- Ignore Uncorrectable Bit Error Rate (UBER) specs. A meaningless number.
- Good news: Raw Bit Error Rate (RBER) increases slower than expected from wearout and is not correlated with UBER or other failures.
- High-end SLC drives are no more reliable that MLC drives.
- Bad news: SSDs fail at a lower rate than disks, but UBER rate is higher (see below for what this means).
- SSD age, not usage, affects reliability.
- Bad blocks in new SSDs are common, and drives with a large number of bad blocks are much more likely to lose hundreds of other blocks, most likely due to die or chip failure.
- 30-80 percent of SSDs develop at least one bad block and 2-7 percent develop at least one bad chip in the first four years of deployment.
Be warned that this is mostly just a collection of links to articles and demos by smarter people than I. Areas of interest include Java, C++, Scala, Go, Rust, Python, Networking, Cloud, Containers, Machine Learning, the Web, Visualization, Linux, System Performance, Software Architecture, Microservices, Functional Programming....
Friday, 18 March 2016
SSD reliability in the real world: Google's experience | ZDNet
SSD reliability in the real world: Google's experience | ZDNet:
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hardware
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