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2.5" PCIe SSDs

by Zsolt Kerekes, editor, - May 21, 2012

A new family is planning to move into the enterprise end of SSD street - removable 2.5" SSDs which have a PCIe interface.

The market for 2.5" SSDs which have a PCIe interface marks the soon to be crowded intersection point of 3 different SSD market strands.
  • the next step in the SATA-IO (ORG) performance roadmap for SATA 3 SSDs in the form of SATA express (with 2 lanes of gen2 PCIe) instead of a 12Gbps scaling of Serial ATA - which option was rejected in 2011 as not offering a competitively viable standard.
  • a virgin market opportunity for vendors who already have IP assets in the crowded enterprise PCIe SSD market and who want to stretch those assets into new application areas for removable PCIe SSDs.

    One way to think about the scale of the market opportunity is this.

    SSD ad - click for more infoSuppose you're in the controller business and already have a PCIe SSD IP which sells well in enterprise server slots.

    In classical SAN architecture - for every SSD you sell which plugs into a server slot - there's a lot more drive slots out there in the storage racks.

    OK the reality is that - in competition with the SAN view of the enterprise - we now also have the scalable storage as software - or cloud types of architecture too.

    But whatever may happen in the end - the thing which will undoubtedly happen next - is that the number of potential SSD slots in SAN storage racks is a bigger number (10x) and will grow faster than the SSD slots in new servers.
  • an alternative upwards (or sideways migration route) for systems designers who need a next step after 12Gbps SAS SSDs.
The only complicating factors which are going to slow down the race to get products into the 2.5" PCIe SSD market are detailed marketing decisions about whether to ship vanilla SSDs or use the new form factor as a way to leverage new features which users will specifically value or expect too see in this particular module form factor - due to the cultural heritage and experience with earlier types of 2.5" SSDs. They relate to:-
  • SSD software:- the specific type of virtuualization. The 2.5" paradigm supports hot swap and upgrades. Ideally the software should support almost instant benefits if users decide to plug in new 2.5" SSDs.
  • standards: - what language will the 2.5" PCIe SSDs speak? PCIe is a neutral physical connection. The emerging SCSI Express standard is just one of many possibilities. Others include standard storage networks such as SAN, iSCSI etc.
  • fault tolerance:- what type of architecture will underpin the 2.5" PCIe SSD rack? Possibilities range from standard RAID like systems upto proprietary schemes which can provide much better resilience at greater efficiency.
  • pricing strategy:- the new form factor will open up new application slots - some of which will be positioned above those of existing 2.5" SAS SSDs. But less obviously by negating the essential need for on-board controllers some of the new SSDs could be positioned in the cost gap between high end enterprise SATA SSDs and fast-enough SAS SSDs too (see more below).

How will the 2.5" PCIe SSD market affect the business of current PCIe SSD companies?

I've spoken to a representative sample of enterprise SSD companies about the new form factor. This includes companies which currently make PCIe SSDs and also some who don't.

The general view is that 2.5" PCIe SSDs represent additional new business - compared to installing PCIe SSD cards and multi-card modules into server slots.

How will 2.5" PCIe SSDs impact the business of SAS SSD makers?

In the long term I think it will reduce the market size for SAS SSDs because the new types of SSDs will provide faster throughput and lower latency - and the possibility of offering fast-enough SSDs at lower cost too.

However SAS SSDs work here and now - and it could take another year or so for 2.5" PCIe SSDs to get firmly established in the market.

My guess is that initially some vendors of 2.5" PCIe SSDs will position their products as options which sit above the performance capabilities of their SAS SSD product lines.

But other options are possible too. For example a 2.5" PCIe SSD - which offloads its flash controller functions to the host server (like Fusion-io's products) could deliver lower power consumption and higher capacity than traditional SAS SSDs - and at lower cost. In the non-offfloaded flash management design (which other vendors may also introduce too) - the new 2.5" PCIe SSDs could be designed at a lower cost than SAS SSDs (because they don't need the controller).

That's one of the reasons that SAS SSD makers are looking at this market too.

Why do we need yet another type of SSD component in the enterprise?

The simple answer is that some users prefer the unit of upgrade or fault replacement to be a drive instead of a whole rack.

And although it's possible to upgrade or replace PCIe SSDs at the card level - it's more convenient to do so at the module level.

The new 2.5" PCIe SSDs will affect the variety of options seen inside fast SSD racks. They have been a long time coming and are already included in my earlier published models about SSD market silos.

As I said above - there will soon be more than 20 companies in this market - and the new products will be the showcases for new configuation possibilities.

Companies which have already publicly announced such products and demonstrated prototypes, or are shipping them include:- OCZ, Micron, Fusion-io and Samsung.

...Later updates:- September 2012

The subject of 2.5" PCIe SSDs and related standards such as NVMe came up in several papers and blogs centered on the Flash Memory Summit (August 2012).

