- Erasure coding used by MinIO is [Reed-Solomon](https://github.com/klauspost/reedsolomon) erasure coding scheme, which has a total shard maximum of 256 i.e 128 data and 128 parity. MinIO design goes beyond this limitation by doing some practical architecture choices.

Raul-Mircea Crivineanu <******@****.***> 1761278731 +0300

ebozduman <******@****.***> 1659654608 -0700

	benchmarkPutObject(b, "Erasure", 10)
}

// BenchmarkPutObject10KbFS - Benchmark FS.PutObject() for object size of 10KB.
func BenchmarkPutObject10KbFS(b *testing.B) {
	benchmarkPutObject(b, "FS", 10*humanize.KiByte)
}

// BenchmarkPutObject10KbErasure - Benchmark Erasure.PutObject() for object size of 10KB.
func BenchmarkPutObject10KbErasure(b *testing.B) {
	benchmarkPutObject(b, "Erasure", 10*humanize.KiByte)
}

provides protection against multiple node/drive failures and [bit rot](https://github.com/minio/minio/blob/master/docs/erasure/README.md#what-is-bit-rot-protection) using [erasure code](https://docs.min.io/community/minio-object-store/operations/concepts/erasure-coding.html). As the minimum drives required for distributed MinIO is 2 (same as minimum drives required for erasure coding), erasure code automatically kicks in as you launch distributed MinIO.

If one or more drives are offline at the start...

func (r *testOneByteReadNoEOF) Read(p []byte) (n int, err error) {
	if r.eof {
		return 0, io.EOF
	}
	n = copy(p, r.data)
	r.eof = true
	return n, nil
}

// Wrapper for calling testMakeBucket for both Erasure and FS.
func TestMakeBucket(t *testing.T) {
	ExecObjectLayerTest(t, testMakeBucket)
}

// Tests validate bucket creation.
func testMakeBucket(obj ObjectLayer, instanceType string, t TestErrHandler) {

}

func (fi FileInfo) shardSize() int64 {
	return ceilFrac(fi.Erasure.BlockSize, int64(fi.Erasure.DataBlocks))
}

// ShardFileSize - returns final erasure size from original size.
func (fi FileInfo) ShardFileSize(totalLength int64) int64 {
	if totalLength == 0 {
		return 0
	}
	if totalLength == -1 {
		return -1
	}
	numShards := totalLength / fi.Erasure.BlockSize
	lastBlockSize := totalLength % fi.Erasure.BlockSize

		format := newFormatErasureV3(setCount, setDriveCount)
		format.ID = deploymentID
		for i := range setCount { // for each erasure set
			for j := range setDriveCount {
				newFormat := format.Clone()
				newFormat.Erasure.This = format.Erasure.Sets[i][j]
				if deploymentID != "" {
					newFormat.ID = deploymentID
				}
				drive := pool.Endpoints[i*setDriveCount+j]

	ErrInvalidErasureEndpoints = newErrFn(
		"Invalid endpoint(s) in erasure mode",
		"Please provide correct combination of local/remote paths",
		"For more information, please refer to https://docs.min.io/community/minio-object-store/operations/concepts/erasure-coding.html",
	)

	ErrInvalidNumberOfErasureEndpoints = newErrFn(
		"Invalid total number of endpoints for erasure mode",
		"Please provide number of endpoints greater or equal to 2",

	// Pre-emptively check if one of the formatted disks
	// is invalid. This function returns success for the
	// most part unless one of the formats is not consistent
	// with expected Erasure format. For example if a user is
	// trying to pool FS backend into an Erasure set.
	if err = checkFormatErasureValues(formatConfigs, storageDisks, setDriveCount); err != nil {
		return nil, err
	}