// returns the occurrence of each buckets in all disks
func listAllBuckets(ctx context.Context, storageDisks []StorageAPI, healBuckets map[string]VolInfo, readQuorum int) error {
	g := errgroup.WithNErrs(len(storageDisks))
	var mu sync.Mutex
	for index := range storageDisks {
		index := index
		g.Go(func() error {
			if storageDisks[index] == nil {
				// we ignore disk not found errors
				return nil

func getDisksInfo(disks []StorageAPI, endpoints []Endpoint, metrics bool) (disksInfo []madmin.Disk) {
	disksInfo = make([]madmin.Disk, len(disks))

	g := errgroup.WithNErrs(len(disks))
	for index := range disks {
		index := index
		g.Go(func() error {
			di := madmin.Disk{
				Endpoint:  endpoints[index].String(),
				PoolIndex: endpoints[index].PoolIdx,

}

// concurrently load bucket metadata to speed up loading bucket metadata.
func (sys *BucketMetadataSys) concurrentLoad(ctx context.Context, buckets []BucketInfo, failedBuckets map[string]struct{}) {
	g := errgroup.WithNErrs(len(buckets))
	bucketMetas := make([]BucketMetadata, len(buckets))
	for index := range buckets {
		index := index
		g.Go(func() error {
			// Sleep and stagger to avoid blocked CPU and thundering

	metadataArray := make([]FileInfo, len(disks))

	opts := ReadOptions{
		ReadData: readData,
		Healing:  healing,
	}

	g := errgroup.WithNErrs(len(disks))
	// Read `xl.meta` in parallel across disks.
	for index := range disks {
		index := index
		g.Go(func() (err error) {
			if disks[index] == nil {
				return errDiskNotFound
			}

			// an error and continue.
			bucketsInConflict.Add(bucket.Name)
		}
	}

	// Add/update buckets that are not registered with the DNS
	bucketsToBeUpdatedSlice := bucketsToBeUpdated.ToSlice()
	g := errgroup.WithNErrs(len(bucketsToBeUpdatedSlice)).WithConcurrency(50)

	for index := range bucketsToBeUpdatedSlice {
		index := index
		g.Go(func() error {
			return globalDNSConfig.Put(bucketsToBeUpdatedSlice[index])
		}, index)