# Elasticsearch replication performance is slow
**URL:** https://discuss.elastic.co/t/elasticsearch-replication-performance-is-slow/70410
**Category:** Elasticsearch
**Created:** [January 3, 2017, 9:22am UTC](https://discuss.elastic.co/t/elasticsearch-replication-performance-is-slow/70410 "2017-01-03T09:22:58Z")
**Posts on this page:** 5
**Page:** 1
### Author:  [@Andreas\_Tschritter](https://discuss.elastic.co/u/Andreas_Tschritter)
#### Post date: [January 3, 2017, 9:22am UTC](https://discuss.elastic.co/t/elasticsearch-replication-performance-is-slow/70410/1 "2017-01-03T09:22:58Z")
I have an elasticsearch setup that had until now one machine (16core 64GB RAM 4x800GB SSD Ubuntu 16.04 Xenial, containing 1.5TB of log data in 450 indexes, running ES 5.1.1.
Now I added a second, identical server to the cluster. Both are connected via a 10GBit network.
All indexes have 1 shard, and I have configured them to have 1 replica after the second server went online.
Now, replicas are being created, but only slowly. Load on both machines is below 1 and IO rates are at about 2MB/s or less.
I am running the following settings:
```
{
"persistent": {
"cluster": {
"routing": {
"allocation": {
"node_concurrent_incoming_recoveries": "20",
"node_initial_primaries_recoveries": "8",
"node_concurrent_outgoing_recoveries": "20"
}
}
},
"indices": {
"recovery": {
"max_bytes_per_sec": "400mb"
},
"store": {
"throttle": {
"type": "none"
}
}
}
},
"transient": {
"logger": {
"org": {
"elasticsearch": {
"indices": "DEBUG"
}
}
}
}
}
```
indices.store.throttle.type does not seem to exist anymore in ES 5.
Why is this so slow?
I could not find any other settings or throttles.
Is there anything else to look at?
---
### Author:  [@warkolm](https://discuss.elastic.co/u/warkolm)
#### Post date: [January 3, 2017, 9:25am UTC](https://discuss.elastic.co/t/elasticsearch-replication-performance-is-slow/70410/2 "2017-01-03T09:25:20Z")
What version exactly?
What OS?
---
### Author:  [@Andreas\_Tschritter](https://discuss.elastic.co/u/Andreas_Tschritter)
#### Post date: [January 3, 2017, 9:26am UTC](https://discuss.elastic.co/t/elasticsearch-replication-performance-is-slow/70410/3 "2017-01-03T09:26:05Z")
ES 5.1.1 on Ubuntu 16.04 Xenial
---
### Author:  [@Andreas\_Tschritter](https://discuss.elastic.co/u/Andreas_Tschritter)
#### Post date: [January 10, 2017, 12:32pm UTC](https://discuss.elastic.co/t/elasticsearch-replication-performance-is-slow/70410/4 "2017-01-10T12:32:19Z")
Does anybody have an idea?
---
### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [February 7, 2017, 12:32pm UTC](https://discuss.elastic.co/t/elasticsearch-replication-performance-is-slow/70410/5 "2017-02-07T12:32:26Z")
This topic was automatically closed 28 days after the last reply. New replies are no longer allowed.