var OfflineDisk StorageAPI // zero value is nil

// erasureObjects - Implements ER object layer.
type erasureObjects struct {
	setDriveCount      int
	defaultParityCount int

	setIndex  int
	poolIndex int

	// getDisks returns list of storageAPIs.
	getDisks func() []StorageAPI

	// getLockers returns list of remote and local lockers.
	getLockers func() ([]dsync.NetLocker, string)

	if err != nil {
		metricsLogIf(ctx, err)
		return nil
	}

	for _, disk := range driveMetrics.storageInfo.Disks {
		labels := []string{
			driveL, disk.DrivePath,
			poolIndexL, strconv.Itoa(disk.PoolIndex),
			setIndexL, strconv.Itoa(disk.SetIndex),
			driveIndexL, strconv.Itoa(disk.DiskIndex),
		}

		m.setDriveBasicMetrics(disk, labels)
		if dm, found := driveMetrics.ioStats[disk.DrivePath]; found {

// but not written in all disks (having quorum)
type PartialOperation struct {
	Bucket              string
	Object              string
	VersionID           string
	Versions            []byte
	SetIndex, PoolIndex int
	Queued              time.Time
	BitrotScan          bool
}

// mrfState sncapsulates all the information
// related to the global background MRF.
type mrfState struct {
	opCh chan PartialOperation

							Bucket:     bucket,
							Object:     object,
							VersionID:  fi.VersionID,
							Queued:     time.Now(),
							SetIndex:   er.setIndex,
							PoolIndex:  er.poolIndex,
							BitrotScan: errors.Is(err, errFileCorrupt),
						})
					})
					// Healing is triggered and we have written
					// successfully the content to client for

	for _, d := range allDisks {
		poolInfo, ok := poolsInfo[d.PoolIndex]
		if !ok {
			poolInfo = make(map[int]madmin.ErasureSetInfo)
		}
		erasureSet, ok := poolInfo[d.SetIndex]
		if !ok {
			erasureSet.ID = d.SetIndex
			cache := dataUsageCache{}
			if err := cache.load(ctx, z.serverPools[d.PoolIndex].sets[d.SetIndex], dataUsageCacheName); err == nil {

		globalMRFState.addPartialOp(PartialOperation{
			Bucket:    bucket,
			Object:    object,
			Queued:    time.Now(),
			Versions:  versions,
			SetIndex:  er.setIndex,
			PoolIndex: er.poolIndex,
		})
	}

	if !opts.Speedtest && len(versions) == 0 {
		// Check if there is any offline disk and add it to the MRF list
		for _, disk := range onlineDisks {

			if ok {
				continue
			}
		}

		if disk.PoolIndex > -1 && disk.SetIndex > -1 {
			if disk.State == madmin.DriveStateOk {
				si := erasureSetUpCount[disk.PoolIndex][disk.SetIndex]
				si.online++
				if disk.Healing {
					si.healing++
					drivesHealing++
				}
				erasureSetUpCount[disk.PoolIndex][disk.SetIndex] = si
			}
		}
	}

	b := z.BackendInfo()

	if b > 0 && b == a {
		opts.Error = fmt.Sprintf("unable to heal %d missing blocks on drives", b)
	}

	opts.Tags = map[string]string{
		"healObject": auditObjectOp{
			Name: opts.Object,
			Pool: er.poolIndex + 1,
			Set:  er.setIndex + 1,
		}.String(),
	}

	auditLogInternal(ctx, opts)
}

func objectErrToDriveState(reason error) string {
	switch {
	case reason == nil:

		if ep.CmdLine != pool {
			continue
		}
		return id
	}
	return -1
}

// GetLocalPoolIdx returns the pool which endpoint belongs to locally.
// if ep is remote this code will return -1 poolIndex
func (l EndpointServerPools) GetLocalPoolIdx(ep Endpoint) int {
	for i, zep := range l {
		for _, cep := range zep.Endpoints {
			if cep.IsLocal && ep.IsLocal {
				if reflect.DeepEqual(cep, ep) {
					return i

			if offlineHost == "" && ep.IsLocal || offlineHost == ep.Host {
				offlineDisks = append(offlineDisks, madmin.Disk{
					Endpoint:  ep.String(),
					State:     string(madmin.ItemOffline),
					PoolIndex: ep.PoolIdx,
					SetIndex:  ep.SetIdx,
					DiskIndex: ep.DiskIdx,
				})
			}
		}
	}
	return offlineDisks
}

// StorageInfo returns disk information across all peers