# MinIO Erasure Code Quickstart Guide [![Slack](https://slack.min.io/slack?type=svg)](https://slack.min.io)

MinIO protects data against hardware failures and silent data corruption using erasure code and checksums. With the highest level of redundancy, you may lose up to half (N/2) of the total drives and still be able to recover the data.

## What is Erasure Code?

// along with this program.  If not, see <http://www.gnu.org/licenses/>.

package parquet

type s3Error struct {
	code       string
	message    string
	statusCode int
	cause      error
}

func (err *s3Error) Cause() error {
	return err.cause
}

func (err *s3Error) ErrorCode() string {
	return err.code
}

func (err *s3Error) ErrorMessage() string {
	return err.message
}

	// on the client node that requested the lock.
	Source string

	// Owner represents unique ID for this instance, an owner who originally requested
	// the locked resource, useful primarily in figuring out stale locks.
	Owner string

	// Quorum represents the expected quorum for this lock type.
	Quorum int
}

// ResponseCode is the response code for a locking request.

		apiRouter.ServeHTTP(rec, req)
		if rec.Code != testCase.expectedRespStatus {
			t.Errorf("Test %d: %s: Expected the response status to be `%d`, but instead found `%d`", i+1, instanceType, testCase.expectedRespStatus, rec.Code)
		}
		// When the operation is successful, check if sending metadata is successful too
		if rec.Code == http.StatusNoContent {

	// For forward compatibility reasons, we need to add this code.
	if len(dataUsageInfo.BucketsUsage) == 0 {
		dataUsageInfo.BucketsUsage = make(map[string]BucketUsageInfo, len(dataUsageInfo.BucketSizes))
		for bucket, size := range dataUsageInfo.BucketSizes {
			dataUsageInfo.BucketsUsage[bucket] = BucketUsageInfo{Size: size}
		}
	}

	// For backward compatibility reasons, we need to add this code.
	if len(dataUsageInfo.BucketSizes) == 0 {

	}

	// Similar check to http.checkWriteHeaderCode
	if err.HTTPStatusCode < 100 || err.HTTPStatusCode > 999 {
		bugLogIf(ctx, fmt.Errorf("invalid WriteHeader code %v from %v", err.HTTPStatusCode, err.Code))
		err.HTTPStatusCode = http.StatusInternalServerError
	}

	// Generate error response.
	errorResponse := getAPIErrorResponse(ctx, err, reqURL.Path,

| token          | string     | Token from the AssumeRoleWithCustomToken call for external verification |

### Response

If the token is valid and access is approved, the plugin must return a `200` (OK) HTTP status code.

A `200 OK` Response should have `application/json` content-type and body with the following structure:

```json
{
    "user": <string>,
    "maxValiditySeconds": <integer>,
    "claims": <key-value-pairs>
}

minio server --address :9003 /data/tenant3
```

![Example-1](https://github.com/minio/minio/blob/master/docs/screenshots/Example-1.jpg?raw=true)

### 1.2 Host Multiple Tenants on Multiple Drives (Erasure Code)

Use the following commands to host 3 tenants on multiple drives:

```sh
minio server --address :9001 /disk{1...4}/data/tenant1
minio server --address :9002 /disk{1...4}/data/tenant2

This product includes software developed at MinIO, Inc.
(https://min.io/).

The MinIO project contains unmodified/modified subcomponents too with
separate copyright notices and license terms. Your use of the source
code for these subcomponents is subject to the terms and conditions

)

//go:generate msgp -file $GOFILE

var (
	errTierMissingCredentials = AdminError{
		Code:       "XMinioAdminTierMissingCredentials",
		Message:    "Specified remote credentials are empty",
		StatusCode: http.StatusForbidden,
	}

	errTierBackendInUse = AdminError{
		Code:       "XMinioAdminTierBackendInUse",
		Message:    "Specified remote tier is already in use",
		StatusCode: http.StatusConflict,