 |
| leading the way to the
new storage frontier | |
... |
| ..... |
|
the SSD Heresies
how fast can your SSD
run backwards?
are we ready for
infinitely faster RAM?
40 years of thinking
about nvm endurance
RAM
in the post modernist SSD and Memoryfication Era |
|
| ... |
|
| new thinking in SSD
controller techniques reveals "layer aware" properties exploitable in
3D nand flash |
Editor:- August 28, 2018 - A new twist using
RAID ideas in
SSD controllers has
surfaced recently in a research paper -
Improving
3D NAND Flash Memory Lifetime by Tolerating Early Retention Loss and Process
Variation (pdf) by Yixin Luo and Saugata Ghose (Carnegie Mellon
University), Yu Cai (SK Hynix), Erich F. Haratsch (Seagate Technology) and
Onur Mutlu (ETH Zürich) - which was presented at the SIGMETRICS
conference in June 2018.
The authors say that in tall 3D nand (30 layers and upwards) the raw
error rate in blocks in the middle layers are significantly worse (6x) compared
to the top layer. Therefore to enable more
reliable and
faster SSDs using 3D nand for enterprise applications they propose a new type
of RAID which pairs together the best predicted half of a RAID word with the
worst predicted half from another chip in the same SSD.
This new RAID
concept starts to be feasible in a very small population of chips - unlike
traditional 2D nand schemes which need more chips to be installed in the SSD.
The
new RAID is called Layer-Interleaved RAID (LI-RAID) - which the authors
say "improves reliability by changing how pages are grouped under the RAID
error recovery technique. LI-RAID uses information about layer-to-layer process
variation to reduce the likelihood that the RAID recovery of a group could fail
significantly earlier during the flash lifetime than the recovery of other
groups." ...
read the article (pdf)
Editor's comments:- the new RAID is
just one of many gems in this research paper. Others being the discovery that
remanence in 3D nand includes a significant short term charge loss (in the first
few minutes after writes), and also that an endurance based characterization of
a small part of each chip can be used to predict an optimized layer dependent
threshold read voltage for all the layers in the chip. I've discussed the
significance of adding the concept of "layers" to "number of raw
chips" to the thinking in SSD controller design in my recent
home
page blog. | | |
|
... |
|
 |
|
... |
|
|
|
... |
|
| 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?
|
| are we ready for
infinitely faster RAM?
| | |
|
| ... |
|
|
|
... |
|
|
|
... |
|
|
| |
|
|
| ... |
 |
| ... |
|
StorageSearch.com /
SSD history
/ more pages
like this |
| ... |
GreyBeards wrap up Flash Memory Summit
Editor:-
August 26, 2018 - A new podcast -
GreyBeards
talk FMS18 wrap-up and flash trends with Jim Handy, Objective Analysis -
discusses among other things:- the downward trend in nand pricing this year,
competitive tensions in the DRAM business in China and an update on players in
the SCM market.
See related:-
Ray on Storage Blogs,
GreyBeards on Storage
(all), The SSD Guy (Jim Handy's blogs),
List
of Papers (pdfs) presented at Flash Memory Summit
Everspin zaps supercaps in IBM's FlashSystem
Editor:-
August 9, 2018 -
Everspin -
which reported $10.8 million revenue in the quarter ended June 30, 2018 - has
revealed some interesting
developments of its MRAM technology .
- Everspin's MRAM is the new nvm which
IBM hinted it was using in
its recent blogs about the new FlashSystem 9100
Marvell samples first NVMe-oF SSD Converter Controller
Editor:-
August 7, 2018 - Marvell
today
announced
it is sampling a new controller to simplify the design of Ethernet connected
NVMe-oF SSDs.
The 88SN2400 - which is aimed at a EBOF (Ethernet
Bunch of Flash) applications - utilizes a simple, low-power and compute-less
Ethernet fabric instead of a
traditional PCIe
fabric controlled and managed by an enterprise-class server SoC with integrated
100GE controllers.
