the fastest SSDs|
Can you trust SSD specs?
how fast can your SSD
- making the same SSD - with less flash
factors which influence
and limit flash SSD performance
Inanimate Power, Speed
and Strength Metaphors in SSD brands
will SSDs end
bottlenecks? - and cure all my server speed woes?
|And the best buy SSDs
shall be the worst (if you change your workloads)|
2, 2014 - An applications optimized SSD system can be the cheapest buy - if
you always use it for the original purpose - but it can be a poor choice
if you throw the wrong type of applications at it. Enter - the good ole general
purpose fast SSD array.
The conflicts are examined in a new blog -
Flash Storage Systems multi-task! written by Woody Hutsell,
IBM who among
other things says - "It just so happens that flash appliances with
built-in deduplication are the worst choices for database acceleration."
The idea that an SSD which is best for one type
of use may have the worst characteristics for another - was also examined from
an architectural point of view in my classic article -
how fast can your
SSD run backwards?
real-world performance of flash storage systems
July 23, 2014 - Editor:- July 23, 2014 - How does flash storage perform in the
real world? - Demartek
aims to provide some answers by reporting on the performance tests
which it has carried out on SSD and hybrid systems from many of the leading
enterprise SSD companies in a session next month at the Flash Memory Summit (August
Demartek says attendees will come away with reasonable estimates
of what they can expect in practice and the results also reveal additional
advantages of flash-based storage, with what Dennis Martin, President
- Demartek calls "happy side effects". ...more info
say hello to CacheIO
Editor:- June 10, 2014 - CacheIO today
announced results of a
benchmark which is
described by their collaborator Orange
Silicon Valley (a telco) as - "One of the top tpm benchmark results
accelerating low cost iSCSI SATA storage."
CacheIO says that the 2
million tpm benchmark on CacheIO accelerated commodity servers and storage
shows that users can deploy its flash cache to accelerate their database
performance without replacing or disrupting their existing servers and storage.
Editor's comments:- The only reason I mention this otherwise
me-too sounding benchmark is because although I've known about CacheIO and
what they've been doing with various organizations in the broadcast and telco
markets for over a year - I didn't list them on StorageSearch.com before.
was partly because they didn't want me to name the customers they were working
with at that time - but also because with
SSD caching companies
becoming almost as numerous as tv stations on a satellite dish - I wanted to
wait and see if they would be worth a repeat viewing. (And now I think they
what's in a number?
Editor:- March 4, 2014 -
is a latency based configuration metric - proposed as a new standard by StorageSearch.com - which can
tersely classify any enterprise server - as seen from an SSD software
perspective - by a single lean number rating from 0 to 7. ...read the article
ESG reports on clustering Virident's PCIe SSDs
January 23, 2014 - ESG
today published a
report for Virident
/ HGST's FlashMAX
II (PCIe SSDs)
which validated the ability of this product family and its
(vShare ) to be configured for useful operation in an Oracle RAC environment
availability configurations which were clustered via
ESG said performance was good they also commented on some current
limitations of the product suite for this type of application. In particular:-
- the lack of a graphical interface for setup and performance mintoring,, and
- the lack of support for other supported fabrics such as 10GbE (mentioned
in the report as a future option), and PCIe fabric (which was not mentioned at
all in this report).
how to avoid hot pluggable PCIe SSD failures
December 3, 2013 - What happens if you test
PCIe SSDs for their
sensitivity to data
corruption or even failure
- in the event of
You'd think that with more hot pluggable products coming
into the market -especially in the
2.5" form factor
- that the experimental outcomes would be known by the designers and problems
debugged so that users wouldn't have to worry.
In August 2013 Quarch Technology
launched some special
test equipemnt to inject power related faults into PCIe SSDs - and the
company today announced
it has extended this range to automate power line error testing of PCIe SFF
Technical Director at Quarch Technology told me today that "Almost every
combination of test kit we have tried in Quarch (a number of friendly customers
lent us kit and eval drives to get the new module up and running) has failed in
some way. Sometimes failing to come back up again nicely, sometimes with a full
BSOD which will almost
certainly have risked data loss."
memory channel SSD vs PCIe SSD write latency - 3rd party
Editor:- November 7, 2013 - If you've been wondering
storage compares with PCIe
here to a new whitepaper (pdf) which includes some useful data. The
application isn't important but it's the first public glimpse which goes
usefully beyond the graphs shown in the product launch documents.
highlight for me is - a mean write latency of about 30µS for MCS compared
to about 100µS for PCIe SSD- at a particular R/W ratio which may of
course look nothing like your own setups.
