To expand storage capacity in a vSAN cluster with one disk group, you can either add more drives to hosts in the cluster, which is commonly referred to as scaling up, or add capacity drives to existing disk groups
Option B: Add an additional disk group - According to search result [1], adding additional drives to a host will increase both capacity and performance [1], and each disk group contains one flash cache device and one or multiple capacity devices for persistent storage [2]. Therefore, adding an additional disk group to each host would increase the storage capacity of the vSAN cluster.
Option D: Increase the number of capacity disks in the existing disk group - Search result [1] explains that vSAN clusters require capacity and cache devices to function, and each disk group can contain multiple capacity devices for persistent storage [2]. Thus, an additional way to expand storage capacity in the vSAN cluster would be to increase the number of capacity disks in the existing disk group.
[Reference: 1: VMware vSAN documentation 2: VMware vSAN documentation, Explanation:, A disk group is a collection of one or more flash-based cache devices and one or more capacity devices that provide storage capacity for a vSAN cluster. A vSAN cluster can have multiple disk groups, and each disk group can have a different configuration., To expand storage capacity in a vSAN cluster where each host currently has only one disk group, the administrator can add an additional disk group or increase the number of capacity disks in the existing disk group., Adding an additional disk group involves adding more disks to the host and creating a new disk group. This approach can provide additional capacity and performance benefits, as the new disk group can be configured with different settings to optimize performance and capacity., Increasing the number of capacity disks in the existing disk group involves adding more capacity devices to the existing disk group. This approach can provide additional capacity, but may not necessarily provide performance benefits as the existing disk group may already be fully utilized., References:, VMware vSAN 7.0 Design and Sizing Guide: https://storagehub.vmware.com/t/vmware-vsan/vmware-vsan-7-0-design-and-sizing-guide-2/, VMware vSAN Documentation: https://docs.vmware.com/en/VMware-vSphere/7.0/com.vmware.vsphere.vsan-planning.doc/GUID-9B7C9685-64C5-49C2-8E3C-CC2E47AFBC6F.html, ]
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