ILM policy behaviour with disk-based shard allocation settings

Elastic Stack Elasticsearch
1

Hi!

I have a cluster with two host data nodes, one warm data node and one cold data node. I have a policy which moves indices from hot to warm, when index grows up to 1gb. I'd like to know, what will happen if warm data node hits cluster.routing.allocation.disk.watermark.high threshold. Will indices (which should be moved from hot to warm) stay on hot nodes?

Thank you in advance!

2

Welcome to our community! :smiley:

1GB is very small for an index. Unless you have low data volumes and retention rates, you should increase that to at least 30+GB.

But yes, if it hits the high watermark it will not be able to move the index.