There are several key takeaways to this news, one being that Fusion-io has long berated SSDs for poor performance. This would lead many to question why they are looking to enter the 2.5 inch SSD market. The answer lies partly in the interface that they are utilizing for this new device, the SCSI Express protocol. Adaptec SCSI RAID 2200S Low-profile dual-channel Adaptec SCSI RAID 2200S is a 64-bit/66MHz Ultra320 RAID controller designed for mid-range and high-density servers. Advanced features include Adaptec's optimized disk utilization, Online Capacity Expansion, RAID Level Migration and full OS support. PVSCSI, however, sees a 15% improvement in IOPS between 32 OIOs and 64, based on a single Fusion-io ioDrive2 card as the underlying storage. A storage array of multiple backend devices will potentially show a much greater improvement when queue depth is increased. Fusion-io has announced that it has acquired the UK-based storage technology company ID7, the leading developer of the open source SCSI Target Subsystem for Linux. Fusion-io specialises in acceleration technology including high performance and capacity PCIe SSD cards and is also known for employing Steve Wozniak as Chief Scientist. Hello All, I am having issues with firmware updates on my Fusion-IO Duo PCIe SSD (HP 320GB SLC/HP Part Numbers 600281-B21 & 600477-001). Here is what I have done: 1. I am running under MS Windows 10 Pro (not Windows Server 2012;), HP io accelerator Ver 3.2.8, HP iosphere Ver 3.9.0, on a.
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By Pedro Hernandez
Fusion-io revealed today that it made another investment in software defined storage. The company announced that it acquired ID7, the UK-based company behind the open source SCST SCSI Linux target subsystem. Financial terms were not disclosed.
The companies did, however, give an indication of how the deal will impact Fusion-io's goal of mainstreaming flash storage in the data center. It's a strategy that, as of late, hinges on software as much as it does on the company's ioDrive, ioScale and ioFX flash acceleration hardware.
Last summer, Fusion-io released ION, software that in conjunction with the company's PCIe flash add-on cards turns 'tier one servers into a shared data acceleration appliance,' according to the company. The software defined storage acceleration technology can provide improvements of up to 40x in application performance, 25x for SQL Server and 8x in media transcoding.
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During its unveiling, Fusion-io's influential chief scientist and Apple cofounder Steve Wozniak gave the company's pursuit of software-enhanced storage his personal stamp of approval. 'Powerful software can be the foundation for incredible innovation, especially when it's also an open system that shares resources,' he said.
As it turns out, ION helped paved the way for today's deal, said ID7 CTO and founder Mark Klarzynski.
'We had an opportunity to work with Fusion-io on the development of the ION Data Accelerator when it became apparent that the team has been founded on a culture of architecting software innovation deep within the Linux operating system kernel to deliver significant breakthroughs in modern storage architectures,' he said in press remarks.
Fusion-io followed up in late August by releasing an update for its ioTurbine software, which the company acquired when it bought up IO Turbine for $95 million in 2011. Targeted at virtualized environments, ioTurbine is a cross-platform virtual machine (VM) acceleration solution that rebalances flash storage resources in accordance to VM movement to speed up performance and lower costs by increasing the number of VMs that a server can handle.
With ID7 on board, Fusion-io CEO David Flynn is signaling that he is poised to expand on the capabilities of the company's growing software portfolio.
'Software defined storage platforms are key to delivering peak performance and efficiency in today's datacenters. ID7 has provided valuable contributions to the industry, making us excited to welcome them to our ION Data Accelerator team as we continue to grow our business with the expertise of many of the world's most innovative engineers,' he said in a statement.
And SCST is in no danger of taking a back seat to the company's commercial products once the ID7 team is integrated into Fusion-io, indicated Fusion-io senior vice president of products Gary Orenstein.
SCST serves as a SCSI target subsystem for the Linux operating system and is compatible with iSCSI, Fibre Channel, FCoE, SAS, InfiniBand and Wide SCSI. It enables any Linux server or appliance to provide advanced storage management capabilities like replication, thin provisioning, deduplication, high availability and automatic backups.
'In addition to maintaining an open source version of SCST, Fusion-io will continue to contribute to the open source distribution as we develop software solutions to help define the all-flash datacenter,' informed Orenstein.
