Hardware requirements
Redis Enterprise Software hardware requirements for development and production environments.
The hardware requirements for Redis Enterprise Software are different for development and production environments.
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In a development environment, you can test your application with a live database.
If you want to test your application under production conditions, use the production environment requirements.
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In a production environment, you must have enough resources to handle the load on the database and recover from failures.
Development environment
You can build your development environment with non-production hardware, such as a laptop, desktop, or small VM or instance, and with these hardware requirements:
| Item | Description | Minimum requirements | Recommended |
|---|---|---|---|
| Nodes per cluster | You can install on one node but many features require at least two nodes. | 1 node | >= 2 nodes |
| RAM per node | The amount of RAM for each node. | 4GB | >= 10GB |
| Storage per node | The amount of storage space for each node. | 10GB | >= 20GB |
Production environment
We recommend these hardware requirements for production systems or for development systems that are designed to demonstrate production use cases:
| Item | Description | Minimum requirements | Recommended |
|---|---|---|---|
| Nodes* per cluster | At least three nodes are required to support a reliable, highly available deployment that handles process failure, node failure, and network split events in a consistent manner. | 3 nodes | >= 3 nodes (Must be an odd number of nodes) |
| Cores* per node | Redis Enterprise Software is based on a multi-tenant architecture and can run multiple Redis processes (or shards) on the same core without significant performance degradation. | 4 cores | >=8 cores |
| RAM* per node | Defining your RAM size must be part of the capacity planning for your Redis usage. | 15GB | >=30GB |
| Ephemeral Storage | Used for storing replication files (RDB format) and cluster log files. | RAM x 2 | >= RAM x 4 |
| Persistent Storage | Used for storing snapshot (RDB format) and AOF files over a persistent storage media, such as AWS Elastic Block Storage (EBS) or Azure Data Disk. | RAM x 3 | In-memory >= RAM x 6 (except for extreme 'write' scenarios) Auto Tiering >= (RAM + Flash) x 5. |
| Network | We recommend using multiple NICs per node where each NIC is >100Mbps, but Redis Enterprise Software can also run over a single 1Gbps interface network used for processing application requests, inter-cluster communication, and storage access. | 1G | >=10G |
*Additional considerations:
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Nodes per Cluster:
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Clusters with more than 35 nodes are not supported. Please contact the Redis support team for assistance if your sizing calls for deploying a larger number of nodes.
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Quorum nodes also must comply with the above minimal hardware requirements.
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To ensure synchronization and consistency, Active-Active deployments with three-node clusters should not use quorum nodes. Because quorum nodes do not store data shards, they cannot support replication. In case of a node failure, replica shards aren't available for Active-Active synchronization.
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Cores:
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When the CPU load reaches a certain level, Redis Enterprise Software sends an alert to the operator.
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If your application is designed to put a lot of load on your Redis database, make sure that you have at least one available core for each shard of your database.
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If some of the cluster nodes are utilizing more than 80% of the CPU, consider migrating busy resources to less busy nodes.
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If all the cluster nodes are utilizing over 80% of the CPU, consider scaling out the cluster by adding a node.
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RAM:
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Redis uses a relatively large number of buffers, which enable replica communication, client communication, pub/sub commands, and more. As a result, you should ensure that 30% of the RAM is available on each node at any given time.
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If one or more cluster nodes utilizes more than 65% of the RAM, consider migrating resources to less active nodes.
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If all cluster nodes are utilizing more than 70% of available RAM, consider adding a node.
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Do not run any other memory-intensive processes on the Redis Enterprise Software node.
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Sizing considerations
General database sizing
Factors to consider when sizing your database.
- Dataset size – Your limit should be greater than your dataset size to leave room for overhead.
- Database throughput – High throughput needs more shards, leading to a higher memory limit.
- Modules – Using modules with your database consumes more memory.
- Database clustering – Allows you to spread your data into shards across multiple nodes.
- Database replication – Enabling replication doubles memory consumption.
Active-Active database sizing
Additional factors for sizing Active-Active databases:
- Active-Active replication – Requires double the memory of regular replication, which can be up to two times (2x) the original data size per instance.
- Database replication backlog – For synchronization between shards. By default, this is set to 1% of the database size.
- Active-Active replication backlog – For synchronization between clusters. By default, this is set to 1% of the database size.
Sizing databases with Auto Tiering enabled
Additional factors for sizing databases with Auto Tiering enabled:
- Database persistence – Auto Tiering uses dual database persistence where both the primary and replica shards persist to disk. This may add some processor and network overhead, especially in cloud configurations with network-attached storage.