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7 SSD types - all you need
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into the infrastructure sooner will be seen as a good thing by users."|
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Memory Channel Storage SSDs
will the new concept fly?
should you book a seat yet? by
editor - April 29, 2013
been hearing more details about the implementation plans for a new type of
fast enterprise SSD.
Memory channel storage was devised by Diablo Technologies.
While in stealth mode Diablo had hinted it was planning to use its
assets and expertise in DRAM interface chips and datacomms to design a new
type of enterprise SSD which would couple - the capacity cost advantages of
flash with the low latency characteristics of a RAM "bus" to
create a new type of fast storage device which would be an order of magnitude
faster at accelerating apps than
good old PCIe SSDs.
To make a product like this viable will require world leading skills
in flash controller and management expertise - with particular emphasis on
expertise in enterprise SSD markets.
Diablo last week announced that
it has chosen SMART
to exclusively supply the necessary flash SSD expertise.
companies will work together to bring the first products to market in the coming
year. The products will be sold by SMART.
At this point you may well
What does a
rooted company like Diablo (because that's where the founders came from)
know about SSDs?
We'll have to see as details emerge later. However,
in past conversations I've had with people in enterprise SSD array pioneer
Texas Memory Systems
(acquired by IBM) - TMS
had characterized their big controller SSD architecture as being primarily "a
router" which could move data reliably from a SAN into a memory array with
low latency, fast throughput and good
And another place we've been seeing datacomms concepts entering the
SSD market recently is in the field of adaptive DSP and ECC techniques - most
explicitly in the nomenclature of controller and IP products from
DensBits - whose "memory
modem" approach uses the philosophical idea that charge based R/W errors in
flash cells can be modeled and managed in similar ways to signal noise in
(Diablo's flash partner).
If you're not already familir with SMART - a
quick summary is to say they are a
Top 20 SSD Company,
which is a leading supplier in the
SAS SSD market, and has
its own adaptive
R/W flash ECC IP and its own enterprise SSD controllers. SMART doesn't
have a PCIe SSD product line. So you might think that was a strange partner
choice - but I'll be returning to this question later in this article.
spoke recently about the market opportunity and technical challenges posed by
memory channel SSDs with John Scaramuzzo,
President of SMART.
A small part of the article which follows here -
is based on that discussion. But most of the article below is based on my own
thoughts - inspired by the kind of questions which I know many of you would
ask. These speculations are based on my own analysis of the
different between this and past flash SSDs in DRAM packages?
and I briefly discussed why you shouldn't confuse memory channel SSDs with past
attempts by memory makers to place flash SSDs in DRAM style DIMM packages.
two best known companies who have gone down that route are
Micron - in whose DRAM
compatible flash products the flash is used as a backup for DRAM which
triggered into operation by a
drop in the
power supply. There have also been DIMM flash SSDs which were mounted
on the motherboard in a DRAM package - but where the data was connected via
another interface such as SATA
- and not through the DRAM bus.
Another phrase which SMART likes to use
in relation to the Diable technology is "ultra low latency" SSD. John
told me the purpose of the ull SSDs was to provide latency an order of
magnitude faster than existing PCIe SSDs.
ULL SSDs - PCIe SSD
killers or collabrative co-workers?
One question I asked gave me
a picture of how the PCIe SSD market might look - even if we rushed ahead and
assumed that ULL SSDs were successful beyond the wildest dreans of
their creators (which as we'll see later - stretches a lot of assumptions).
asked - how many inches in physical distance can the memory channel SSD bus be
routed? And specifically - can it hop off the motherboard?
John said -
no that's not the idea. The current concept is to be operate the same as a DRAM
So I could immediately see 2 levels of segmentation and
co-existence with PCIe SSDs - which can occur - even if we assume that every
fast server has memory channel SSDs installed.
- 1st level of market co-existence:- is high performance server clusters -
where PCIe SSDs effectively provide the next level of SAN-like data connectivity
tolerance functionality using PCIe fabric technology.
- sharing data between different physical servers at low latency - is
something which PCIe SSDs can do which DRAM memory technology can't (yet).
way to think about this is - what's the best way for one memory channel storage
accelerated server to talk to another? The answer is via a switched PCIe SSD
That's my analysis of what would happen - even if the new
technology was wildly successful.
