AOSPERF01-BP02 Check shard-to-CPU ratio
Shards are allocated a minimum of 1.5 vCPUs per shard, supporting efficient processing and scalability.
Level of risk exposed if this best practice is not established: High
Desired outcome: The Shard-to-CPU ratio is maintained at a minimum level of 1.5 vCPUs per shard. This may vary depending on the use case. Search use cases might require a higher ratio, while log analytics use cases may work with a smaller ratio.
Benefits of establishing this best practice:
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A minimum shard-to-CPU ratio of 1.5 helps support each shard with sufficient processing power, reducing the risk of bottlenecks and promoting performance during indexing or search operations.
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By provisioning at least 1.5 vCPUs per shard, you can scale your cluster more efficiently, either by scaling up (increasing instance size) or out (adding more data nodes), to meet changing workload demands without sacrificing performance.
Implementation guidance
During indexing or search operations, each shard should use at least one vCPU to process requests. To guarantee sufficient processing capacity, maintain a minimum shard-to-CPU ratio of 1:1.5. This means that if you have 10 shards in your cluster, for example, you should provision at least 15 vCPUs (10 x 1.5 = 15). You can scale up or out to meet the needs of your cluster based on the total number of shards their density in your data nodes.
In addition to the recommended shard-to-CPU ratio, for more detail, see AOSPERF01-BP01. This helps to align shard sizes with your workload requirements.
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