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NDB is a software solution that can be deployed on Nutanix clusters running AHV or ESXi. NDB can be deployed with a single control plane VM, across multiple Nutanix clusters, with high availability (HA) configurations, and multi-cluster with HA configurations. However NDB is installed and configured, the database administration functions - provisioning, cloning, copy data management, patching, and backup - remain the same. In an HA deployment, the API, GUI, and metadata repository are resilient and will stay online during upgrades or a failure of a single VM. You can learn more about the configuration of the NDB control plane from the next page in this guide.
NDB can be deployed as a single control plane VM; this install is ideal for situations where you do not need data resiliency for NDB’s API, GUI or metadata. However, the Nutanix Cloud Platform hosting the VM is highly available and resilient. During upgrades, NDB functionality will be offline during parts of the upgrade process.
If you have multiple Nutanix clusters, you can deploy NDB across two or more clusters, which can address several use cases, including the following.
To ensure high availability with auto-failover for the NDB control plane, Nutanix requires three Nutanix clusters, running AHV or ESXi, to distribute the NDB control plane VMs across failure domains. To protect against site failure, these should be at separate DCs or sites with a round-trip time (RTT) of less than 25ms. Network latency greater than 25ms between selected clusters is not supported. A two-cluster topology is not supported as the Nutanix cluster running two API servers and two repository servers is considered a single point of failure.
When running HA on multiple clusters, the VLAN for the HA VMs needs to be shared on both clusters, or a stretched VLAN between the HA Proxy’s servers is required to place them on different Nutanix Clusters.
The NDB Administration Guide has the most up-to-date requirements for IP address and VM distribution to fit the needs of your Nutanix environment. The NBD HA reference architecture link below is also a good guide to see what best works in your environment.
* In multi-cluster topologies:
* NDB server: In a non-HA configuration, the NDB server hosts all NDB service control plane components. When you enable HA, the original NDB server becomes the first NDB API server as part of the HA scale-out, which is why it does not exist in HA topology options.
Follow this link to find a reference architecture for NDB HA. This reference architecture is a comprehensive guide to configuring and deploying NDB High Availability (HA) with Nutanix AHV across multiple Nutanix clusters.
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