- 2nd level of market co-existence - is entry level to mid-range server
For example - in cost sensitive server markets like
because the memory management technology needed to implement a Diablo-style ull
SSD will be more expensive to implement than entry level fast-enough PCIe SSDs -
which don't need such fast SSD
controllers and don't need RAM caches or nvRAM caches - each of which
escalates upwards the floor price of the ull SSD.
fast-enough PCIe SSDs will always be cheaper than the cheapest memory channel
John also confirmed that he saw these
as different markets. And for example - at some future date - when there's an
adequate set of industry standards for PCIe SSDs - you can still expect that
SMART might bring to market its own family of PCIe SSDs.
For many of
you - that's the key message from this article - and you don't need to read any
further. I'll say it simply here...
Memory channel SSDs will not
remove the need or market desireability of PCIe SSDs.
cases it's possible to imagine servers in which both types of SSDs are operating
(in different functional roles) at the same time. And in my view - the market
opportunity for PCIe SSDs will remain much bigger - because it can be adapted
more economically for a wider spectrum of performance.
This brings us
to the next 2 big questions and problems about bringing ull SSDs to market -
flash technology and controller technology
technology and ull SSDs
Without giving too many details away John
told me that getting the memory technology optimized for the low latency and
high IOPS of ull SSDs was going to be a tough challenge.
If you look at
problem for a very fast SSD of this type - the demand pushes you in the
direction of SLC like characteristics.
The latency can only be met by
true DRAM or nvRAM like memory.
John told me - they weren't in this
venture with Diablo only to design a product which worked. The product had to be
affordable too. Therefore it has to be flash rich.
If I step back and
speculate what performance might be needed in this new type of SSD - it's way
beyond what SMART implements in its SAS SSDs.
On the other hand -
adaptive R/W flash IP (of the type which SMART has) can be tweaked to deliver
And if you look at the
rackmount SSD market
- Skyera shows you
can get very high system performance and reliability by using adaptive R/W
alongside nvRAM cache.
In fact - if you look at a technology roadmap
for future flash memory and SSDs - it would be a mistake to launch the new
memory channel SSDs using an SLC based implementation - because apart from the
cost penalties - SLC doesn't have a geometry scalable future. When you shrink
it - it picks up all the baggage of problems of MLC. So MLC and adaptive R/W is
the only way to go. (That's true for
too - and not just in the
My guess is that Diablo must have realized that when they
were looking at the long range memory future. And that's one of the reasons
they picked SMART.
SMART is currently one of the leading companies
which spans both adaptive R/W technology and has enterprise SSD market
experience but doesn't yet have the inconvenient distraction of having a
PCIe SSD product line.
SMART's controller performance problem
current SSD controller technology (as publicly revealed) can simply be
described as fast enough for the purposes of
2.5" SSDs - which
it was designed for - but nowhere near fast enough compared say to fast PCIe
SSDs such as those from
how's SMART doing to fill the controller gap to deliver fast ull SSDs?
is my speculation here and not based on anything said to me by anyone in SMART.
But there are several ways you can look at this problem....
and bundling the technology which aleady exists.
OCZ was the first company
which demonstrated that you can design very fast throughput PCIe SSDs by using
arrays of controllers which had been designed for 2.5" SSDs. In OCZ's case
their original PCIe SSDs included arrays of
SandForce controllers -
and are now available using arrays of their own OCZ controllers.
approach (using multiple Guardian controllers) would be feasible for SMART to
use in new ull SSD too. It would need a
fat RAM cache
to deal with latency and endurance peaks. But it's not the most
When you get into the fast enterprise SSD club you start seeing
controller designs which have similar
designs tend to split the controller design into different partitions - an
intelligence and host / apps leaning side and a distributed flash management
My guess is that new ull products from SMART could be
eASIC or FPGA heavy implementations rather than simply arrays of their Guardian
controllers. That's because when you own the algorithms and IP - you aren't tied
to past implementations of how you packaged it. You can implement the functions
in any way that makes best sense for the market you're going for.
doesn't really matter which way SMART does it as long as it's fast enough and
The host interface and high end memory controller /
CPU IP side of things is where it would be natural to assume that Diablo will
be contriibuting their own IP.
how successful will memory channel
SSDs / ull SSDs be?
This is where we can return to some important
First of all - in looking at what problem these
new SSDs might solve which isn't being solved today - an important thing to
realize is that the competitive environment isn't the same as when Fusion-io
started shipping PCIe SSDs back in
new ull SSDs have to fight for a viable toehold in an already pre-existing and
very sophisticated market
for enterprise SSDs.
And even though the state of the SSD software
questions open to debate the importance of
software in the SSD market
as a sales accelerator is well established and well understood - even if mostly
by the high sums that such companies have been
acquired for -
relative to their modest revenue achevements as standalone ISVs.
can get some interesting insights into this by using the mental trick I call
boundaries analysis and rephrasing some of the assumptions about the new
technology to get these sanity checks.