Pedro Hernandez is a contributing editor at InternetNews.com, the news service of the IT Business Edge Network, the network for technology professionals. Follow him on Twitter @ecoINSITE.
This article was originally published on March 18, 2013
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This is the complete repost of Chris Mellior’s terrific article from last week:
Gotta be PCIe and not SAS or SATA
By Chris Mellor • Get more from this author
Posted in Storage, 7th December 2011 15:43 GMT
A flash device that can put out 100,000 IOPS shouldn’t be crippled by a disk interface geared to dealing with the 200 or so IOPS delivered by individual slow hard disk drives.
Disk drives suffer from the wait before the read head is positioned over the target track; 11msecs for a random read and 13msecs for a random write on Seagate’s 750GB Momentus. Solid state drives (SSDS) do not suffer from the lag, and PCIe flash cards from vendors such as Fusion-io have showed how fast NAND storage can be when directly connected to servers, meaning 350,000 and more IOPS from its ioDrive 2 products.
Generation 3 PCIe delivers 1GB/sec per lane, with a 4-lane (x4) gen 3 PCIe interface shipping 4GB/sec.
You cannot hook an SSD directly to such a PCIe bus with any standard interface.
You can hook up virtually any disk drive to an external USB interface or an internal SAS otr ATA one and the host computer’s O/S will have standard drivers that can deal with it. Ditto for an SSD using these interfaces, but the SSD is sluggardly. To operate at full speed and so deliver data fast and help keep a multi-core CPU busy, it needs an interface to a server’s PCIe bus that is direct and not mediated through a disk drive gateway.
What could go wrong with this rosy outlook? Plenty; this is IT. There is, of course, a competing standards initiative called SCSI Express.
If you could hook an SSD directly to the PCIe bus you could dispense with an intervening HBA that requires power, and slows down the SSD through a few microseconds added latency and a hard disk drive-connectivity based design.
There are two efforts to produce standards for this interface: the NVMe and the SCSI Express initiatives.
NVMe
NVMe, standing for Non-Volatile Memory express, is a standard-based initiative by some 80 companies to develop a common interface. An NVMHCI (Non-Volatile Memory Host Controller Interface) work group is directed by a multi-member Promoter Group of companies – formed in June 2011 – which includes Cisco, Dell, EMC, IDT, Intel, NetApp, and Oracle. Permanent seats in this group are held by these seven vendors, with six other seats held by elected representatives from amongst the other work group member companies.
It appears that HP is not an NVMe member, and most if not all NVMe supporters are not SCSI Express supporters.
The work group released a v1.0 specification in March this years, and details can be obtained at the NVM Express website.
A white paper on that site says:
The standard includes the register programming interface, command set, and feature set definition. This enables standard drivers to be written for each OS and enables interoperability between implementations that shortens OEM qualification cycles. …The interface provides an optimised command issue and completion path. It includes support for parallel operation by supporting up to 64K command queues within an I/O Queue. Additionally, support has been added for many Enterprise capabilities like end-to-end data protection (compatible with T10 DIF and DIX standards), enhanced error reporting, and virtualisation.
The standard has recommendations for client and enterprise systems, which is useful as it means it will embrace the spectrum from notebook to enterprise server. The specification can support up to 64,000 I/O queues with up to 64,000 commands per queue. It’s multi-core CPU in scope and each processor core can implement its own queue. There will also be a means of supporting legacy interfaces, meaning SAS and SATA, somehow.
A blog on the NVMe website discusses how the ideal is to have a SSD with a flash controller chip, a system-on-chip (SoC) that includes the NVMe functionality.
What looks likely to happen is that, with comparatively broad support across the industry, SoC suppliers will deliver NVMe SoCS, O/S suppliers will deliver drivers for NVMe-compliant SSDs devices, and then server, desktop and notebook suppliers will deliver systems with NVMe-connected flash storage, possibly in 2013.
What could go wrong with this rosy outlook?
Plenty; this is IT. There is, of course, a competing standards initiative called SCSI Express.
