Wear Estimation for Devices with eMMC Flash Memory
summary
A practical implementation reads eMMC EXT_CSD and the vendor command 56 report to extract per-block erase counts, correlates those counters with kernel I/O events (blk_trace using the complete flag) and feeds a simple linear-regression model. The delivered Flash Analytics tool visualizes device health and shows that a 1024-block eMMC with 3,000 write/erase cycles yields ~3 million block erases (~12 TB total writes); running full-throttle writes can consume that lifespan in weeks, so the tool works for concrete lifetime estimation and optimization.
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chapters (22)
- 0:00Intro
- 1:04WHAT WE'LL COVER TODAY
- 1:44Flash - Non-Volatile Memory of Choice
- 3:39NAND Structure
- 5:31NAND: SLC vs. MLC
- 6:23Trade-Off Between Density and Cost vs. Reliability and Lifespan
- 7:03ECC and Bad Blocks
- 8:34Wear-Leveling and Garbage Collection
- 12:37Write Amplification Factor (WAF)
- 16:26Embedded MultiMediaCard (MMC)
- 17:33MMC Protocol
- 18:02MMC Registers
- 18:28JEDEC Standard Health Reporting
- 20:24Micron Proprietary Health Report
- 23:08Monitoring Flash Health in Linux
- 24:52Vendor Proprietary Health Report 2nd
- 25:09I/O Tracking
- 26:18Block Device I/O Stack
- 28:02Lifespan Estimation
- 29:31Flash Analytics Tool
- 37:15Questions?
- 45:43Remark on Wear Estimation
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