serverPools := make(serverPoolsAvailableSpace, len(z.serverPools))

	storageInfos := make([][]*DiskInfo, len(z.serverPools))
	nSets := make([]int, len(z.serverPools))
	g := errgroup.WithNErrs(len(z.serverPools))
	for index := range z.serverPools {
		// Skip suspended pools or pools participating in rebalance for any new
		// I/O.

		t.Fatal(err)
	}

	z, ok := obj.(*erasureServerPools)
	if !ok {
		t.Fatal("unexpected object layer type")
	}

	versions := make([]string, 2)
	for i := range z.serverPools {
		objInfo, err := z.serverPools[i].PutObject(ctx, bucketName, objectName,
			mustGetPutObjReader(t, bytes.NewReader([]byte("abcd")), int64(len("abcd")), "", ""), ObjectOptions{
				Versioned: true,
			})
		if err != nil {

		// Start rebalance routine if we can reload rebalance metadata.
		z.StartRebalance()
	}

	meta := poolMeta{}
	if err := meta.load(ctx, z.serverPools[0], z.serverPools); err != nil {
		return err
	}

	update, err := meta.validate(z.serverPools)
	if err != nil {
		return err
	}

	// if no update is needed return right away.
	if !update {
		z.poolMetaMutex.Lock()
		z.poolMeta = meta

	var ok bool
	for i := range z.serverPools {
		if z.findIndex(i) == -1 {
			// Also ensure to initialize rebalanceStats to indicate
			// its a new pool that can receive rebalanced data.
			z.rebalMeta.PoolStats = append(z.rebalMeta.PoolStats, &rebalanceStats{})
			ok = true
		}
	}
	if ok {
		return z.rebalMeta.save(ctx, z.serverPools[0])
	}

	return nil
}

		objLayer.(*erasureServerPools).serverPools[0].erasureDisksMu.Lock()
		copy(disks, newDisks)
		objLayer.(*erasureServerPools).serverPools[0].erasureDisksMu.Unlock()
	}
	getDisk := func(n int) StorageAPI {
		objLayer.(*erasureServerPools).serverPools[0].erasureDisksMu.Lock()
		disk := disks[n]
		objLayer.(*erasureServerPools).serverPools[0].erasureDisksMu.Unlock()
		return disk
	}

	// Load latest rebalance status
	meta := &rebalanceMeta{}
	err = meta.load(ctx, z.serverPools[0])
	if err != nil {
		return r, err
	}

	// Compute disk usage percentage
	si := z.StorageInfo(ctx, true)
	diskStats := make([]struct {
		AvailableSpace uint64
		TotalSpace     uint64
	}, len(z.serverPools))
	for _, disk := range si.Disks {
		// Ignore invalid.

				writeErrorResponseJSON(ctx, w, toAdminAPIErr(ctx, errInvalidArgument), r.URL)
				return
			}
		}
		var pool *erasureSets
		for pidx := range z.serverPools {
			if pidx == idx {
				pool = z.serverPools[idx]
				break
			}
		}
		if pool == nil {
			// We didn't find any matching pools, invalid input
			writeErrorResponseJSON(ctx, w, toAdminAPIErr(ctx, errInvalidArgument), r.URL)

				t.Fatalf("Failed to putObject %v", err)
			}

			partsMetadata, errs := readAllFileInfo(ctx, erasureDisks, "", bucket, object, "", false, true)
			fi, err := getLatestFileInfo(ctx, partsMetadata, z.serverPools[0].sets[0].defaultParityCount, errs)
			if err != nil {
				t.Fatalf("Failed to getLatestFileInfo %v", err)
			}

			for j := range partsMetadata {
				if errs[j] != nil {

	meta := objLayer1.(*erasureServerPools).poolMeta
	pools := objLayer1.(*erasureServerPools).serverPools

	objLayer2, fsDirs, err := prepareErasurePools()
	if err != nil {
		t.Fatalf("Initialization of object layer failed for Erasure setup: %s", err)
	}
	defer removeRoots(fsDirs)

	newPools := objLayer2.(*erasureServerPools).serverPools
	reducedPools := pools[1:]
	orderChangePools := []*erasureSets{
		pools[1],
		pools[0],
	}

		if a != b {
			return a
		}
		return buckets[i].Created.After(buckets[j].Created)
	})

	// Load bucket totals
	cache := dataUsageCache{}
	if err := cache.load(ctx, z.serverPools[poolIdx].sets[setIdx], dataUsageCacheName); err == nil {
		dataUsageInfo := cache.dui(dataUsageRoot, nil)
		tracker.ObjectsTotalCount = dataUsageInfo.ObjectsTotalCount
		tracker.ObjectsTotalSize = dataUsageInfo.ObjectsTotalSize