Israeli startup Anobit has introduced a Genesis SSD which lasts for five years when writing 4TB of data a day. Anobit uses memory signal processing (MSP) technology, based on digital signal processing technology to extract usable signals from multi-level cell (MLC) flash cells that other controllers would consider worn out and …
How many of these things have been tested actually writing 4TB/day over five years, in the real world? Of the number tested, how many have failed?
Inquiring minds, and all that ...
Have I missunderstood?
4TB of data a day written on a 400GB flash is 10 writes per byte each day. Over 5 years that is an endurance of 18,250 writes. Is that considered exceptional?
Math isn't your friend is it?
Boring Bob's math is correct:
4TB per day is 46.3MB/s or roughly 25% max write bandwidth
46.3MB/s * 5 Years / 400GB = 18,251 write/erase cycles endurance
Not very impressive, but that is above average for MLC.
Considering that (most) MLC manufacturers consider their 22nm/34nm MLC NAND having a 5,000 write/erase cycle lifespan, 18,251 is quite exceptional. Definitely a boon for Enterprise markets, but hardly useful over traditional flash for consumer markets.
Lets use real world Math
Assume that in the future these drives will mostly be used in tiered storage scenarios to provide suffcient io in front of a sata bunch (or marketing-speech "nearline-sas", sounds faster but isnt).
Then writes will go down on ssd but some algorithm will stage data to tier 2/3 from time to time. so the ssd will never fill up to its maximum. Lets say half the disk will be filled before the data is staged. You end up with 36.000+ ios per cell, right? Does it mean it will just last 2.5 years?
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