Nimbus scores $40 per virtual desktop in IOmark-VDI
October 1, 2013 - I was talking recently to Tom Isakovich,
CEO and founder of Nimbus
Data Systems about the state of the market and a possible date for an
IPO (which you can read more about in
that we moved onto the subject of
customers buy SSD arrays - and we traded stories about some of the
explanations which get tossed around like
IOPS per dollar -
which when you scrutinize them in any detail are ridiculous. We've both seen
leading edge silicon SSD companies put nonsensical graphs into their marketing
presentations which don't lead you anywhere useful in the real world if you
follow the superficial analysis. (That's because these vendors don't make
systems - and are many steps removed from genuine enterprise thinking.)
said most of his customers couldn't tell you how many
apps were demanding.
I said I've been writing about the "cost
of satisfying a given number of virtual users for a particular type of app"
as being a useful comparison figure (for storage). We both agreed that even if
enterprises don't know for sure what their throughputs or IOPS are - they have a
good idea of how many users they're trying to serve within their organization or
at customer facing web interfaces. The payroll tells you one, the marketing
people can tell you the other. And accounting can tell you how much it all
costs. You don't need storage
analyzer tools to get a feeling for where the ground level lies.
our conversation had already veered towards the subject of a simple way that
users can compare the costs of SSD storage for particular types of apps - and
as I'd asked the question - he said there was a benchmark called IOmark-VDI
which Nimbus had participated in recently with the
He said he went into the process because he thought it might be a good thing to
try out - and was gratified to found out that it shows the Nimbus product in a
very good light with a
under $40 per virtual desktop (pdf) achieved by a 2U Nimbus system
supporting up to 4,032 linked clone VDI images.
measuring enterprise SSD performance - intro by Micron
August 23, 2013 - EDN today
published a introductory article on the subject of
enterprise SSD performance - written by Doug Rollins, Senior
Applications Engineer at Micron
- which could be useful for newcomers to this topic as it expounds some of the
basic assumptions and jargon. ...read
Can you trust flash SSD
specs & benchmarks?
FIO's ION software enables Breakthrough Shared Storage
Editor:- June 13, 2013 - The performance of
Accelerator software - which you can add to its PCIe SSD cards, any
standard server and some FC adapters to roll your own SAN
rackmount SSD -
is the point of a new
blog by the company
today which celebrates recent benchmarks for
2, 4 and 8
processor HP server configuartions (pdf).
Stec's profiler removes guesswork in sizing SSD caches for
Editor:- May 21, 2013 - Stec today
that it's offering a free profiling tool -
Profiler - which can enable users to determine how much benefit they would
get from using its
(SSD caching software) - before they even install any SSDs.
company says that the "non-disruptive installation" can save hours of
administrative trial and error by recommending the optimal block size, and the
capacity and type of SSDs to be used for maximum performance gain.
SSD performance characteristics and limitations
March 15, 2013 - published today - the new home page blog on StorageSearch.com is -
a toolkit for
understanding flash SSD performance characteristics and limitations.
brings together in one place many of the tools I use every day when thinking
about and assessing SSDs.
in memory database even better with FIO's flash
November 20, 2012 - McObject
recently released new
benchmark results which indicate that the in-memory database company is not
so unfriendly to flash SSDs as you may have thought from reading earlier
company positioning papers.
It seems that a software product - which
was originally designed for the DRAM-HDD world - is a good fit in the flash SSD
world too - if you have the right scale of data and the right SSD. ...read more
new article - adaptive flash care IP (including DSP)
June 19, 2012 - A few months ago I promised readers that I would publish a
tentative list of SSD companies who use what I loosely called
DSP technologies in SSD IP" in their new designs. .
of the most important design techniques being used in some leading flash SSDs
- in which the SSD designer can adapt the reliability, speed and power
consumption of the SSD - not based on some faw away population model of flash
chips - but optimized for the chips in each SSD - and adapting the
controller behavior to
what is measured and learned from interacting with the flash chips installed.
