if s.walkReadMu != nil {
					s.walkReadMu.Unlock()
				}
				diskHealthCheckOK(ctx, err)
				if err != nil {
					// It is totally possible that xl.meta was overwritten
					// while being concurrently listed at the same time in
					// such scenarios the 'xl.meta' might get truncated
					if !IsErrIgnored(err, io.EOF, io.ErrUnexpectedEOF) {
						internalLogOnceIf(ctx, err, "metacache-walk-read-metadata")
					}

non-versioned bucket and you want to maintain the same permanent delete behavior when on versioning-enabled bucket, you must add a noncurrent expiration policy. The noncurrent expiration lifecycle policy will manage the deletes of the noncurrent object versions in the versioning-enabled bucket. (A version-enabled bucket maintains one current and zero or more noncurrent object versions.)

Versioning must be explicitly enabled on a bucket, versioning is not enabled by default. Object locking enabled...

	if objAPI == nil {
		return errServerNotInitialized
	}

	sys.objAPI = objAPI

	// Load bucket metadata sys.
	sys.init(ctx, buckets)
	return nil
}

// 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))

		}
		results[len(results)-1] = r
		results[len(results)-1].Endpoint = u.String()
	}()
	wg.Wait()

	return results
}

// SpeedTest run GET/PUT tests at input concurrency for requested object size,
// optionally you can extend the tests longer with time.Duration.
func (sys *NotificationSys) SpeedTest(ctx context.Context, sopts speedTestOpts) []SpeedTestResult {

	if lim == 0 || len(fivs) <= lim+1 { // fewer than lim _noncurrent_ versions
		for _, fi := range fivs {
			objectInfos = append(objectInfos, fi.ToObjectInfo(i.bucket, i.objectPath(), versioned))
		}
		return objectInfos, nil
	}

	overflowVersions := fivs[lim+1:]
	// Retain the current version + most recent lim noncurrent versions
	for _, fi := range fivs[:lim+1] {