Index Storage Size for a Cluster

Elastic Stack Elasticsearch
1

I have a cluster of 3 nodes with 3 primary shards and 2 replica sets. If Node 1 goes down, will the cluster attempt to create whatever shards existed on Node 1 on the remaining nodes?

I am sizing for the index storage requirements of the cluster and want to prevent the scenario of lack of storage space in case a node goes down.

2

If you have 2 replicas configured, all shards will already exist on all nodes. Elasticsearch will not allocate two copies of the same shard to any node, so if one of your nodes fail, your index will go yellow as the replica can not be allocated.

3

Thanks for the reply. How about the case where there is only 1 replica set or where each node does not have the full data set?

Will the cluster attempt to create the "lost shards" among the remaining running nodes?

4

Yes, in that case new replica shards will be allocated in order to maintain the replication factor, which will mean increased disk usage on remaining nodes.

5

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