28.02.2016., 00:10
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#368
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Datum registracije: Aug 2010
Lokacija: D.Zagora
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SSD reliability in the real world: Google's experience
Key conclusions
- 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.
http://www.zdnet.com/article/ssd-rel...es-experience/
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