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... |
Unlike human cures for baldness which are applied when the symptoms start to appear
- SSD baldness cures have to be applied from birth. And the strength of the
tonic has to increase with age to get the best results.
| |
|
| ... |
| calling all MLC memories! |
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| ... |
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| ... |
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| . |
| "The argument is shifting
from which type of flash memory is best? - to whose SSD controller and flash
management scheme do you believe is best?" |
| sugaring MLC flash
for the enterprise - Unlike the Cola Wars - you can't afford the risk of a
bad enterprise MLC SSD taste test. | | |
| . |
| "...flash endurance
declines at high operating temperature - so low power consumption in SSD racks
is a reliability feature..." |
| inside the design of a
fast HA SSD - I spoke to Holly Frost, CEO and Dan Scheel,
President of Texas Memory Systems - about their fast high availability SSD
and the philosophy that steers the design . | | |
| . |
| "...flash wear-out
remains a reliability risk in badly designed SSDs and also in SSDs which are
deployed in the wrong type of application - compared to that for which they were
designed." |
| SSD endurance -
even after more than 8 years writing about flash SSD endurance this subject
remains 1 of the top topics for readers. | | |
| . |
| "You have to be careful
about swallowing any new pills just because you found they got a good write-up
on the internet. And it's the same with SSDs too." |
| SSDs as computer tonics
- for SSD users - the risk of flash SSD wear-out due to ineffective endurance
control is like that of influenza. Just because you've already had it before -
or been inoculated against the previous strain doesn't mean you are invulnerable
to what may happen in the next flash / flu pandemic. | | |
| . |
| "Write/erase cycle
endurance for solid-state storage is specified in many ways by many different
vendors making it difficult to make an "apples to apples" comparison
of write/erase endurance by solely relying on these numbers in a datasheet. A
better way to judge endurance is to break the specification down into the main
components that affect the endurance calculation." |
| Increasing Flash SSD
Reliability - as Oddball (Donald Sutherland) says in the movie Kelly's
Heroes "I ain't messing with no tigers." | | |
| .. |
| new cell design with heater
gives 10,000x better endurance |
| In December 2012 -
Macronix
described an experimental design of flash cells with on-chip annealing super
heaters - which the company said could be used to refresh endurance to over
100 million cycles. | | |
| .... |
| "Inside the brain of the
SSD - a nerve ending tugs to say - forget your other priorities pal - the power
rail is going down. Is this the end of this promising young SSD's career? Will
data will get corrupted?" |
| Surviving SSD
sudden power loss - If you've ever watched the movie Black Hawk Down -
there's a memorable scene in which Super 64 has its tail hit by an RPG and
becomes the 2nd chopper to go down. | | |
| .. |
| "STEC has discovered that
MLC flash endurance is a more elastic concept than most experts previously
believed." |
| the new SSD uncertainty
principle - resetting the assumptions about enterprise MLC flash - the
deliverable benefits of STEC's CellCare Technology | | |
| .. |
| "Classical enterprise
storage such as hard drives and RAM SSDs had truly symmetrical behavior which
was a result of the underlying technologies. In contrast - nand flash (which
includes most SSDs on the market today - such as SLC, eMLC, MLC and TLC) have
important R/W asymmetries which impact SSD operational behavior." |
| how fast can your SSD
run backwards? - 11 Key Symmetries in SSD design. | | |
| .. |
| "In simple language - you
don't always read out the same digital value that you wrote in. Because the
variation and tolerances in the end to end read write process are greater than
the thresholds between the logic levels." |
| Unveiling XLC Flash SSD
Technology - XLC's founder refers to MLC as "dumb first generation
multi level flash" and XLC as the "multi level flash of the future." | | |
| . |
| "ECC techniques are
well-defined (typically using BCH or Reed Solomon algorithms), but SSDs need
more sophisticated ECC protection." |
| Data Integrity
Challenges in flash SSD Design - The 4 methods that can be used to maintain
data integrity in enterprise-class flash SSDs are... | | |
| . |
| "In flash devices 2% to
10% of blocks may be error prone or unusable when the device is new. And after
that data in "good blocks" can later be corrupted by charge leakage,
disturbance from writes in adjacent parts of the chip, wear-out and variability
in the tolerances of the R/W process in MLC SSDs." |
| principles of bad
block management in flash SSDs - SSDs are only as good as the people who
design them and make them. There can be orders of magnitude difference in
operational outcomes - even when different SSD makers are using exactly the same
memory chips. | | |
| . |
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| . |
| ""SMART's trick with
the SandForce controllers is like using Dolby correction with a 1980s cassette
tape. Whereas SMART's trick with its Optimus controller is like having a
built-in dynamic sound equalizer..." |
| SSD news - April 26,
2012 - SandForce driven SSDs get 5x SMARTer | | |
| . |
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| . |
| "... I got an email from a
reader who told me that out of 13 client SSDs he'd bought 7 months ago "4
have died so far."" |
| Why can consumers (still)
expect to see more flaky flash SSDs? - SSDs aimed at the consumer market
are designed to deliver basic functionality at the lowest price. That means the
designers have to decide what shortcuts they can take... | | |
| . |
|