The Longhorn documentation provides best practice recommendations for deploying Longhorn in production environments. Before configuring workloads, ensure that you have set up the following basic requirements for optimal disk performance.
- SATA/NVMe SSDs or disk drives with similar performance
- 10 Gbps network bandwidth between nodes
- Dedicated Priority Classes for system-managed and user-deployed Longhorn components
The following sections outline other recommendations for achieving optimal disk performance.
Storage network: Use a dedicated storage network to improve IO performance and stability.
Longhorn disk: Use a dedicated disk for Longhorn storage instead of using the root disk.
Replica count: Set the default replica count to "2" to achieve data availability with better disk space usage or less impact to system performance. This practice is especially beneficial to data-intensive applications.
Storage tag: Use storage tags to define storage tiering for data-intensive applications. For example, only high-performance disks can be used for storing performance-sensitive data. You can either add disks with tags or create StorageClasses with tags.
Data locality: Use
best-effortas the default data locality of Longhorn Storage Classes.
For applications that support data replication (for example, a distributed database), you can use the
strict-localoption to ensure that only one replica is created for each volume. This practice prevents the extra disk space usage and IO performance overhead associated with volume replication.
For data-intensive applications, you can use pod scheduling functions such as node selector or taint toleration. These functions allow you to schedule the workload to a specific storage-tagged node together with one replica.
Recurring snapshots: Periodically clean up system-generated snapshots and retain only the number of snapshots that makes sense for your implementation.
For applications with replication capability, periodically delete all types of snapshots.
Recurring backups: Create recurring backup jobs for mission-critical application volumes.
System backup: Run periodic system backups.