"instant": false,
          "interval": "1m",
          "intervalFactor": 1,
          "legendFormat": "",
          "refId": "A"
        }
      ],
      "title": "Number of Buckets",
      "type": "stat"
    },
    {
      "datasource": {
        "type": "prometheus",
        "uid": "${DS_PROMETHEUS}"
      },
      "fieldConfig": {
        "defaults": {

| `minio_cluster_usage_deletemarker_total`     | Total number of delete markers in a cluster                    |
| `minio_cluster_bucket_total`                 | Total number of buckets in the cluster                         |

## Cluster Drive Metrics

| Name                                | Description                           |

// Returns always a same erasure coded set for a given input.
func (s *erasureSets) getHashedSet(input string) (set *erasureObjects) {
	return s.sets[s.getHashedSetIndex(input)]
}

// listDeletedBuckets lists deleted buckets from all disks.
func listDeletedBuckets(ctx context.Context, storageDisks []StorageAPI, delBuckets *xsync.MapOf[string, VolInfo], readQuorum int) error {
	g := errgroup.WithNErrs(len(storageDisks))

	resolver := metadataResolutionParams{
		dirQuorum: listingQuorum,
		objQuorum: listingQuorum,
		bucket:    o.Bucket,
	}

	// Maximum versions requested for "latest" object
	// resolution on versioned buckets, this is to be only
	// used when o.Versioned is false
	if !o.Versioned {
		resolver.requestedVersions = 1
	}
	var limit int
	if o.Limit > 0 && o.StopDiskAtLimit {

		minioMetaMultipartBucket,  // creates .minio.sys/multipart
		dataUsageBucket,           // creates .minio.sys/buckets
		minioConfigBucket,         // creates .minio.sys/config
	}
	// Attempt to create MinIO internal buckets.
	return disk.MakeVolBulk(context.TODO(), volumes...)
}

// Initialize a new storage disk.

// and also that small branches with few objects don't take up unreasonable amounts of space.
// This keeps the cache size at a reasonable size for all buckets.
//
// Whenever a branch is scanned, it is assumed that it will be un-compacted
// before it hits any of the above limits.
// This will make the branch rebalance itself when scanned if the distribution of objects has changed.

// a hyphen. See:
// http://docs.aws.amazon.com/AmazonS3/latest/dev/BucketRestrictions.html
func IsValidBucketName(bucket string) bool {
	// Special case when bucket is equal to one of the meta buckets.
	if isMinioMetaBucketName(bucket) {
		return true
	}
	if len(bucket) < 3 || len(bucket) > 63 {
		return false
	}

	// Split on dot and check each piece conforms to rules.
	allNumbers := true

	rcfg, _ := globalBucketObjectLockSys.Get(bucket)
	if rcfg.LockEnabled && opts.DeletePrefix {
		apiErr := toAPIError(ctx, errInvalidArgument)
		apiErr.Description = "force-delete is forbidden on Object Locking enabled buckets"
		writeErrorResponse(ctx, w, apiErr, r.URL)
		return
	}

	os := newObjSweeper(bucket, object).WithVersion(opts.VersionID).WithVersioning(opts.Versioned, opts.VersionSuspended)

		_, err = obj.PutObject(b.Context(), bucket, key, mustGetPutObjReader(b, bytes.NewBufferString(key), int64(len(key)), "", ""), ObjectOptions{})
		if err != nil {
			b.Fatal(err)
		}
	}

	// List the buckets over and over and over.
	for b.Loop() {
		_, err = obj.ListObjects(b.Context(), bucket, "", "obj9000", "", -1)
		if err != nil {
			b.Fatal(err)
		}
	}
}

```
mc cp ~/images.jpg myminio/images
.../images.jpg:  8.31 KB / 8.31 KB ┃▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓┃ 100.00% 59.42 KB/s 0s
```

Wait a few moments, then check the bucket’s contents with mc ls — you will see a thumbnail appear.

```
mc ls myminio/images-thumbnail
[2017-02-08 11:39:40 IST]   992B images-thumbnail.jpg
```

## Publish MinIO events to NSQ