smr-persistent-cache · shipping · also SMR media cache

SMR persistent cache

An SMR persistent cache is a nonvolatile staging area that holds updates before they are incorporated into their target shingled regions.

This is distinct from volatile write caching [2]. Skylight inferred separate limits for journal allocation, payload space and mapping entries on its tested drives; those inferred values are not specifications for other models [1]. The linked analysis provides synthetic resource arithmetic, not a device benchmark [3].

Relations

related

device-managed-smr, garbage-collection-smr, shingled-band

Limitations

• A capacity bound does not predict stall time, firmware cleaning thresholds or the cause of a failed command. [3]

Citations

1. Aghayev and Desnoyers: Skylight, FAST 2015, sections 4.5-4.6 (accessed 2026-10-15)
2. Zoned Storage: Shingled Magnetic Recording Hard Disks (accessed 2026-10-15)
3. Hesela: SMR stalls, cache limits and the errors SMART can miss (accessed 2026-10-15)

JSON: /data/terms/smr-persistent-cache.json