cacheInterval:    1 * time.Minute,
		metricsGroupOpts: opts,
	}
	mg.RegisterRead(func(ctx context.Context) (metrics []MetricV2) {
		objLayer := newObjectLayerFn()

		// Fetch disk space info, ignore errors
		metrics = make([]MetricV2, 0, 10)
		storageInfo := objLayer.StorageInfo(ctx, true)
		onlineDrives, offlineDrives := getOnlineOfflineDisksStats(storageInfo.Disks)

	capacityNeeded := uint64(concurrent * size)
	capacity := GetTotalUsableCapacityFree(storageInfo.Disks, storageInfo)

	if capacity < capacityNeeded {
		return false, false, fmt.Sprintf("not enough usable space available to perform speedtest - expected %s, got %s",
			humanize.IBytes(capacityNeeded), humanize.IBytes(capacity))
	}

	// Verify if we can employ autotune without running out of capacity,

var getRemoteInstanceClient = func(r *http.Request, host string) (*miniogo.Core, error) {
	cred := getReqAccessCred(r, globalSite.Region())
	// In a federated deployment, all the instances share config files
	// and hence expected to have same credentials.
	core, err := miniogo.NewCore(host, &miniogo.Options{
		Creds:     credentials.NewStaticV4(cred.AccessKey, cred.SecretKey, ""),
		Secure:    globalIsTLS,