Disk types in Managed Service for OpenSearch

Managed Service for OpenSearch allows you to use network and local storage drives for database clusters. Network drives are based on network blocks, which are virtual disks in the Yandex Cloud infrastructure. Local disks are physically located on the cluster servers.

When creating a cluster, you can select the following disk types for data storage:

• Network HDD storage (network-hdd): Most cost-effective option for clusters that do not require high read/write performance.

• Network SSD storage (network-ssd): Balanced solution. Such disks are slower than local SSD storage, but, unlike local disks, they ensure data integrity if Yandex Cloud hardware fails.

• Non-replicated SSD storage (network-ssd-nonreplicated): Network SSD storage with enhanced performance but without redundancy.

  The storage size can only be increased in 93 GB increments.

• Local SSDs (local-ssd): Disks with the fastest performance.

  The size of such a storage can be increased:

  • For Intel Cascade Lake: In 100 GB increments only.
  • For Intel Ice Lake: In 368 GB increments only.

  Note

  For clusters with hosts residing in the ru-central1-d availability zone, local SSD storage is not available if using the Intel Cascade Lake platform.

Selecting storage type when creating a clusterSelecting storage type when creating a cluster

The number of hosts with the DATA role you can create together with an OpenSearch cluster depends on the selected storage type:

• With local SSD (local-ssd) or non-replicated SSD (network-ssd-nonreplicated) storage, you can create a cluster with three or more hosts. This cluster will be fault-tolerant.

  Local SSD storage has an effect on how much a cluster will cost: you pay for it even if it is stopped. For more information, refer to the pricing policy.

• With HDD (network-hdd) or SSD (network-ssd) network storage, you can add any number of hosts within the current quota.

For more information about limits on the number of hosts per cluster, see Quotas and limits.

To improve fault tolerance, you can set up index replication (for multi-host cluster configurations only).