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Gandalf extends SSD lifetime by 7.3x for LLM KV cache offloading

·2026.10.26 09:46

Key point

The system prioritizes full-attention KV cache admission to reduce SSD wear without sacrificing cache hit rates.

Details

  • Proposes Gandalf, the first SSD KV cache offloading system with SSD lifetime awareness, addressing the issue where KV cache writes shorten SSD life from years to months.
  • Extends SSD lifetime by 7.3x on average while maintaining negligible impact on cache hit rate across multiple workload traces.
  • Uses application-level information, specifically attention type, to prioritize the admission of full-attention KV cache over other types, avoiding the hit rate penalties of pure access-pattern gating.
  • Design is extensible to other flash-based storage technologies, including High Bandwidth Flash (HBF).
llm-servingstoragekv-cacheinference-optimizationarxivssd-wear
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