}
		}
		if maxCnt < readQuorum {
			return 0
		}
		return commonCount
	}

	commonWrite = filter(writes)
	commonDelete = filter(deletes)
	return
}

func calcCommonCounter(infos []DiskInfo, readQuorum int) (commonCount uint64) {
	filter := func() (commonCount uint64) {
		maxCnt := 0
		signatureMap := map[uint64]int{}
		for _, info := range infos {
			if info.Error != "" {