// 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.
		if disk.PoolIndex < 0 || len(diskStats) <= disk.PoolIndex {
			// https://github.com/minio/minio/issues/16500
			continue
		}
		diskStats[disk.PoolIndex].AvailableSpace += disk.AvailableSpace

			InitFreeSpace:     diskStats[idx].AvailableSpace,
			InitCapacity:      diskStats[idx].TotalSpace,
		}
		copy(r.PoolStats[idx].Buckets, buckets)

		if pfi := float64(diskStats[idx].AvailableSpace) / float64(diskStats[idx].TotalSpace); pfi < r.PercentFreeGoal {
			r.PoolStats[idx].Participating = true
			r.PoolStats[idx].Info = rebalanceInfo{
				StartTime: now,
				Status:    rebalStarted,
			}
		}
	}