My colleague Henry Baltazar and I have been watching the development of new systems and storage technology for years now, and each of us has been trumpeting in our own way the future potential of new non-volatile memory technology (NVM) to not only provide a major leap for current flash-based storage technology but to trigger a major transformation in how servers and storage are architected and deployed and eventually in how software looks at persistent versus nonpersistent storage.
All well and good, but up until very recently we were limited to vague prognostications about which flavor of NVM would finally belly up to the bar for mass production, and how the resultant systems could be architected. In the last 30 days, two major technology developments, Intel’s further disclosure of its future joint-venture NVM technology, now known as 3D XPoint™ Technology, and Diablo Technologies introduction of Memory1, have allowed us to sharpen the focus on the potential outcomes and routes to market for this next wave of infrastructure transformation.
This week, IBM announced its new line of x86 servers, and included among the usual incremental product improvements is a performance game-changer called eXFlash. eXFlash is the first commercially available implantation of the MCS architecture announced last year by Diablo Technologies. The MCS architecture, and IBM’s eXFlash offering in particular, allows flash memory to be embedded on the system as close to the CPU as main memory, with latencies substantially lower than any other available flash options, offering better performance at a lower solution cost than other embedded flash solutions. Key aspects of the announcement include:
■ Flash DIMMs offer scalable high performance. Write latency (a critical metric) for IBM eXFlash will be in the 5 to 10 microsecond range, whereas best-of-breed competing mezzanine card and PCIe flash can only offer 15 to 20 microseconds (and external flash storage is slower still). Additionally, since the DIMMs are directly attached to the memory controller, flash I/O does not compete with other I/O on the system I/O hub and PCIe subsystem, improving overall system performance for heavily-loaded systems. Additional benefits include linear performance scalability as the number of DIMMs increase and optional built-in hardware mirroring of DIMM pairs.
■ eXFlash DIMMs are compatible with current software. Part of the magic of MCS flash is that it appears to the OS as a standard block-mode device, so all existing block-mode software will work, including applications, caching and tiering or general storage management software. For IBM users, compatibility with IBM’s storage management and FlashCache Storage Accelerator solutions is guaranteed. Other vendors will face zero to low effort in qualifying their solutions.