 | 4 |
| 13 | 2 | 13 | 4 | 4 | 4 |
| 14 | 2 | 14 | 4 | 4 | 4 |
| 15 | 2 | 15 | 4 | 4 | 4 |
| 16 | 2 | 16 | 4 | 4 | 4 |