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jerry311
nagyúr
Szvsz, a gyártók nem költenének rá, ha nem lenne szükséges.
De benne van a doksiban is:
TLDR: a NAND méret csökkent, a controller bonyolultsága nőtt, és az ECC nem volt elég, kellett a RAIN.
ECC Is No Longer Enough to Protect NAND in SSDs
Like HDDs, SSD devices also have the potential for
failure and data loss. The original method for protecting
data in SSD designs was simply to add the required levels
of error correction code (ECC) to the given pages and
then recover data using ECC. When the first SSDs were
shipped, this initial level of protection was sufficient to
minimize the chance of failure, much like with the early
HDD products.
But as NAND geometries continue to shrink, and control-
ler complexity increases, a protection scheme beyond
simple ECC is needed—like RAID was needed for HDDs.
Similar solutions to protect the user data in SSDs have
emerged as the market matures, but unlike with HDD
arrays, where the industry collectively settled on a very
few specific versions of array-level RAID implementations
(most commonly, single-bit parity RAID 5 and double-bit
parity RAID 6—both rotating), SSDs utilize approaches at
the device level. Thus, no two versions of SSD data protec-
tion technology are guaranteed to be exactly the same.
With many competitive architectures being created by
multiple SSD manufacturers, it is important to understand
the details of the approach being used. These details can
be thought of as tools in the SSD designer’s toolkit and
can be tuned and adjusted to best match the SSD design
to the intended use, workload, endurance, and a host of
other factors.
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