- if Fusion-io was
the flash technology partner for Diablo (instead of SMART - and forgetting about
the very material facts that
FIO doesn't admit
publicly to having the same flash technology and also has a
very different approach to
everyone else when it comes to SSD controller design) what could Fusion-io
deliver with a memory channel connected SSD that it can't already deliver with a
FIO has demonstrated in market shipping products that
shrinking down latency requires more than hardware design.
You need to
remove layers of hard drive related junk which is hard coded into many layers of
enterprise systems software. But when you do this - sometimes by introducing new
side-stepping APIs - you can get apps performance which is 10x faster than raw
speedup which you get from simply running legacy software faster on SSDs.
is something which academic researches at the
Non Volatile Systems Lab UCSD have also
written about too.
Fusion-io is already well down this learning curve
- and if they had the benefits of a lower latency to memory technology - my
guess is they would be best placed to further exploit it. Having said that,
however, until we know what the Diablo/SMART memory channel controller latency
delivers - we can't be sure how it will compare to what FIO already delivers
with the worse latency of PCIe but better latency of a flash translation layer
in which the apps server is the same CPU that manages the flash.
memory channel SSD concept - if the product is fast enough and affordable - will
find a market if it can exceed the kind of server cost / performance which
you can only get today by using Fusion-io's PCIe SSDs with Fusion-io's APIs -
but in a business model which is independent of Fusion-io.
- if SMART were
simply to come to market with a new fast PCIe SSD (instead of a new type of
SSD) it would struggle and probably fail to establish a market for such a
product. If and when SMART does introduce its own PCIe SSD my guess is it would
be a fast-enough product optimized for cost and efficiency rather than speed.
But that's another story.
Without a software base - simply having a
lower latency PCIe SSD wouldn't get you many customers today.
One of the
problems for the Diablo / SMART ull SSD market is the lack of a spohisticated
SSD ecosystem. That's a problem which faces any new type of SSD. My guess is
that a critical part of Diablo's business model will have to be invested in
showing how the new SSD type can side step those difficult "SSD" type
integration questions - by delivering a product which looks to applications
transparently like a bigger cheaper type of DRAM.
The idea of selling
flash as a memory tier has long been on the agenda of leading PCIe SSD
Virident - but
the physics of flash and the characteristics of the the interface have meant
that it's not been possible to do this without a lot of software being
introduced into the mix. And the enterprise market is traditionally cautious
about relying on single source solutions.
So - who are the first
customers for these new ull SSDs likely to be?
Until the first
products come to market we have to guess at their possible characteristics.
If you've been following my flow until now - my guess is the first
memory channel SSDs will need to be fast SSD with apps acceleration in a
similar class to using Fusion-io PCIe SSDs (and APIs).
But the memory
channel SSDs will have a completely different software architecture. The
possibilities range from a very light software support set in which the new SSDs
are initiated in the server to look like a big RAM. Or maybe some SSD-like
software in which the modules look like a traditional SAS drive.
the details may be completely different.
Who would be the ideal
customers for such products? - It's going to be very tech savvie customers for
whom pushing the boundaries of performance is worth the risk of investing in new
technology because they use or sell thousands of servers. So it will be
dark matter SSD users,
SSD appliance makers and traditional server oems.
always fun to speculate about the likely impact of new SSD technologies and
changes in market directions.
As the above article is mostly based on
speculating about a single new product line it's almost certain that in many
detailed respects it will be wrong.
Nevertheless I think that the
safe conclusion - which is almost where I started - is that even if memory
channel / ull SSDs are successful in the market there are many ways to see
how in the next 2-3 years they can still coexist with several different types
of PCIe SSDs.
For related info see these articles and guides:-
PCIe SSDs news
RAM market news
SSD controllers and flash
aren't all the same
chips and IP in the SSD market
an introduction to
enterprise SSD silos
|It looks like you're seriously interested
in SSDs. So please bookmark this page and come back again soon. |
you've got the time - you might want to take a look at
the top 100 most
popular SSD articles seen by our readers in recent months.
|About the publisher - 21
years guiding the enterprise market||....