Here are some links and notes.
  • "2 competing enterprise initiatives have emerged in the attempt to align the industry around PCIe based SSDs - SCSI express (led by HP) and NVMe (led by Intel and Dell). While a 3rd standard - SATA express - is aimed at clients and hybrids. In the 2.5" drive size - a multi-function bay can support both SAS and PCIe SSDs with the same SFF-8639 connector" - HGST paper - enterprise interface trends (pdf)
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who's making waves in enterprise 2.5" PCIe SSDs?
The list of leading SSD companies below is from the news archives on

"My guess is that 1 in 4 fast enterprise 2.5" SSDs will be PCIe rather than SAS in 3 years time for the reasons given in my article - future SSD capacity ratios in the server, SAN and archive?"

Zsolt Kerekes, editor - in an email to a reader re SAS SSD market cannibalization - (September 14, 2012)
Memblaze enters 2.5" PCIe SSD market
Editor:- March 16, 2015 - Memblaze today announced it is showing a 2.5" NVMe PCIe SSD variant of its PBlaze series at CeBIT in Germany.

Memblaze was the 27th most highly searched SSD company by readers of in Q4 2014.
HGST samples 3TB 2.5" PCIe SSD
news image - 2.5 inch NVMe SSD - click for infoEditor:- March 11, 2015 - HGST is sampling a new range of SSDs for the 2.5" PCIe SSD market.

The 2.5" NVMe Ultrastar SN100 (pdf) has upto 3.2TB capacity. No DWPD data was available when I looked.
8TB 2.5" PCIe SSDs sampling soon from Novachips
Editor:- March 4, 2015 - Are you interested in a world's first 2.5" 8TB (15mm height) PCIe Gen2 x4 SSD (pdf) with a single controller developed by Novachips. in Korea?

Novachip 8TB 2.5 inch PCIe SSDThat was an email I got recently from Sean Oh, based in Kronberg, Germany, ( who is the sales representative for these products in Europe.

What would you say? I did the same. After reading up the info he attached (there's a SATA version too) I asked some questions about availability. Here's what Sean said.
  • The working engineering samples have been available since last year.
  • The 1st customer sample comes out in the next 30 days.
  • We plan to start a mass production in 2nd half of this year.
Editor's comments:- part of this story has its roots in a news story from May 2007 - when a company called MOSAID was talking about a new, light capacitive load, ring based, flash memory topology called HLNAND. To make it work they needed a controller. Novachips collaborated on the design and recently acquired the assets and patents.
OCZ samples hot swap, fast 2.5" NVMe SSDs
Editor:- September 9, 2014 - OCZ announced that this month it will begin sampling a new 2.5" hot swappable enterprise PCIe SSD - the Z-Drive 6000 - a native PCIe 3.0 NVMe 1.1 solution - which the company says "provides industry-leading IOPS per dollar".

It has a SFF-8639 connector, internal RAID, power loss data protection, "consistent low latency", and encryption.

Editor's comments:- Although OCZ demonstrated the SSD industry's first working 3.5" PCIe SSD prototype 4 years ago - in August 2010 - the company didn't follow through to establish an early lead in its natural successor - the 2.5" enterprise PCIe market.

The main reason for that being financial problems in OCZ in the years which immediately followed - which mitigated against products which didn't have a short term guaranteed market.

Now, however, with OCZ having been almost a year as a Toshiba group company - the small form factor enterprise NVMe market looks like a natural fit for OCZ - as an extension of its long running conventional form factor PCIe SSD accelerator business.
Intel's new 2.5" PCIe SSDs
Editor:- June 3, 2014 - Intel has announced details of new NVMe compatible 2.5" PCIe SSDs - the P3700 Series - which will offer upto 2TB (20nm) capacity in a 15mm high hot-swap form factor.
Samsung 2.5 inch PCIe SSD image ... Our new 2.5" NVMe PCIe SSD is 3x faster than 12Gbps SAS SSDs - says Samsung

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2.5" PCIe SSDs were the most significant new SSD product type seen in 2012.
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Micron's turning up the heat for adoption of 2.5" PCIe SSDs.
Editor:- May 2, 2013 - Micron announced it's sampling a new model in the hot swappable 2.5" PCIe SSDs market - the P420m has upto 1.4TB MLC capacity and can deliver 750K R IOPS. ...more in SSD news
2.5" PCIe SSD - Dell talks to Micron
Editor:- October 22, 2012 - Removable 2.5" PCIe SSDs are the subject of a new video today from Micron - which features Microns Ed Doller and Dells Brian Payne.
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"I can see no advantages or reasons to start using PCIe SSDs instead of SAS SSDs inside our systems....."
Thomas Isakovich, CEO and founder of Nimbus replying to a question from the editor of about the technology roadmap in their rackmount SSDs - (February 2012)
You're not going to see 12Gbps SATA SSDs anytime soon. Instead the next iteration in speedup for for SATA is SATAe or SATA express - which will be drives which are mechanically identical but which can offer SATA 3 or 2 lane PCIe connections in the same slot.
SATA market milestones
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When you look at the photos and headline specs for high speed PCIe SSDs - it's easy to come away with the impression that they all look the same and have about the same performance.
click to read the article After all - how different can they be? A lot. the article