SCSI Express
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SCSI Express uses the SCSI protocol to have SCSI targets and initiators talk to each other across a PCIe connection; very roughly it’s NVMe with added SCSI. HP is a visible supporter of it, with there being SCSI Express booth at its HP Discover event in Vienna, and support at the event from Fusion-io.
Fusion said its “preview demonstration showcases ioMemory connected with a 2U HP ProLiant DL380 G7 server via SCSI Express … [It] uses the same ioMemory and VSL technology as the recently announced Fusion ioDrive2 products, demonstrating the possibility of extending Fusion’s Virtual Storage Layer (VSL) software capabilities to a new form factor to enable accelerated application performance and enterprise-class reliability.”
The SCSI Express standard “includes a SCSI Command set optimised for solid-state technologies … [and] delivers enterprise attributes and reliability with a Universal Drive Connector that offers utmost flexibility and device interoperability, including SAS, SATA and SCSI Express. The Universal Drive Connector also preserves legacy investments and enables support for emerging storage memory devices.”
An SNIA document states:
Currently ongoing in the T10 (www.t10.org) committee is the development of SCSI over PCIe (SOP), an effort to standardise the SCSI protocol across a PCIe physical interface. SOP will support two queuing interfaces – NVMe and PQI (PCIe Queuing Interface).
PQI is said to be fast and lightweight. There are proprietary SCSI-over-PCIe products available from PMC, LSI, Marvell and HP but SCSI Express is said to be, like PQI, open.
The support of the NVMe queuing interface suggests that SCSI EXpress and NVMe might be able to come together, which would be a good thing and prevent the industry working on separate SSD PCIe-interfacing SoCs and operating system drivers.
Of course this imagining could be just us blowing smoke up our own ass.
There is no SCSI Express website but HP Discover in Vienna last month revealed a fair amount about SCSI express, which is described in a Nigel Poulton blog.
He says that a 2.5-inch SSD will slot into a 2.5-inch bay on the front of a server, for example, and that “[t]he [solid state] drive will mate with a specially designed, but industry standard, interface that will talk a specially designed, but again industry standard, protocol (the protocol enhances the SCSI command set for SSD) with standard drivers that will ship with future versions of major Operating Systems like Windows, Linux and ESXi”.
Fusion-io 2.5-inch, SCSI Express-supporting SSDs plugged into the top two ports in the card pictured above. Poulton says these ports are SFF 8639 ones. The other six ports appear to be SAS ports.
A podcast on HP social media guy Calvin Zito’s blog has two HP staffers at Vienna talking about SCSI Express.
SCSI Express productisation
SCSI Express productisation, according to HP, should occur around the end of 2012. We are encouraged (listen to podcast above) to think of HP servers with flash DAS formed from SCSI Express-connected SSDs, but also storage arrays, such as HP’s P4000, being built from ProLiant servers with SCSI Express-connected SSDs inside them.
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This seems odd as the P4000 is an iSCSI shared SAN array, and why would you want to get data at PCIe speeds from the SSDs inside to its X86 controller/server, and then ship them across a slow iSCSI link to other servers running the apps that need the data?
It only makes sense to me if the P4000 is running the apps needing the data as well, if the P4000 and app-running servers are collapsed or converged into a single (servers + P4000) system. Imagine HP’s P10000 (3PAR) and X9000 (Ibrix) arrays doing the same thing: its Converged Infrastructure ideas seem quite exciting in terms of getting apps to run faster. Of course this imagining could be just us blowing smoke up our own ass.
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El Reg’s takeaway from all this is that NVMe is almost a certainty because of the weight and breadth of its backing across the industry. We think it highly likely that HP will productise SCSI Express, with support from Fusion-io and that, unless there is a SCSI Express/NVMe convergence effort, we’re quite likely to face a brief period of interface wars before one or the other becomes dominant.
Concerning SCSI Express and NVMe differences, EMC engineer Amnon Izhar said: “On the physical layer both will be the same. NVMe and [SCSI Express] will be different transport/driver implementations,” implying that convergence could well happen, given sufficient will.
Our gut feeling is that PCIe interface convergence is unlikely, as HP is quite capable of going its own way; witness the FATA disks of recent years and also its individual and admirably obdurate flag-waving over Itanium. ®