nvme-reclaim-unit-handle · limited · also FDP reclaim unit handle, RUH

NVMe reclaim unit handle

An FDP controller resource that references one reclaim unit in each reclaim group of an endurance group.

Related Observatory article: NVMe reclaim unit handle on hesela.com

A namespace-scoped placement handle maps to an endurance-group-scoped RUH. [1] A handle can switch to another RU when its current unit fills; it is not a permanent physical address. [2] Initially Isolated and Persistently Isolated handle types have different rules for preserving segregation during controller relocation. [3]

Relations

related

nvme-fdp, nvme-reclaim-unit, nvme-placement-identifier, namespace-nvme

Limitations

• An RUH does not by itself promise permanent physical isolation from every other workload. [3]

Citations

1. NVM Express Base Specification 2.1 (5 August 2024), sections 1.5.73-74 and 1.5.82-84: FDP terminology. (accessed 2026-10-12)
2. NVM Express. Flexible Data Placement Overview, FMS 2023, slides 6-7 and 16-23. Historical architecture overview, not a current software-support matrix. (accessed 2026-10-12)
3. Samsung. Getting Started with Flexible Data Placement, v4, sections 4.1.1 and 6.1. Vendor implementation guide. (accessed 2026-10-12)

JSON: /data/terms/nvme-reclaim-unit-handle.json