Could We Make SSDs Self-Healing?
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1 Could We Make SSDs Self-Healing? Tong Zhang Electrical, Computer and Systems Engineering Department Rensselaer Polytechnic Institute Google/Bing: tong rpi Santa Clara, CA 1
2 Introduction and Motivation Hot Topic NAND Flash Registers & Cache CPU Main memory Hard disk 100nm Bit cost reduction 10nm Santa Clara, CA 2
3 Introduction and Motivation Error Rate Endurance Retention X Noisy NAND Flash Y Tb/in 2 Increasingly noisy media Hard disk drive Santa Clara, CA 3
4 In-Depth Knowledge of Storage Media Hard disk drive X Controller & W/R channel Controller & W/R channel Y Bit response Device characteristics Non-linear distortions Media defects Head noise Media noise BPM HAMR MAMR TDMR Santa Clara, CA 4
5 In-Depth Knowledge of Storage Media Solid-State Storage X Controller & W/R channel Controller & W/R channel Y Device characteristics Write latency Read latency Erase latency Endurance Redundancy Painless system designers life Lost system optimization opportunities Device-Aware SSD System Design Santa Clara, CA 5
6 Device Wear-Out Program Erase Modulate transistor threshold voltage Program/erase (P/E) cycling Accumulates charge traps 1. Larger random telegraph noise 2. Larger threshold voltage degradation during retention 3. Larger program/read disturb Smaller noise margin Santa Clara, CA 6
7 Device Wear-Out 2bits/cell Noise margin Noise margin Threshold voltage (fresh memory cells) Threshold voltage (after program/erase cycles) P/E cycling endurance Noise margin ECC tolerance limit P/E cycling Santa Clara, CA 7
8 Device Wear-Out Recovery Oxide trap Interface state trap Recover over time P/E cycling Time Noise margin Temperature Recovery speed Santa Clara, CA 8
9 Self-Healing SSD? Explicitly leverage this device wear-out recovery phenomenon in FTL Re-think of how to utilize existing over-provisioning? Keep track of the history of environment temperature Intentionally operate SSDs under higher environment temperature Write speed Inherent wear-out recovery Retention Endurance Most Aggressive Scenario 3D-enabled self-heating flash chip Flash dies Heater die Santa Clara, CA 9
10 Self-Healing SSD? Flash dies Heater die Improve P/E cycling endurance Improve write speed Increase retention time backup backup backup backup Self-heating Self-heating Santa Clara, CA 10
11 A Preliminary Evaluation Improve P/E cycling endurance Heating time Thermal modeling Heating energy Self-healing SSD simulation Flash cell modeling Cell-to-cell interference Random telegraph noise Retention noise SSD system modeling Impact of data backup on system performance Santa Clara, CA 11
12 Thermal Simulation Setup HotSpot thermal modeling 3D chip structure 3D chip setup Santa Clara, CA 12
13 Thermal Simulation Results 1.5W to 5.1W power consumption when temperature changes from 110 to 250C Choose 200 C as the target heating temperature ~35 minutes for 80% interface state traps to recover Santa Clara, CA 13
14 P/E Cycling Endurance Improvement Allowable worst-case memory read raw BER of 2.04e-3 10-year retention limit Include trap recovery under normal temperature (45 C) Self-healing trigger BER 1.50e-3 Three times longer cooling time P/E cycling endurance: Santa Clara, CA 14
15 Data Backup During Chip Self-Heating SSD Controller ECC Host ECC ECC ECC Santa Clara, CA 15
16 Data Backup During Chip Self-Heating Backup start I/O request 1B 1B 1B 1B 1B 1B 1B 1B xxxb 1B 1B 1B 1B 1B 1B Initialize data backup when SSD is idle I/O request can interrupt data backup operation Impact of data backup granularity on I/O request response time Need to handle read and write conflict Santa Clara, CA 16
17 Simulation Setup DiskSim simulator with SSD model patch 2 dies/chip, 8-bit I/O bus and a number of common control bus 2 planes/die, 2048 blocks/plane, 64 pages/block, 8 sectors/page, 512bytes/sector 2 channels, 17 flash chips/channel including one backup chip Backup chip on each channel only backups the data of the flash chips on the same channel ONFI 2.0, 133MB/s, read access time 50μs, program time 600μs Santa Clara, CA 17
18 Simulation Setup Santa Clara, CA 18
19 Summary Continuous technology scaling demands true device-aware SSD system design How to exploit memory cell wear-out recovery? Explicitly leverage this wear-out recovery phenomenon in FTL A more aggressive scenario: self-heating NAND flash memory chips o SSD controller scheduling and data backup strategy o Simulation based on detailed thermal, flash memory cell, and SSD system modeling Comprehensive cross-layer optimization: an open question Santa Clara, CA 19
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