# Understanding Disk Shard Allocation

**URL:** <https://discuss.elastic.co/t/understanding-disk-shard-allocation/176117>\
**Category:** Elasticsearch\
**Created:** [April 9, 2019, 10:21pm UTC](https://discuss.elastic.co/t/understanding-disk-shard-allocation/176117 "2019-04-09T22:21:54Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![corvintheus](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/corvintheus/32/43816_2.png) [@corvintheus](https://discuss.elastic.co/u/corvintheus)\
**Post date:** [April 9, 2019, 10:21pm UTC](https://discuss.elastic.co/t/understanding-disk-shard-allocation/176117/1 "2019-04-09T22:21:54Z")

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Hi, I have a cluster consists of 3 nodes with different sizes of disk. Now, whenever one of the nodes disk reached its high watermark. It seems that it still getting data and continuously going down. I am not sure what is wrong. My current disk size as of the moment is node1 have 100gb, node2 has 300gb and node3 has 1.5TB. Now I am wondering why its not going on node3 even node1 is already complaining about high watermarks? Thanks

cluster.routing.allocation.enable: all  
cluster.routing.allocation.disk.threshold\_enabled: true  
cluster.routing.allocation.disk.watermark.flood\_stage: 30gb  
cluster.routing.allocation.disk.watermark.low: 100gb  
cluster.routing.allocation.disk.watermark.high: 50gb

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**Author:** ![spinscale](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/spinscale/32/25011_2.png) [@spinscale](https://discuss.elastic.co/u/spinscale)\
**Post date:** [April 11, 2019, 2:28pm UTC](https://discuss.elastic.co/t/understanding-disk-shard-allocation/176117/2 "2019-04-11T14:28:13Z")

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You night want to take a look at the cluster allocation explain API: [https://www.elastic.co/guide/en/elasticsearch/reference/7.0/cluster-allocation-explain.html](https://www.elastic.co/guide/en/elasticsearch/reference/7.0/cluster-allocation-explain.html)

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**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [May 9, 2019, 2:28pm UTC](https://discuss.elastic.co/t/understanding-disk-shard-allocation/176117/3 "2019-05-09T14:28:16Z")

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