# Uneven CPU Load Across Cluster 30 Node cluster **URL:** \ **Category:** Elasticsearch\ **Created:** [July 12, 2017, 4:27pm UTC](https://discuss.elastic.co/t/uneven-cpu-load-across-cluster-30-node-cluster/92841 "2017-07-12T16:27:02Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![mario\_wood](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/mario_wood/32/88001_2.png) [@mario\_wood](https://discuss.elastic.co/u/mario_wood)\ **Post date:** [July 12, 2017, 4:27pm UTC](https://discuss.elastic.co/t/uneven-cpu-load-across-cluster-30-node-cluster/92841/1 "2017-07-12T16:27:02Z")
Hi, We have a cluster hosted on EC2 with the following configuration: 3 Master nodes - t2.Medium 3 Client nodes with Kibana - m4.large 12 'Hot' Data nodes - i3.xlarge 12 'Warm' Data nodes - d2.xlarge Log data is being sent to an ELB in front of the 3 client nodes from logstash. We're taking daily index, 9 shards per index, 1 replica - 18 total shards per index. Shard size is at most 30Gb for a full day. Indexes are created on hot nodes, after 2 days routing is changed and the shards are moved to warm nodes. Indices are deleted after 10 days. Currently we're running 3 extra hot nodes and 3 extra warm nodes, we will scale down to 9 of each. We have 12 currently as some older indices have 12 primary shards. The cluster is used for non-prod log data, index rate ranges from between 4k/s to 13k/s, cluster remains relatively responsive to searches during this time. The issue that 6 of the hot nodes are running with high cpu at around 80-90% and the remaining 6 are running at lower cpu, typically around 20-30%. All warm nodes are consistently running at around 20-25%. Can anyone tell me why the load seems to be uneven across the hot nodes, or point me to anything that would help me diagnose the issue further? ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [August 9, 2017, 4:27pm UTC](https://discuss.elastic.co/t/uneven-cpu-load-across-cluster-30-node-cluster/92841/2 "2017-08-09T16:27:04Z")
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