Cosmos DB Previews vCore Option for MongoDB

Azure Cosmos DB for MongoDB is previewing a virtual core (vCore) deployment option that provides better cost control and an easier lift-and-shift solution for migration to the service. The vCore option can be used in place of the Request Units (RUs) option (Cosmos DB’s default method), which is often difficult to estimate cost and regulate performance. Deploying by vCore enables developers to select configurations that meet specific performance requirements, simplifies deployments without the need for sharding, and can help control cost and improve budgeting. The deployment option retains all the same integration, security, and controls of the RU option. However, vCore is only available with MongoDB v5, which is also in preview, and may require upgrading older databases. Pricing is based on tiers (ranging from M30 to M300) that offer different size nodes (VMs) from two vCores and 8GB, up to 96 vCores and 384GB. Nodes can be stand-alone or combined into clusters to scale performance. Optional high-availability replicas add cost, and storage is priced separately, based on GBs provisioned. Cosmos DB is discussed in the Azure Roadmap at https://www.directionsonmicrosoft.com/roadmap/ref/cosmos-db.