# Latency issue **URL:** \ **Category:** Elastic Community and Ecosystem\ **Created:** [June 17, 2016, 8:57am UTC](https://discuss.elastic.co/t/latency-issue/53130 "2016-06-17T08:57:04Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![Clement\_Ros](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/clement_ros/32/6198_2.png) [@Clement\_Ros](https://discuss.elastic.co/u/Clement_Ros)\ **Post date:** [June 17, 2016, 8:57am UTC](https://discuss.elastic.co/t/latency-issue/53130/1 "2016-06-17T08:57:04Z")
Hi everyone, I'm an IT student, and i work for a company. My internship is to develop a solution to log, analyze and visualize the event logs. I do not have many financial resources for this project. So I set up a POC on 3 servers of the ELK stack . The hardware configurations of my servers are as follows: - 2 CPU, Intel(R) Xeon 2,27GHz (4 cores) - 24 Go RAM - 1,5 To SAS disk Each server has this configuration. My ELK stack is composed of Redis, Logstash, ElasticSearch and Kibana. Here is my architecture: ![](https://us1.discourse-cdn.com/elastic/original/2X/c/c45ee45b2a3664d1bed6ca6e645908349e8b2bff.png) Logstash heap size is 1G Elasticsearch Client heap size is 6G Elasticsearch Master heap size is 2G Elasticsearch Data heap size is 4G I have 5 shard, 1 replica. Today I get the logs of a dozen servers. In 4 months I have 3 billion ( 2,05To ) documents in my cluster. I plan to retrieve the logs to hundred servers. In recent days I have observed a slowdown of performance in my cluster. Kibana crash often, the informations takes a long time to appear, etc. I wanted to know how I can tell if the data load is too large for my cluster. What tests should I perform ? thanks for the help 😀 ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [July 6, 2017, 1:44pm UTC](https://discuss.elastic.co/t/latency-issue/53130/2 "2017-07-06T13:44:06Z")