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Higher than typical latency for highly loaded storage indicates saturation (overload) and is frequent cause of performance problems. Higher than normal latency also can indicate internal storage problems.", "editable": true, "error": false, "fill": 2, "grid": {}, "gridPos": { "h": 7, "w": 24, "x": 0, "y": 11 }, "id": 59, "legend": { "alignAsTable": true, "avg": true, "current": false, "hideEmpty": true, "hideZero": true, "max": true, "min": false, "rightSide": true, "show": true, "sort": null, "sortDesc": null, "total": false, "values": true }, "lines": true, "linewidth": 2, "links": [], "nullPointMode": "null as zero", "percentage": false, "pointradius": 1, "points": false, "renderer": "flot", "seriesOverrides": [], "spaceLength": 10, "stack": false, "steppedLine": false, "targets": [ { "calculatedInterval": "2m", "datasourceErrors": {}, "errors": {}, "expr": "irate(node_disk_read_time_seconds_total{k8s_cluster=\"$k8s_cluster\", tidb_cluster=\"$tidb_cluster\"}[5m]) / irate(node_disk_reads_completed_total{k8s_cluster=\"$k8s_cluster\", tidb_cluster=\"$tidb_cluster\"}[5m])", "format": "time_series", "interval": "", "intervalFactor": 1, "legendFormat": "Read: {{ instance }} - {{ device }}", "metric": "", "refId": "A", "step": 300, "target": "" } ], "thresholds": [], "timeFrom": null, "timeRegions": [], "timeShift": null, "title": "Disk Latency", "tooltip": { "msResolution": false, "shared": true, "sort": 0, "value_type": "individual" }, "type": "graph", "xaxis": { "buckets": null, "mode": "time", "name": null, "show": true, "values": [] }, "yaxes": [ { "format": "s", "label": "", "logBase": 2, "max": null, "min": null, "show": true }, { "format": "s", "label": "", "logBase": 1, "max": null, "min": null, "show": true } ], "yaxis": { "align": false, "alignLevel": null } }, { "aliasColors": {}, "bars": false, "dashLength": 10, "dashes": false, "datasource": "${DS_TEST-CLUSTER}", "decimals": 2, "description": "Shows amount of physical IOs (reads and writes) different devices are serving. Spikes in number of IOs served often corresponds to performance problems due to IO subsystem overload.", "editable": true, "error": false, "fill": 2, "grid": {}, "gridPos": { "h": 7, "w": 24, "x": 0, "y": 18 }, "id": 63, "legend": { "alignAsTable": true, "avg": true, "current": false, "hideEmpty": false, "hideZero": true, "max": true, "min": false, "rightSide": true, "show": true, "sort": null, "sortDesc": null, "total": false, "values": true }, "lines": true, "linewidth": 2, "links": [], "nullPointMode": "null as zero", "percentage": false, "pointradius": 1, "points": false, "renderer": "flot", "seriesOverrides": [], "spaceLength": 10, "stack": false, "steppedLine": false, "targets": [ { "calculatedInterval": "2m", "datasourceErrors": {}, "errors": {}, "expr": "irate(node_disk_reads_completed_total{k8s_cluster=\"$k8s_cluster\", tidb_cluster=\"$tidb_cluster\"}[5m])", "format": "time_series", "interval": "", "intervalFactor": 1, "legendFormat": "Read: {{ instance }} - {{ device }}", "metric": "", "refId": "A", "step": 300, "target": "" } ], "thresholds": [], "timeFrom": null, "timeRegions": [], "timeShift": null, "title": "Disk Operations", "tooltip": { "msResolution": false, "shared": true, "sort": 0, "value_type": "individual" }, "type": "graph", "xaxis": { "buckets": null, "mode": "time", "name": null, "show": true, "values": [] }, "yaxes": [ { "format": "iops", "label": "", "logBase": 1, "max": null, "min": 0, "show": true }, { "format": "short", "label": "", "logBase": 1, "max": null, "min": 0, "show": true } ], "yaxis": { "align": false, "alignLevel": null } }, { "aliasColors": {}, "bars": false, "dashLength": 10, "dashes": false, "datasource": "${DS_TEST-CLUSTER}", "decimals": 2, "description": "Shows volume of reads and writes the storage is handling. This can be better measure of IO capacity usage for network attached and SSD storage as it is often bandwidth limited. Amount of data being written to the disk can be used to estimate Flash storage life time.", "editable": true, "error": false, "fill": 2, "grid": {}, "gridPos": { "h": 7, "w": 24, "x": 0, "y": 25 }, "id": 65, "legend": { "alignAsTable": true, "avg": true, "current": false, "hideEmpty": false, "hideZero": true, "max": true, "min": false, "rightSide": true, "show": true, "sort": null, "sortDesc": null, "total": false, "values": true }, "lines": true, "linewidth": 2, "links": [], "nullPointMode": "null as zero", "percentage": false, "pointradius": 1, "points": false, "renderer": "flot", "seriesOverrides": [], "spaceLength": 10, "stack": false, "steppedLine": false, "targets": [ { "calculatedInterval": "2m", "datasourceErrors": {}, "errors": {}, "expr": "irate(node_disk_read_bytes_total{k8s_cluster=\"$k8s_cluster\", tidb_cluster=\"$tidb_cluster\"}[5m])", "format": "time_series", "interval": "", "intervalFactor": 1, "legendFormat": "Read: {{ instance }} - {{ device }}", "metric": "", "refId": "A", "step": 300, "target": "" } ], "thresholds": [], "timeFrom": null, "timeRegions": [], "timeShift": null, "title": "Disk Bandwidth", "tooltip": { "msResolution": false, "shared": true, "sort": 0, "value_type": "individual" }, "type": "graph", "xaxis": { "buckets": null, "mode": "time", "name": null, "show": true, "values": [] }, "yaxes": [ { "format": "Bps", "label": "", "logBase": 1, "max": null, "min": 0, "show": true }, { "format": "short", "label": "", "logBase": 1, "max": null, "min": 0, "show": true } ], "yaxis": { "align": false, "alignLevel": null } }, { "aliasColors": {}, "bars": false, "dashLength": 10, "dashes": false, "datasource": "${DS_TEST-CLUSTER}", "decimals": 2, "description": "Shows how much disk was loaded for reads or writes as average number of outstanding requests at different period of time. High disk load is a good measure of actual storage utilization. Different storage types handle load differently - some will show latency increases on low loads others can handle higher load with no problems.", "editable": true, "error": false, "fill": 2, "grid": {}, "gridPos": { "h": 7, "w": 24, "x": 0, "y": 32 }, "id": 67, "legend": { "alignAsTable": true, "avg": true, "current": false, "hideEmpty": false, "hideZero": true, "max": true, "min": false, "rightSide": true, "show": true, "total": false, "values": true }, "lines": true, "linewidth": 2, "links": [], "nullPointMode": "null", "percentage": false, "pointradius": 1, "points": false, "renderer": "flot", "seriesOverrides": [], "spaceLength": 10, "stack": false, "steppedLine": false, "targets": [ { "calculatedInterval": "2m", "datasourceErrors": {}, "errors": {}, "expr": "irate(node_disk_read_time_seconds_total{k8s_cluster=\"$k8s_cluster\", tidb_cluster=\"$tidb_cluster\"}[5m])", "format": "time_series", "interval": "", "intervalFactor": 1, "legendFormat": "Read: {{instance}} - {{ device }}", "metric": "", "refId": "A", "step": 300, "target": "" } ], "thresholds": [], "timeFrom": null, "timeRegions": [], "timeShift": null, "title": "Disk Load", "tooltip": { "msResolution": false, "shared": true, "sort": 0, "value_type": "individual" }, "type": "graph", "xaxis": { "buckets": null, "mode": "time", "name": null, "show": true, "values": [] }, "yaxes": [ { "format": "short", "label": "", "logBase": 1, "max": null, "min": 0, "show": true }, { "format": "short", "label": "", "logBase": 1, "max": null, "min": 0, "show": true } ], "yaxis": { "align": false, "alignLevel": null } } ], "title": "Disk", "type": "row" } ], "refresh": false, "schemaVersion": 18, "style": "dark", "tags": [], "templating": { "list": [ { "allValue": null, "current": { }, "datasource": "${DS_TEST-CLUSTER}", "hide": 2, "includeAll": false, "label": "K8s-cluster", "multi": false, "name": "k8s_cluster", "options": [ ], "query": "label_values(tikv_engine_block_cache_size_bytes, k8s_cluster)", "refresh": 2, "regex": "", "sort": 1, "tagValuesQuery": "", "tags": [ ], "tagsQuery": "", "type": "query", "useTags": false }, { "allValue": null, "current": { }, "datasource": "${DS_TEST-CLUSTER}", "hide": 2, "includeAll": false, "label": "tidb_cluster", "multi": false, "name": "tidb_cluster", "options": [ ], "query": "label_values(tikv_engine_block_cache_size_bytes{k8s_cluster=\"$k8s_cluster\"}, tidb_cluster)", "refresh": 2, "regex": "", "sort": 1, "tagValuesQuery": "", "tags": [ ], "tagsQuery": "", "type": "query", "useTags": false } ] }, "time": { "from": "now-6h", "to": "now" }, "timepicker": { "refresh_intervals": [ "5s", "10s", "30s", "1m", "5m", "15m", "30m", "1h", "2h", "1d" ], "time_options": [ "5m", "15m", "1h", "6h", "12h", "24h", "2d", "7d", "30d" ] }, "timezone": "", "title": "[SharedScope]Test-Cluster-Performance-Read", "uid": "4aVOvxcWk", "version": 1 }