This is a market changing technique.
suite could speed up auto-tiering SSD evaluations |
|Editor:- November 29, 2011 -
availability of its Disk I/O Ranger software analysis tool for Windows
The company says this will help users diagnose and
understand disk storage access performance problems and to to verify that QoS
levels are being met at the application/file/device level. It could also
simplify the evaluation of
appliances by collecting real-time metrics.
I asked Tom West, President of hyperI/O what he was seeing of the SSD
market from his perspective of selling storage analysis tools. He said -"One
of the major users of the hIOmon software is listed within the top 10 of your
latest - Top 20 SSD
Microsemi reports shake rattle and roll SSD results
May 19, 2011 - Microsemi
today announced that its TRRUST-STOR
(2.5" rugged SSDs) are the industry's first SSDs to pass zero-failure
testing at vibration
levels that are consistent with the industry's most severe environments.
"No other SSD manufacturers have published zero-failure results
at this level of vibration testing, which was conducted while our drives were
fully operational, reading and writing data," said Jack Bogdanski, director
of marketing for Microsemi. "The ability for SSDs to perform flawlessly
under adverse environmental conditions is becoming increasingly important for
applications where it is critical that data be protected at all times."
Microsemi's SSD units were pre-conditioned at 85°C for 336
How and why to monitor VM Performance
February 23, 2011 - How
to Proactively Monitor VM Performance is a new article on
Data Center POST written
by Alex Rosemblat,
Product Marketing Manager at VKernel
- who says "Proactive monitoring of a virtualized data center can assist
in finding potential performance problems before they occur..."
comments:- OK he says a lot more than that - and that's why I mentioned his
I used to do a lot of performance analysis in my
pre cut and paste
career because I designed systems with guaranteed apps response times. And
in my current job I always check my stats before I look at my email. So I have
a lot of empathy for the storage
test and analysis market. The more you understand about the internals of
complex systems the less likely you are to get mugged by them. ...
read the article
SandForce publishes list of approved test tool partners
January 31, 2011 -SandForce
has started a directory of companies, tools, technologies and services to
help SSD designers integrate its
SSD processors and get
them to market more quickly.
Each member company in the new
Trusted program ensures that their products and/or services fully
support SandForce SSD Processors and provides response to SandForce customer
inquiries within 24 hours while committing to high-priority support for fastest
Editor's comments:- 6 out of the 7 initial
companies in the new program provide
test / design verification
||Megabyte liked to keep his systems
in peak condition.|
|"The more you study
the characteristics of different SSDs - the quicker and more easily you will
start to anticipate useful behavioral characteristics of any new SSD - and
assimilate it in your plans. And you'll start to recognize symptoms of "missing
technical information" too."|
|flash SSD performance
characteristics and limitations |
| "Our past work
showed that application-unaware design of memory controllers, and in particular
memory scheduling algorithms, leads to uncontrolled interference of applications
in the memory system. |
"Such uncontrolled interference can lead to
denial of service to some applications, low system performance, and an inability
to satisfy performance requirements, which makes the system uncontrollable and
unpredictable" - said Onur Mutlu, Assistant Professor Electrical and
Computer Engineering - Carnegie Mellon University.
|Are you ready to
|"If repeat writes to
the same small address range (same flash blocks) is interspersed with read
operations (what I call - the play it again Sam scenario - which occurs in
database tables) the performance outcome varies significantly between different
designs of flash SSDs." |
|the Problem with
Write IOPS in flash SSDs|
management in flash SSDs|
|This is an introduction to the thinking behind
one of the many vital functions inside a flash
media defect quality in new flash memory chips has grown steadily worse in the
past 10 years as geometries have shrunk.
||This article enumerates
the scale of the problem and explains how intrinsically dodgy flash memory
is transformed into dependable flash SSDs which you can entrust with your data.