serverPools.FilterMaxUsed(100 - (100 * diskReserveFraction))
	total := serverPools.TotalAvailable()
	if total == 0 {
		return -1
	}
	// choose when we reach this many
	choose := rand.Uint64() % total
	atTotal := uint64(0)
	for _, pool := range serverPools {
		atTotal += pool.Available
		if atTotal > choose && pool.Available > 0 {
			return pool.Index
		}
	}

          "exemplar": true,
          "expr": "minio_cluster_replication_proxied_head_requests_total{job=\"$scrape_jobs\"}",
          "interval": "1m",
          "intervalFactor": 2,
          "legendFormat": "{{instance}}",
          "refId": "A"
        }
      ],
      "thresholds": [],
      "timeRegions": [],
      "title": "Total Proxied Head Requests",
      "tooltip": {
        "shared": true,

          "exemplar": true,
          "expr": "minio_cluster_replication_proxied_head_requests_total{job=\"$scrape_jobs\"}",
          "interval": "1m",
          "intervalFactor": 2,
          "legendFormat": "{{instance}}",
          "refId": "A"
        }
      ],
      "thresholds": [],
      "timeRegions": [],
      "title": "Total Proxied Head Requests",
      "tooltip": {
        "shared": true,

          "expr": "sum by (bucket,api) (increase(minio_bucket_requests_total{job=\"$scrape_jobs\"}[$__rate_interval]))",
          "interval": "1m",
          "intervalFactor": 2,
          "legendFormat": "{{bucket,api}}",
          "refId": "A"
        }
      ],
      "thresholds": [],
      "timeRegions": [],
      "title": "Total Requests Rate",
      "tooltip": {
        "shared": true,
        "sort": 2,

          },
          "exemplar": true,
          "expr": "sum by (endpoint,server) (minio_cluster_replication_total_failed_bytes{job=\"$scrape_jobs\"})",
          "interval": "1m",
          "intervalFactor": 2,
          "legendFormat": "{{endpoint}},{{server}}",
          "refId": "A"
        }
      ],
      "title": "Total Failed Data",
      "type": "timeseries"
    },
    {
      "datasource": {

            {
              "datasource": {
                "type": "prometheus",
                "uid": "${datasource}"
              },
              "expr": "sum(irate(container_cpu_usage_seconds_total{container=\"discovery\", pod=~\"istiod-.*|istio-pilot-.*\"}[1m]))",
              "format": "time_series",
              "intervalFactor": 1,
              "legendFormat": "Discovery (container)",
              "refId": "A"

          "exemplar": false,
          "expr": "max(minio_cluster_drive_offline_total{job=~\"$scrape_jobs\"})",
          "format": "time_series",
          "hide": false,
          "instant": true,
          "legendFormat": ".",
          "range": false,
          "refId": "B"
        }
      ],
      "title": "Total Online/Offline Drives",
      "type": "gauge"
    },
    {
      "datasource": {

  EXPECT_TF_META("v", list.size(), TF_ATTR_STRING, list_total_size);
  std::unique_ptr<void*[]> values(new void*[list.size()]);
  std::unique_ptr<size_t[]> lens(new size_t[list.size()]);
  std::unique_ptr<char[]> storage(new char[list_total_size]);
  TF_OperationGetAttrStringList(oper, "v", values.get(), lens.get(),
                                list.size(), storage.get(), list_total_size,
                                s_);

  TF_AttrType type;

  // Total size the attribute value.
  // The units of total_size depend on is_list and type.
  // (1) If type == TF_ATTR_STRING and is_list == 0
  //     then total_size is the byte size of the string
  //     valued attribute.
  // (2) If type == TF_ATTR_STRING and is_list == 1
  //     then total_size is the cumulative byte size
  //     of all the strings in the list.

			dcinfo := DiskInfo{}
			di, err := getDiskInfo(s.drivePath)
			if err != nil {
				return dcinfo, err
			}
			dcinfo.Major = di.Major
			dcinfo.Minor = di.Minor
			dcinfo.Total = di.Total
			dcinfo.Free = di.Free
			dcinfo.Used = di.Used
			dcinfo.UsedInodes = di.Files - di.Ffree
			dcinfo.FreeInodes = di.Ffree
			dcinfo.FSType = di.FSType
			diskID, err := s.GetDiskID()