Arena Pharmaceuticals Selects Dot Hill's SANnet System for Drug Discovery Database.

Business Editors/High-Tech Writers

CARLSBAD, Calif.--(BUSINESS WIRE)--Aug. 7, 2001

Dot Hill Systems Corp. (NYSE:HIL), a leading provider of carrier-class information storage and storage area network (SAN) solutions, today announced that Arena Pharmaceuticals Inc. (Nasdaq:ARNA), has selected Dot Hill's SANnet(TM) system as the storage component of the Arena Database, a proprietary drug discovery database.

"Drug discovery, particularly when based upon drug screening at multiple drug targets, generates enormous amounts of data. This can cause at least two significant problems from a data management perspective: (1) how to store the data, and allow scientists from different scientific groups to have real-time access to all data related to their projects; and (2) how to ensure that data that may not apply in one project is not discarded, with the understanding that such data may be important for a solution in another project," said Jack Lief, Arena's chief executive officer and president. "We chose Dot Hill's SANnet system to store our scientific data and other information based on its small footprint, scalability, and performance. We especially liked the ease of use of the SANpath(TM) storage management software."

James Lambert, Dot Hill president, said, "It's exciting to provide Arena with the reliable storage systems and support they require. SANnet decreases the amount of time their scientists spend searching through large quantities of data, which leads to faster drug discovery. Our systems are currently storing almost four terabytes of Arena information and this amount of data is projected to grow substantially. As Arena's storage needs grow, our SANnet systems will cost-effectively scale to grow with them."

About Dot Hill

Dot Hill is a leading independent provider of carrier-class data storage solutions and services. With SANnet solutions that include storage area networks, NEBS Level 3 certified systems for Telco and Internet operations, and world-class service capabilities, Dot Hill is uniquely positioned to address the storage requirements of mission-critical continuous computing environments. Dot Hill's customers include many of the world's leading Internet service providers, financial institutions, advanced technology and telecommunications companies, and government agencies. Dot Hill is an ISO 9002 certified company, and its Web site is www.dothill.com.

About Arena Pharmaceuticals

Arena is an emerging biopharmaceutical company focused principally on discovering pharmaceutical products that act on an important class of targets called G protein-coupled receptors, or GPCRs. Arena has developed a technology called Constitutively Activated Receptor Technology, or CART(TM), that can be applied to GPCRs and other receptors.

Dot Hill, the Dot Hill logo, and SANnet are all trademarks of Dot Hill Systems Corp. All other products and names mentioned herein are trademarks or registered trademarks of their respective owners.

Certain statements contained in this press release regarding matters that are not historical fact are "forward-looking statements" within the meaning of the Private Securities Litigation Reform Act. Because such statements are subject to risks and uncertainties, actual results may differ materially from those expressed or implied by such forward-looking statements. Such statements include the future availability of SANnet and the amount of revenue associated with sales to Arena Pharmaceuticals. The risks that contribute to the uncertain nature of the forward-looking statements include: the terms of the relationship with Arena Pharmaceuticals, which do not provide for any minimum purchase amount, and any unforeseen technological, intellectual property or engineering issues and changing customer preferences. However, there are many other risks not listed here that may affect the future business of Dot Hill, as well as the forward-looking statements contained herein. To learn about such risks and uncertainties, you should read the risk factors set forth in the forms 10K and 10Q recently filed by Dot Hill. All forward-looking statements contained in this press release speak only as of the date on which they were made. Dot Hill undertakes no obligation to update such statements to reflect events that occur or circumstances that exist after the date on which they were made.