Graceful Degradation for the QLC Era: Moving SSD Lifecycle Management to the Host

As QLC NAND densities continue to increase and cell geometries shrink, die and block failure rates have become a dominant operational concern at datacenter scale. Traditional SSD firmware manages these failures as a "black box," internally consuming spare blocks until exhaustion leads to abrupt drive retirement—often while 99% of its media remains functional.
This session introduces Host-Managed Over-Provisioning (HM-OP), a cooperative architectural shift that moves lifecycle decisions from firmware to the host filesystem. Unlike Flexible Data Placement (FDP), which optimizes for write ingest, HM-OP focuses on lifecycle optimization by allowing drives to "gracefully shrink" in capacity rather than fail.
We will provide a technical deep dive into the HM-OP workflow, including:
 •  Health Telemetry: Utilizing 90/30/7-day power-off retention counters and real-time spare block visibility.
 •  The Cooperative Handshake: How the host orchestrates proactive data evacuation from degrading regions.
 •  Capacity Shrink Mechanisms: Implementing host-initiated MAX_LBA reduction to reclaim performance and extend drive longevity.
 •  System Integration: Managing unpredictable die failures through hole consolidation and cluster-level erasure coding.
Attendees will leave with an understanding of the proposed NVMe extensions required to standardize this transparent management model and how shifting to a "managed expense" model for wear-out can significantly improve TCO for modern flash deployments.