// Make a volume entry on all underlying storage disks.
		for index := range localDrives {
			index := index
			g.Go(func() error {
				if beforeState[index] == madmin.DriveStateMissing {
					err := localDrives[index].MakeVol(ctx, bucket)
					if err == nil {
						afterState[index] = madmin.DriveStateOk
					}
					return err
				}
				return errs[index]
			}, index)
		}

		errs = g.Wait()
	}

	NSScanner(ctx context.Context, cache dataUsageCache, updates chan<- dataUsageEntry, scanMode madmin.HealScanMode, shouldSleep func() bool) (dataUsageCache, error)

	// Volume operations.
	MakeVol(ctx context.Context, volume string) (err error)
	MakeVolBulk(ctx context.Context, volumes ...string) (err error)
	ListVols(ctx context.Context) (vols []VolInfo, err error)