# Max data node throughput during ES recovery to new data nodes

**URL:** <https://discuss.elastic.co/t/max-data-node-throughput-during-es-recovery-to-new-data-nodes/224976>\
**Category:** Elasticsearch\
**Created:** [March 25, 2020, 11:29am UTC](https://discuss.elastic.co/t/max-data-node-throughput-during-es-recovery-to-new-data-nodes/224976 "2020-03-25T11:29:09Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![the123saurav](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/the123saurav/32/47551_2.png) [@the123saurav](https://discuss.elastic.co/u/the123saurav)\
**Post date:** [March 25, 2020, 11:29am UTC](https://discuss.elastic.co/t/max-data-node-throughput-during-es-recovery-to-new-data-nodes/224976/1 "2020-03-25T11:29:09Z")

</div>

We use ES 6.0 hosted on EC2 boxes with AWS EBS as the storage layer.  
I was digging into the ES recovery API([https://www.elastic.co/guide/en/elasticsearch/reference/current/indices-recovery.html](https://www.elastic.co/guide/en/elasticsearch/reference/current/indices-recovery.html)).  
Below is the recovery settings for my cluster:

```auto
{

  "persistent": {

    "cluster": {

      "routing": {

        "allocation": {

          "cluster_concurrent_rebalance": "2",

          "node_concurrent_recoveries": "2",

          "disk": {

            "watermark": {

              "low": "15.0gb",

              "flood_stage": "5.0gb",

              "high": "10.0gb"

            }

          },

          "node_initial_primaries_recoveries": "4"

        }

      },

      "blocks": {

        "create_index": "false"

      }

    },

    "indices": {

      "recovery": {

        "max_bytes_per_sec": "60mb"

      }

    }

  },

  "transient": {

    "cluster": {

      "routing": {

        "allocation": {

 "cluster_concurrent_rebalance": "2",

          "node_concurrent_recoveries": "2",

          "disk": {

            "watermark": {

              "low": "15.0gb",

              "flood_stage": "5.0gb",

              "high": "10.0gb"

            }

          },

          "exclude": {},

 "node_initial_primaries_recoveries": "4"

        }

      }

    },

    "indices": {

      "recovery": {

 "max_bytes_per_sec": "60mb"

      }

    }

  }

}

```

Questions:

- Is there any recommendation on tuning above params?
- Can someone explain based on above settings what is the max IOPS that can be seen per data node during recovery part from normal traffic?  
Is it node\_concurrent\_recoveries \* max\_bytes\_per\_sec ?

---

<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [April 22, 2020, 11:32am UTC](https://discuss.elastic.co/t/max-data-node-throughput-during-es-recovery-to-new-data-nodes/224976/2 "2020-04-22T11:32:59Z")

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