As an indicator of performance Marvell says that a
typical 2U24 shelf with populated with 88SN2400 attached SSDs can support up
to 18M IOPS. Utilizing a Marvell Ethernet switch that supports 2Tb/s and the
Marvell 88SN2400, data center operators will be able to benefit from a 150GB/s
pipe of pooled storage, and better power consumption per IO compared to general
purpose architectures. The SSD converter controller is optimized for a small
footprint and can be attached to existing backplanes providing ease of service
and eliminating single point of failure. The technology can also be designed
into future Marvell SSD and emerging SCM controllers.
See also:-
the storage interface glue chips
and IP page
NGD Systems demos ASIC version of In-Situ Processing SSD
architecture
Editor:- August 2, 2018 -
NGD Systems today
announced
demonstrations of a new ASIC implementation of controller which is compatible
with its Catalina-2 In-Situ Processing SSD architecture. The NGD Systems
Newport platform has 16 flash channels, NVMe 1.3 PCIe Gen 3.0 x4 storage
compatibility and will be offered in SSDs in a variety of form factors
including M.2.
"Computational storage represents a paradigm shift in analytics
for petabyte-scale data sets," said Nader Salessi,
CEO, NGD Systems. "Our next-generation Newport platform enables
computational storage to 'cross the chasm' from a niche use case to broad market
adoption. In doing so, the Newport platform further enables near-data processing
for real-time analytics on large-scale data sets with improved power and
density, both in watts per terabyte and terabytes per cubic inch. | |
. |
|
|
| . |
 |
| . |
|
| |
| .. |
 |
Megabyte went through
his
Michelangelo phase.
| |
|
.. |
|
| Digital
Storage for Media and Entertainment |
Editor:- August 27, 2018 - Coughlin Associates
today announced the availability of its new (14th annual)
Digital
Storage for Media and Entertainment Report - 2018 - (254 pages, $7,500).
Tom Coughlin
(author and President Coughlin Associates) says...
"The report
benefited from input from many experts in the industry including end users and
storage suppliers, which along with economic analysis and industry publications
and announcements, was used to create the data including in the report. We have
made modifications to earlier reports to better model current market conditions.
As a result of changes in the economics of storage devices higher performance
solid-state storage will play a bigger role in the future. The cloud and
hybrid storage including the cloud will be a bigger part of the media and
entertainment storage market going forward."
Editor's comments:-
Among other things the press release about the new report includes these
interesting observations:-
- By our estimates, professional media and entertainment storage capacity
represents about 4.5% of total shipped storage capacity in 2017
- In 2017 we estimate that 71% of the total storage media capacity shipped
for all the digital entertainment content segments was in HDDs, with digital
tape at 22.7%, 4.3% optical discs and flash at 2.0%. Flash memory dominates
cameras and is finding wider use in post production and content distribution
systems.
- Overall cloud storage capacity for media and entertainment is expected to
grow about 13.3X between 2017 and 2023 (5.1 EB to 68.2 EB)
See
also:- other storage
market research companies,
a timeline of SSDs in tv and
media | | |
|
.. |
|
| SSD news in
Augusts of yore |
- August 2007
- STEC announced it
would ship the industry's first native SAS flash SSDs in Q1 2008.
- August 2012
- Skyera launched
a 1U half-depth 10GbE SSD rack with 44TB usable capacity ($131,000 approx),
3.6GB/s throughput and upto 1 million IOPS using under 800W electrical power.
- August 2015
- Everspin announced
the world's first all MRAM storage module in the M.2 form factor.
- August 2016
- Plexistor showed
it could handle millions of remote writes per second using its persistent
memory over fabric software.
| | |
|
.. |
|
|
|
.. |
|
|
|
|
|
.. |
|
|
|
.. |
|
|
|
.. |
|
|
|
| |