|"Old, heavily written
MLC cells - managed by traditional endurance schemes - can get slower as they
get older - due to higher retry rates on reads - even though the blocks are
still reported by the controller logs as being good. That means the SSD's
performance can degrade significantly after a few years." |
|SSD endurance - the
|Usable versus Raw - in SSD
capacity - isn't the only flash in most SSDs - a significant proportion of
flash can be Invisible. Ever wondered what it's doing? And is it a good or
|SSD capacity -
the iceberg syndrome|
memory channel SSDs
non volatile memory as a tier
- more related reading
|"This really changes
everything. The convergence of Diablo's groundbreaking MCS technology and our
award-winning Guardian Technology is not just about re-architecting storage,
but re-architecting the integration of servers, storage and Flash acceleration.|
and SMART partnership joint press release - (April 24, 2013)|
|"SSDs, have an
identity crisis. They are clearly not drives in the conventional sense of slow,
spinning hard disk drives. Yet SSDs look like drives to system designers because
they retain legacy disk interfaces and rely on disk protection schemes designed
in the 1980s specifically for high-capacity, slow I/O mechanical disks."|
SSD: The Fusion Software Defined Flash Memory Approach - is a paper by Fusion-io. It was
probably written a long time ago - but I only saw it recently.|
innovation in the host-attached flash storage marketplace today comes from
products that not only access flash through a PCIe connection, but also bypass
storage protocols to drive new levels of performance and enable new
functionality not previously imagined. To achieve this, existing technologies
must be left behind..."|
and FlashMAX with Virident's vFAS (July 2012) - blog by Jeff Sosa Director of
|"In the past decade
we've seen that the only technology which could realistically threaten to
displace an SSD from its established market role was yet another SSD."|
|the Modern Era of SSDs
|"The risk of data
corruption from power cycling isn't a random, unforseeable event. It's a direct
result of choices made (or not made) when that SSD was designed... "|
sudden power loss|
|"Little words can have
with big meanings in the world of SSDs. They affect price, performance,
reliability and user happiness."|
|flash SSD jargon explained|
|7 hot SSD topics still
sizzling after all these years|
|Editor:- What were the most popular SSD topics
that StorageSearch.com's readers have been reading in April? |
If I compare this to previous years - many of the headline words sound the
same. But the underlying concepts and change torrents have changed a lot in
their fundamental detail.
|| the Top SSD Companies list
- 24th quarterly edition.|
|| the never ending struggle of how SSD designers
resolve the conflicting pressures related to flash SSD wear-out
and endurance remains ever popular. |
There's a growing toolbag
of techniques which are being used together to extract every last bit of value
and reliability out of the raw semiconductor material - which one of the
world's leading SSD architects - Rado Danilak
(who serially founded SandForce
and then Skyera)
lovingly calls "cheap crappy flash."
|| PCIe SSDs - market
news and vendor list. |
Everyone now knows that the enterprise PCIe SSD
market is a hot strategic business. Our PCIe SSD page was where this market came
But did you know that in the past year a lot of new
technologies have been converging around the PCIe SSD technology space which
have endowed upon it - SAN-like
This means that hot swappable PCIe SSD cards and
drive modules can talk to each other and to other servers at low latencies and
even route around faults.
The PCIe storage market is reinventing
itelf and is ready to take on a bigger role in data architecture thinking. And
being big - it's under attack too - from at least 3 different directions - from
memorybuslike flash SSD competitors which are envious about the PCIe SSD
business and think they can do things better.
||history of the
SSD market includes many useful market transitions - such as the 1st
terabyte SSD, the first SATA SSD etc. |
SSD pioneers had a tough time
in the early decades - because they were competing head to head with other
technologies which were also improving too. That all changed in 2000 - although
it wasn't till a few years later that the market had the confidence that
thereonafter the only technology which could rattle an SSD's cage would be
another newer SSD.
|| the fastest SSDs
have always a popular theme - even though not everyone needs to buy the fastest
Raw SSD speed is the virtue which attracts and opens the doors
to new software techniques which change markets.
A lot of the
computer design techniques which are evolving around the fastest SSDs - will
trickle down to all systems - and they already touch our every day user
experience of the internet and big web sites.
|| Nowadays when I get questions about hard drives versus SSDs
- the tone of the inquiry is - how long has the hard drive market got
||The first of many civil wars within the SSD market - was caused by the
flash in the enterprise in 2004. |
Before then - flash had
stayed mostly in rugged
RAM SSDs were regarded
as the only safe type of SSD for enterprise storage. But as
liberated themselves from the shackles of hard drive emulation bound thinking -
it became clear than at attractive market for flash would be to replace
enterprise RAM SSDs.
The popular and ever changing Flash wars in the
enterprise article has been reporting on these changes since the first
opening salvo from SLC and
SSDs. And it goes on today too - because enterprise flash never signed a