| Autor: |
HUAICHENG LI, PUTRA, MARTIN L., SHI, RONALD, KURNIA, FADHIL I., XING LIN, JAEYOUNG DO, KISTIJANTORO, ACHMAD IMAM, GANGER, GREGORY R., GUNAWI, HARYADI S. |
| Předmět: |
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| Zdroj: |
ACM Transactions on Storage; Feb2023, Vol. 19 Issue 1, p1-33, 33p |
| Abstrakt: |
Predictable latency on flash storage is a long-pursuit goal, yet unpredictability stays due to the unavoidable disturbance from many well-known SSD internal activities. To combat this issue, the recent NVMe IO Determinism (IOD) interface advocates host-level controls to SSD internalmanagement tasks. Although promising, challenges remain on how to exploit it for truly predictable performance. We present IODA, 1 an I/O deterministic flash array design built on top of small but powerful extensions to the IOD interface for easy deployment. IODA exploits data redundancy in the context of IOD for a strong latency predictability contract. In IODA, SSDs are expected to quickly fail an I/O on purpose to allowpredictable I/Os through proactive data reconstruction. In the case of concurrent internal operations, IODA introduces busy remaining time exposure and predictable-latency-window formulation to guarantee predictable data reconstructions. Overall, IODA only adds five new fields to the NVMe interface and a small modification in the flash firmware while keeping most of the complexity in the host OS. Our evaluation shows that IODA improves the 95-99.99th latencies by up to 75×. IODA is also the nearest to the ideal, no disturbance case compared to seven state-of-the-art preemption, suspension, GC coordination, partitioning, tiny-tail flash controller, prediction, and proactive approaches. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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