As Mike Speiser discussed recently, flash solid-state drives (SSD) will enable a once-in-a-decade improvement in storage price-performance. Crucially, flash SSDs enable storage to keep up with the rapid advances in CPU speeds driven by Moore’s Law. This may enable customers to dramatically scale back purchases of expensive Fibre Channel (FC) disks and, potentially, high-end FC arrays. However, some early flash SSDs implementations come with a set of limitations that customers need to be aware of, notably around usability and resilience.
Solid-state disks have been proclaimed the “future of storage” in the past, but we are now approaching an actual inflection point because:
- SSD pricing is declining at more than 50 percent per year, and SSDs have recently become cheaper than their nearest competitior (FC disks) as measured by effectively usable capacity; the gap will continue to widen in favor of SSD, as disk prices decline just 25-30 percent annually.
- The exciting (and cost-effective) use case for SSD is as a cache for frequently accessed data that front-ends lower-cost SAS and potentially SATA disks, rather than as primary storage.
- Weaknesses of using SSDs as flash memory are starting to be addressed through smart firmware that sits in the controller.
Pace of adoption
Overall, TechAlpha believes flash SSD is one of the most disruptive trends in storage, but it will only become material to the market beyond 2010. Customers we interviewed for our GigaOM Pro research note (subscription required) tend to focus more on cost per GB in the current economic climate, and less on cost per Input/Output Operations Per Second (IOPS), which is where flash SSD excels. However, the vendor executives we interviewed agree that flash SSD is the single most disruptive trend for which their companies are preparing, causing them to completely rethink how and where data is stored.
Three developments are likely to converge in 2011 and drive broader adoption:
- Vendors will bring more robust flash SSD solutions to market.
- Customers will look beyond short-term IT cost savings toward business value enabled by technological innovation. One large bank we heard from estimated that every millisecond of storage response time reduction translates to tens of millions of dollars in incremental annual profit, because securities trades are executed faster.
- Flash SSD pricing will be comfortably below that of FC on a cost-per-effective-GB basis.
We believe flash SSD will start to replace a good share of the high-performance (i.e., FC) disk market in the next 2-3 years. Already, flash SSDs are starting to take off in the high IOPS use cases, delivering much reduced power consumption and radically better read performance. The speed of broader adoption, though, will largely depend on how well vendors address some limitations (which we describe in more detail in our GigaOM Pro note). The early adopter workloads will likely be search, video rendering, email and potentially other mission-critical applications.
Juergen Urbanski is managing director of TechAlpha, an industry analyst and management consulting firm serving enterprise IT executives on aligning IT infrastructure and applications with business needs, and a contributor to the GigaOM Analyst Network.
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Photo courtesy Roberto F.