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SSD endurance myths
and legends |
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We all know (or think we
know) that drinking a bottle of vodka every day might reduce your longevity
prospects.
And maybe smoking 200 cigarettes a day should have the
same negative effect too.
But then we heard the story about that
Russian peasant who's been living in the mountains on a diet of vodka,
cigarettes and freeze dried goat - who sneaked down to the village to ask if it
was safe to move back.
Is Lenin dead yet? - he asked.
He had been asking that
very same question every Spring for over 90 years.... |
razzle dazzling flash SSD
cell care and retirement | | |
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If you could go back in
time and take with you a factory full of modern memory chips and SSDs
(along with backwards compatible adapters) what real impact would that have?
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are we ready for
infinitely faster RAM?
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Choosing a slow interface
for a high capacity SSD is the route whereby one innovative enterprise SSD
maker was able to offer "no limits DWPD". |
what's
the state of DWPD? | | |
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Enterprise DRAM has the
same latency now (or worse) than in 2000. The CPU-DRAM-HDD oligopoly
optimized DRAM for a different set of assumptions than we have today in the
post modern SSD era. |
latency loving
reasons for fading out DRAM | | |
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Why can't SSD's true
believers agree upon a single coherent vision for the future of solid state
storage? (They never did.) |
the SSD Heresies. | | |
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The memory chip count
ceiling around which the SSD controller IP is optimized - predetermines the
efficiency of achieving system-wide goals like cost, performance and
reliability. |
size matters in
SSD controller architecture | | |
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forcing
endurance stress helps reliability assessment of 3D nand |
For 40 years we got so used
to the idea that early wear out in flash is a bad thing and excessive writes
were something to be avoided or mitigated - especially before the SSD had even
shipped to the customer.
But a research paper in August 2018 showed how
deliberately wearing out a small number of blocks in 3D nand flash (using 10K
P/E cycles) can be used as a tool to help calibrate the memory and measure
parameters which can be used to increase the reliability of the remaining flash
blocks using new architectural techniques.
For more about the paper
and architectural aspects see
3d
nand and new dimensions in SSD controller architecture | | |