# Scaling elasticsearch **URL:** \ **Category:** Elasticsearch\ **Created:** [April 25, 2017, 8:08am UTC](https://discuss.elastic.co/t/scaling-elasticsearch/83514 "2017-04-25T08:08:44Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![sunilmchaudhari](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/sunilmchaudhari/32/9475_2.png) [@sunilmchaudhari](https://discuss.elastic.co/u/sunilmchaudhari)\ **Post date:** [April 25, 2017, 8:08am UTC](https://discuss.elastic.co/t/scaling-elasticsearch/83514/1 "2017-04-25T08:08:45Z")
Hi, I want to attach one more node to running cluster. Can i do it directly by starting one more instance with pre-requisite setting in ES config? What more I need to do apart from [cluster.name](http://cluster.name) ? What is impact on existing indexes? br, Sunil ---
**Author:** ![dadoonet](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/dadoonet/32/137187_2.png) [@dadoonet](https://discuss.elastic.co/u/dadoonet)\ **Post date:** [April 25, 2017, 8:34am UTC](https://discuss.elastic.co/t/scaling-elasticsearch/83514/2 "2017-04-25T08:34:35Z")
> Can i do it directly by starting one more instance with pre-requisite setting in ES config? Not sure I understood the question. > What more I need to do apart from cluster.name ? Set the discovery unicast list of nodes that are already running so they can discover each others. > What is impact on existing indexes? Allocation of missing replicas if any and rebalancing of shards if needed... ---
**Author:** ![sunilmchaudhari](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/sunilmchaudhari/32/9475_2.png) [@sunilmchaudhari](https://discuss.elastic.co/u/sunilmchaudhari)\ **Post date:** [April 25, 2017, 9:11am UTC](https://discuss.elastic.co/t/scaling-elasticsearch/83514/3 "2017-04-25T09:11:14Z")
> [@dadoonet](#): > > Not sure I understood the question. I mean, I will start ES with same cluster.name on another server in the same network. > [@dadoonet](#): > > Set the discovery unicast list of nodes that are already running so they can discover each others. discovery.zen.ping.unicast.hosts: ["ip-master","ip-data-node-1","ip-data-node-2"] is this setting you are talking about? > [@dadoonet](#): > > rebalancing of shards if needed Is re-balancing of shards required? How to do that? ---
**Author:** ![dadoonet](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/dadoonet/32/137187_2.png) [@dadoonet](https://discuss.elastic.co/u/dadoonet)\ **Post date:** [April 25, 2017, 9:42am UTC](https://discuss.elastic.co/t/scaling-elasticsearch/83514/4 "2017-04-25T09:42:58Z")
> is this setting you are talking about? Yes > Is re-balancing of shards required? How to do that? It's automatic. Don't worry about that. ---
**Author:** ![sunilmchaudhari](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/sunilmchaudhari/32/9475_2.png) [@sunilmchaudhari](https://discuss.elastic.co/u/sunilmchaudhari)\ **Post date:** [April 25, 2017, 9:44am UTC](https://discuss.elastic.co/t/scaling-elasticsearch/83514/5 "2017-04-25T09:44:46Z")
Hi, Thanks. Does it slows down the cluster when additional node joined? I mean, may be because of re-balancing? br, Sunil ---
**Author:** ![dadoonet](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/dadoonet/32/137187_2.png) [@dadoonet](https://discuss.elastic.co/u/dadoonet)\ **Post date:** [April 25, 2017, 10:17am UTC](https://discuss.elastic.co/t/scaling-elasticsearch/83514/6 "2017-04-25T10:17:53Z")
Not that much. Nothing you can notice unless you are already under a heavy load. IIRC recovery process use at most 20mb/s bandwidth. ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [May 23, 2017, 10:30am UTC](https://discuss.elastic.co/t/scaling-elasticsearch/83514/7 "2017-05-23T10:30:51Z")
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