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style="font-size: 8pt"> Tam Harbert<br> www.itnews.com (Computerworld)<br> February 08, 2010<br><br>&nbsp;<br> As a new decade opens, more and more data center operators find themselves struggling with an enterprise bottleneck not of their own making. <br><br> Servers' hard disk access times have not kept up with the increasing speed of their CPUs, and the resulting lags can be a limiting factor in some database and caching applications, particularly those involving software as a service and cloud computing. As these applications become even more popular, the bottleneck is likely to get worse, analysts predict. And the database appliances designed to target the problem, which have been on the market for years, remain expensive. <br><br> Enter flash memory. Until recently, the high cost of flash memory limited it to consumer items with relatively low storage capacities, like digital cameras and MP3 players. <br><br> But over the last three years, flash prices have declined an average of 60% a year -- a rate that's "faster than has ever happened in the world of semiconductors," according to In-Stat, a market research firm in Scottsdale, Ariz. <br><br> This confluence of factors is bringing flash, in the form of solid-state drives (SSD), into data centers. <br><br> While it's still early in the adoption curve, analysts predict an increase in the use of SSDs in the enterprise. At its annual data center conference in December 2009, research firm Gartner Inc. called flash-based solid-state storage one of the most important technologies of 2010. <br><br> Gartner isn't alone in singing SSDs' praises. "Anybody that's managing and buying storage should be taking a look at the flash options on the market and determining whether it's a good fit for them," says Andrew Reichman, a storage analyst at Forrester Research Inc. <br><br> Costing out SSDs <br><br> To be sure, despite their declining prices, SSDs remain much more expensive than hard drives on a cost-per-gigabyte basis. Depending on performance, SSDs can range in cost from $3 to $20 per gigabyte, says Jim Handy, a Los Gatos, Calif.-based SSD analyst with Objective Analysis, a semiconductor market research consultancy. <br><br> Hard drives range in price from 10 cents per gigabyte on the low end to $2 to $3 per gigabyte for enterprise-level, 15,000-rpm models. "The ratio between SSD and HDD pricing is about 20:1 for the bottom end of both technologies, and this will stay in effect for the next several years," Handy says. <br><br> Gartner analyst Joe Unsworth puts the average cost of SSDs at about 10 times that of hard disk drives. But cost-per-gigabyte is not the most important factor in some of these access-heavy data center applications. Rather, it's cost per IOPS (input/output operations per second). <br><br> The average enterprise-class, 15,000-rpm hard drive achieves 350 to 400 IOPS, says Scott Stetzer, director of enterprise SSD products at STEC Inc., a Santa Ana, Calif.-based SSD vendor. The average enterprise-class SSD can push 80,000 IOPS. "It's a world of difference in the level of performance." <br><br> Such performance benefits can outweigh the cost differential in certain instances, particularly once you factor in savings from energy costs (SSDs use less energy than hard disks). Applications that require extremely fast location and/or retrieval of data -- like credit-card transactions, video on demand or information-heavy Web searches -- stand to benefit from solid-state technology. Although the total share of the enterprise market that uses enterprise SSDs will remain small, the technology will play an important role in these critical applications, analysts predict. <br><br> SSDs in the data center <br><br> SSDs are making their way into data centers in several ways. First, most server vendors are offering SSDs as options, either as a replacement for a hard drive or in addition to one. Salt Lake City-based Fusion-IO even offers an SSD on a PCI card. Second, most storage vendors are incorporating SSDs into their systems. EMC Corp., for example, buys SSDs from STEC and incorporates them into its Symmetrix and Clariion products. <br><br> And finally, several companies are building general-use data-access appliances that incorporate SSDs. For instance, Sunnyvale, Calif.-based Schooner Information Technology Inc., has developed appliances for the Memcached caching system and for MySQL databases. Rather than targeting specific functions like business analytics or Web caching, as previous data appliances have, Schooner incorporates flash in an appliance that aims to improve performance of the entire data access tier of the data center, explains John Busch, Schooner's chairman and chief technology officer. <br><br> Where SSDs make sense <br><br> SSDs appeared on the radar of data center operators in the last year to 18 months. "It became an increasingly frequent conversation [with customers] about 13 to 14 months ago," says Steve Merkel, director of solutions engineering at Latisys, an Englewood, Colo.-based managed service provider. "We started running a few scenarios where it looked like SSDs would be a reasonable technology to use." <br><br> Today, there are two prime uses. Houston-based The Planet Inc., which runs eight data centers and hosts 18 million Web sites worldwide, sees customers using SSDs on their host servers to speed Web analytics applications, says Rob Walters, director of product management. Latisys sees a similar uptake. One customer, for example, does analytics and profiling of Web site visitors, then offers up targeted ads. "They have very large data sets," says Merkel. "They can't sit around and wait for traditional storage [response times]." <br><br> Others simply need their databases to run faster, so they use SSDs rather than traditional storage arrays. One Latisys client, for example, is using SSDs to increase the speed at which it maps address changes for the U.S. Postal Service. Rather than put entire databases in the system's main memory, which would be extremely expensive, the company stores data on SSDs for quick access. <br><br> Using flash memory in this way is about 10 times more expensive than storing it on hard drives, but about 10 times less expensive than storing an entire database in dynamic RAM, says Forrester's Reichman. <br><br> Forecast: Enterprise SSD shipments <br><br> Units in thousands <br><br> 2007 16.7 <br><br> 2008 59.4 <br><br> 2009 281 <br><br> 2010 845 <br><br> 2011 1,979 <br><br> 2012 3,444 <br><br> 2013 5,337 <br><br> Long term, SSDs may end up changing the architecture of the data center. <br><br> "I don't think we're seeing all the performance gains from SSDs that we could see," says NextStop's Graham. "There are more gains to be made by thinking about how to re-architect some of these systems that have for a long time been optimized to work well with disks." <br><br> That's the focus of some vendors, like Schooner, which emphasizes that it isn't just adding SSDs, it's focusing on revamping the entire data-tier architecture. "The [individual component] technology today is way ahead of what the architectures can utilize," says Busch, adding that re-architecting could produce 10 times greater improvement in performance. <br><br> </font></p> </td> </tr> <!--<tr> <td> &nbsp;</td> </tr> --> </table> </td> </tr> </table> </div> </td> </tr> </table> </div> </td> </tr> </table> </div> </td> </tr> <tr> <td> <div align="center"> <!--webbot bot="Include" U-Include="../html-include/footer.htm" TAG="BODY" startspan --> <table border="0" width="780" id="table1" cellpadding="0" style="border-collapse: collapse" height="63"> <tr> <td width="780" background="../html-include/images/foot7.jpg"> <p align="center"><b><font face="Arial" style="font-size: 8pt"><br> <br> <font face="Arial"> <a href="../_private/index.htm"> <span style="font-size: 8pt; text-decoration: none; color: #FFFFFF;">home</span></a></font><font color="#FFFFFF">&nbsp; |&nbsp;&nbsp;&nbsp; <span style="text-decoration: none; font-size: 8pt"> <a href="../articles.htm"> <span style="text-decoration: none; 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