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Starting in PowerStoreOS 3.0, the PowerStore 500, 1200, 3200, 5200, and 9200 model systems support 24-drive 2U NVMe expansion enclosures using 2.5-inch NVMe SSD drives for extra capacity. NVMe expansion enclosures do not support NVMe SCM drives. The base enclosure can support all NVMe SSDs or a mix of NVMe SSDs and NVMe SCM drives (for metadata tier) with an NVMe expansion enclosure attached. Before attaching an NVMe expansion enclosure, all drive slots 0 to 21 in the base enclosure must be populated. Each appliance in a PowerStore cluster supports up to three NVMe expansion enclosures. For more information, see the document Dell PowerStore: Introduction to the Platform.