Isilon and Ocarina Partner to Maximize Efficiency of File-Based Data Storage

Combination of New Isilon IQ 36NL and Ocarina ECOsystem Delivers Up to 10-to-1 Data Reduction and 90 Percent Utilization, Dramatically Decreasing Storage Footprint and Operational Costs

SEATTLE, WA — March 10, 2009 — Isilon® Systems (Nasdaq: ISLN - News), the proven leader in scale-out NAS, and Ocarina Networks, a leader in content-aware compression and dedupe for online storage, today announced an integrated nearline archive solution combining Isilon's new 36NL and Ocarina's ECOsystem storage optimization software. The new solution delivers up to 10-to-1 data reduction and average storage utilization rates of up to 90 percent, significantly reducing storage investment, footprint, power and cooling costs, and management time to dramatically lower the overall cost of storage.

"Millions of customers use our online photo processing services to share, store and print their digital images, generating massive amounts of user-generated content," said Graham Hobson, CTO, Photobox. "With continuously increasing user demand, we not only need highly scalable storage, but storage optimized to reduce footprint and operating costs, while still maximizing utilization. By deploying Isilon IQ and Ocarina ECOsystem, we've reduced our data by 30 percent, saving us 45 percent on our storage-related capital expenditures and $300,000 in power and cooling expenses. The investment paid for itself in the first six months."

The Ocarina ECOsystem provides content-aware compression and deduplication for the entire Isilon product line, but is specially optimized for the new 36NL. In combination with the 36NL, which features industry-leading utilization rates and scalability up to 3.45 petabytes (PB) in a single files system, Ocarina ECOsystem delivers a 20 percent improvement in system efficiency and up to 10-to-1 data reduction over traditional NAS systems utilizing conventional deduplication techniques. By delivering unprecedented storage utilization and data reduction rates, the new solution enables enterprise businesses in such industries as bioinformatics and Web 2.0 to optimize their file-based data storage for maximum efficiency and minimal cost, further reducing operational and capital expenditures while accelerating the performance of mission-critical applications.

"With capital and operational expenditures top-of-mind across the enterprise, deploying storage solutions that drive business value through greater efficiency and lower environmental costs is critical to advancing the bottom line," said Ram Appalaraju, vice president of marketing, Isilon Systems. "By combining Ocarina's innovative compression and dedupe solution with our new 36NL, we are enabling customers to derive maximum value from their nearline archive storage and improve operational efficiency for their file-based applications."

"In today's challenging economic environment, traditional storage utilization rates of 50 percent are simply unacceptable," said Dave Withers, vice president of strategic markets and business development, Ocarina Networks. "The integration of our leading content-aware storage optimization and data reduction solution with Isilon's new 36NL -- and its superior utilization rates -- eliminates inefficient and costly file-based data storage as a barrier to innovation and growth."

About Ocarina Networks
Ocarina is a leader in online storage optimization solutions. Organizations of all sizes use Ocarina's file-aware optimization technology to reduce their storage footprint and achieve a ten-fold capacity increase on their current storage systems. Based in San Jose, Calif., Ocarina is privately-held and financed by leading investors Kleiner Perkins Caufield & Byers and Highland Capital Partners.

For more information, visit http://www.ocarinanetworks.com.

About Isilon Systems
Isilon Systems (NASDAQ: ISLN - News) is the proven leader in scale-out NAS. Isilon's clustered storage and data management solutions drive unique business value for customers by maximizing the performance of their mission-critical applications, workflows and processes. Isilon enables enterprises and research organizations worldwide to manage large and rapidly growing amounts of file-based data in a highly-scalable, easy-to-manage, and cost-effective way.

Information about Isilon can be found at http://www.isilon.com.

Safe Harbor for Forward Looking Statements

This press release contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995 concerning the benefits of our products, technologies and services, and our ability to achieve our goals, plans and objectives in the current challenging macro- economic environment. These statements are not guarantees of future performance, but are based on management's expectations as of the date of this press release and assumptions that are inherently subject to uncertainties, risks and changes in circumstances that are difficult to predict.

Forward-looking statements involve risks, uncertainties, and assumptions. If the risks or uncertainties ever materialize, or the assumptions prove incorrect, our actual results may differ materially from those expressed or implied by our forward-looking statements. There can be no assurances that forward-looking statements will be achieved. Important factors that could cause actual results to differ materially from those indicated in forward- looking statements include the following: risks associated with anticipated growth in the storage of file-based data; competitive factors; our ability to build and expand our direct sales operations and improve our reseller distribution channels; general economic and industry conditions, including expenditure trends for storage-related products; new product introductions and our ability to develop and deliver innovative products; our ability to provide high-quality service and support offerings; our reliance on a limited number of suppliers and our ability to forecast demand for our products and potential shortages or price fluctuations in our supply chain; risks associated with international operations; and the current challenging macro-economic environment affecting the U.S. and global economies. These and other important risk factors and assumptions are detailed in our periodic reports and documents filed with the Securities and Exchange Commission, including our recently filed Annual Report on Form 10-K for the fiscal year 2008, and could cause actual results to vary from expectations. The Company makes no commitment to revise or update any forward-looking statements in order to reflect subsequent events or circumstances.

The names of companies mentioned herein are the trademarks of their respective owners.

# # #

Product or service names mentioned herein are the trademarks of their respective owners.

Media Contacts:
Melissa Biles or Virginia Zimpel
LaunchSquad
415.625.8555
ocarina (at) launchsquad (dot) com