FlexGroup is the ONTAP technology that enables a single volume namespace to span one or more aggregates and one or more nodes. A FlexVol is hosted within a single aggregate and does not distribute constituents across multiple nodes. Flash Pool and Flash Cache are performance or caching technologies, not multi-node volume namespace technologies. FlexGroup uses multiple member constituents distributed across the cluster to provide scalable NAS capacity and performance while presenting a single namespace to clients. This matters in support cases because FlexGroup troubleshooting involves constituent placement, aggregate distribution, and workload balance across nodes. The wording 'span across one or more aggregates and one or more NetApp nodes' is the exam signature for FlexGroup. It is used when a workload requires a large namespace or high parallelism beyond what a single FlexVol can provide. References/topics: ONTAP FlexGroup volumes, distributed constituents, NAS scalability, aggregate/node distribution, and large namespace design.
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