Advancing Flash Storage
summary
Meta deploys high‑density QLC racks with a co‑designed solution from Pure Storage that pushes SSD smarts into direct flash software and simple DFMs to hit density and power targets. A single DFM scales to about 600 terabytes while the software reduces write amplification by exposing many virtual volumes for lifetime packing, uses distributed local parity to rebuild failures without cluster traffic, and increases IU to 512 kilobytes, cutting metadata to ~8 GB per petabyte and sustaining ~20 GB/s per petabyte.
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chapters (8)
- 0:00Flash storage challenges
- 2:10QLC flash as middle tier
- 3:55Optimizing QLC for servers
- 4:59Meta and Pure Storage co-design
- 7:26QLC endurance challenges
- 8:52Error rates in QLC SSDs
- 9:56Memory constraints in QLC
- 11:23Future of QLC in data centers
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