The applicable published HPE Alletra 9000 configuration guidance specifies a minimum of eight NVMe SSDs per controller-node pair, rather than twelve drives per individual controller. The platform uses enterprise all-flash architecture with redundant controllers and supported RAID 6 protection. Drive-count rules apply to the physical storage layout and controller pair or chassis, so the wording ' installed in the controller node ' can be misleading. Drives must be populated in approved locations using supported types and capacities, with any expansion following the appropriate increment and placement policy. Two drives are insufficient to establish the supported storage layout; eight is the specified minimum in the cited installation rules. The uploaded examination key gives twelve, which is not supported by that published minimum. Hardware models, firmware generations, and terminology sometimes change across HPE releases; the most relevant installation guide and QuickSpecs revision should be used for a live build. The architecture decision must satisfy both resilience and vendor-supported physical population constraints.
Study Guide Reference: HPE Alletra 9000 supported SSD population and RAID protection.
Official reference(s): HPE Storage Solutions course
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