func Enabled(kvs config.KVS) bool {
	ssc := kvs.Get(ClassStandard)
	rrsc := kvs.Get(ClassRRS)
	return ssc != "" || rrsc != ""
}

// DefaultParityBlocks returns default parity blocks for 'drive' count
func DefaultParityBlocks(drive int) int {
	switch drive {
	case 1:
		return 0
	case 3, 2:
		return 1
	case 4, 5:
		return 2
	case 6, 7:
		return 3
	default:
		return 4

		tt := tt
		t.(*testing.T).Run("", func(t *testing.T) {
			globalStorageClass.Update(tt.storageClassCfg)
			actualReadQuorum, actualWriteQuorum, err := objectQuorumFromMeta(ctx, tt.parts, tt.errs, storageclass.DefaultParityBlocks(len(erasureDisks)))
			if tt.expectedError != nil && err == nil {
				t.Errorf("Expected %s, got %s", tt.expectedError, err)
			}
			if tt.expectedError == nil && err != nil {