💾 Dell PowerScale F710 vs Pure FlashBlade //S vs NetApp AFF C400

These three platforms all carry the "all-flash, capacity-friendly" label but solve quite different problems. PowerScale F710 is a true scale-out NAS designed to grow as one namespace from a handful of nodes to hundreds of petabytes — it is the natural choice when a single filesystem must keep getting bigger without forklift events. FlashBlade//S is the most modern of the three architecturally: compute and storage scale independently, the DirectFlash Modules push very high throughput, and Evergreen//Forever removes most of the refresh anxiety. AFF C400 is the odd one out — it is a dual-controller capacity-optimised array running ONTAP, with the widest protocol set (block, file and object) and the deepest data services, but it does not scale to the same horizons as the other two.

For AI/ML and high-throughput unstructured workloads, FlashBlade//S has the cleanest story: 400GbE uplinks, disaggregated scale, and a Purity stack that has been tuned for billions of small files and objects. PowerScale F710 is a close competitor here and arguably wins on raw scale ceiling and on integration with Dell's broader AI Factory reference architectures — UK buyers already invested in PowerEdge and PowerScale will find it the lower-friction path. The AFF C400 is not the right answer for a 100GbE-per-node AI training cluster; its sweet spot is consolidating ageing FAS, mid-range SAN and general-purpose NAS onto QLC flash at sensible £/TB.

Where AFF C400 pulls ahead is data services depth and protocol breadth. ONTAP's SnapMirror, SnapLock, FabricPool, FlexGroup, NVMe/TCP and the Ransomware Recovery Guarantee are genuinely useful for regulated UK workloads — financial services, NHS trusts handling DSPT-scoped data, and any environment that needs WORM for FCA or ICO retention. It is also the only one of the three that natively spans file, block and object in a single chassis, which matters for virtualisation and database consolidation alongside file.

Pick PowerScale F710 if your problem is a single, ever-growing filesystem and you value linear scale-out above all else. Pick FlashBlade//S if you are building an AI/ML or modern-apps platform and want disaggregated scale plus a subscription that absorbs future hardware refreshes. Pick AFF C400 if you are consolidating mixed enterprise workloads — file, block, VMware, and capacity tiers — and want ONTAP's data services and ransomware tooling at QLC pricing. The three rarely compete head-to-head once the workload is properly defined.

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