Clock2Q+: A Simple and Efficient Replacement Algorithm for Metadata Cache in VMware vSAN
Summary: Clock2Q+ adds a correlation window to a three-queue cache, filtering burst-correlated metadata hits to prevent cache pollution while retaining hot-block promotion. Its VMware vSAN deployment combines strong miss-ratio gains with simple, scalable low-overhead design. (summarized by gpt-5.6-luna on Aug 28 2026)
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Authors
- 1. Yiyan Zhai (Carnegie Mellon University)
- 2. Bintang Dwi Marthen (Harvard University)
- 3. Sarath Balivada (Broadcom Inc.)
- 4. Vamsi Sudhakar Bojji (Broadcom Inc.)
- 5. Eric Knauft (Broadcom Inc.)
- 6. Jitender Rohilla (Broadcom Inc.)
- 7. Jiaqi Zuo (Broadcom Inc.)
- 8. Quanxing Liu (Broadcom Inc.)
- 9. Maxime Austruy (Broadcom Inc.)
- 10. Junlong Gao (Broadcom Inc.)
- 11. Wenguang Wang (Broadcom Inc.)
- 12. Juncheng Yang (Harvard University)
BibTeX Citation
@article{zhai_vldb26,
title = {{Clock2Q+: A Simple and Efficient Replacement Algorithm for Metadata Cache in VMware vSAN}},
author = {Zhai, Yiyan and Marthen, Bintang Dwi and Balivada, Sarath and Bojji, Vamsi Sudhakar and Knauft, Eric and Rohilla, Jitender and Zuo, Jiaqi and Liu, Quanxing and Austruy, Maxime and Gao, Junlong and Wang, Wenguang and Yang, Juncheng},
journal = {PVLDB},
series = {{VLDB} '26},
volume = {19},
number = {12},
pages = {3874--3887},
doi = {10.14778/3827998.3828002},
url = {https://doi.org/10.14778/3827998.3828002},
year = {2026}
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Outgoing Citations (Sorted by Pagerank)
Showing 5 of 5 cited papers.
Citations counted here include only citations to other VLDB/SIGMOD/CIDR/PODS papers in this database.
| Rank | Cited Paper | Year | Venue | Pagerank |
|---|---|---|---|---|
| 128 | An Evaluation of Buffer Management Strategies for Relational Database Systems | 1985 | VLDB | 0.00030411805 |
| 212 | The LRU-K Page Replacement Algorithm For Database Disk Buffering | 1993 | SIGMOD | 0.00024767296 |
| 593 | 2Q: A Low Overhead High Performance Buffer Management Replacement Algorithm | 1994 | VLDB | 0.00015836342 |
| 6,170 | Index Access with a Finite Buffer | 1987 | VLDB | 5.862438e-05 |
| 11,042 | Demystifying and Improving Lazy Promotion in Cache Eviction | 2026 | VLDB | 4.9793485e-05 |
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