Kathryn Erickson

VMware and DataStax are proud to announce a joint collaboration to power big data environments on&nbsp;<a href="https://www.vmware.com/products/vsan.html">VMware</a><a href="https://www.vmware.com/products/vsan.html">’</a><a href="https://www.vmware.com/products/vsan.html">s</a>&nbsp;<a href="https://www.vmware.com/products/vsan.html">vSAN</a>. We took this effort on for our cloud-native customers that wanted the operational simplicity that comes with centrally managed storage, as well as the cost savings of hyper-converged environments.

DataStax Enterprise&nbsp;is underpinned by Apache Cassandra™&nbsp;and utilizes a masterless architecture where data is replicated between nodes to achieve availability requirements. Most customers opt for fast local storage to fulfill these requirements without sacrificing performance, but this limited the infrastructure choices for customers that wanted VMware’s Enterprise management options. Partial solutions included:

<ul>
	<li>Adopting a traditional vSAN infrastructure. This doubled the capacity requirements for a system already storing data replicas and risked performance SLAs.</li>
	<li>Disabling replication at the vSAN layer. This eliminated the unneeded replicas but couldn’t guarantee that a virtual machine’s data was stored within the same host. Also, because storage access was still remote, performance SLAs were still at risk.</li>
</ul>

To solve this issue, VMware worked with DataStax to engineer a unique solution. Referred to as&nbsp;<a href="https://docs.vmware.com/en/VMware-vSphere/6.7/com.vmware.vsphere.virtualsan.doc/GUID-CD0915F2-14DD-497C-8086-3F047C390D9A.html">Host</a><a href="https://docs.vmware.com/en/VMware-vSphere/6.7/com.vmware.vsphere.virtualsan.doc/GUID-CD0915F2-14DD-497C-8086-3F047C390D9A.html">–</a><a href="https://docs.vmware.com/en/VMware-vSphere/6.7/com.vmware.vsphere.virtualsan.doc/GUID-CD0915F2-14DD-497C-8086-3F047C390D9A.html">Affinity</a>, this policy offers customers additional flexibility to configure vSAN placement and replication specific to the application that has been deployed.

Host Affinity delegates replication to DataStax Enterprise while maintaining data locality with DataStax Enterprise compute. The Host Affinity policy is available in addition to standard vSAN replication policies and intended to offer customers choice of deployment based on their criticality, uptime, and maintenance requirements.

This solution also gives you the benefits of simplified visibility, lifecycle, and consolidation of computing workloads. The result is a reference architecture that demonstrates how performance consolidation, failure mitigation, and linear scaling can be achieved using vSAN and DataStax together.

For more details on the benefits this collaboration brings, see:

DataStax Enterprise™ (DSE) and vSAN&nbsp;<a href="https://storagehub.vmware.com/t/vmware-vsan/datastax-enterprise-on-vmware-vsan-tm-6-7-all-flash-for-production/">Reference Architecture</a>&nbsp;

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