Innovative Storage Solutions From Dot Hill Systems

1. Innovative Storage Solutions From Dot Hill Systems

2. Dot Hill Corporate Update Provider of OEM Storage Solutions Over 280,000+ Systems In Use Worldwide 40+ OEM & SI Partners Worldwide Headquartered In Carlsbad, California Technology Development Centers Longmont, CO Minneapolis, MN 260+ Employees In 9 World-Wide Locations Over 40% Engineering $272.9M annual sales in 2008 Q1 Financial Results Revenues $53.9M <$2.3M> Loss = $.05 vs $.6-$.10 Forecasted $54.3M Cash Q1 Highlights Tier 1 Server OEM Win with RAIDCore 1st to Market with 2U RAID Using 2.5� Drives

3. Corporate Milestones Aug 1999 Dot Hill founded through merger of Box Hill Systems and Artecon Inc. Feb 2004 Acquisition of Chaparral, establish design center in Longmont Colorado (LTC) Jan 2006 Announce technology partnership with Fujitsu-Siemens Jan 2008 Announce extension of private label OEM agreement with HP from one to five years. Sept 2008 Enter into manufacturing, assembly, and testing partnership with Foxconn Sep 2008 Acquisition of Ciprico RAIDCore and NAS platform intellectual property Feb 2009 Report record FY2008 revenues of $273 million 3

4. Product Milestones Oct 2006 Release of the first R/Evolution series platform 4G FC host (2730) Oct 2006 Shipment of 100,000th unit of Sun StorageTek 3000 family of SCSI workgroup storage systems Apr 2008 Release of first R/Evolution class 3G SAS host storage controller (2530) Oct 2008 Awarded patents for mirrored writes (SimulCache), Battery free Cache backup (EcoStor) and performance improvements through use of DMA Nov 2008 Announced support of DC power options for 2000/5000 series products Jan 2009 Release of Industry first 2U24 FC/SAS host and complimentary JBOD Storage platforms Jun 2009 Announced new 3000 series with 6Gb backend and 8G FC host interface July 2009 Announced support for 2TB SATA drives 4

6. Key OEM Partnerships Highlight the financial strength of the company (debt free, cash rich) Small but significant, flexible to customer requirements. Benefits of Chaparral acquisition Full IP ownership Both board level and system supplier Combined customer base 42% of employees are in R&D, developing new product and product enhancements Highlight the financial strength of the company (debt free, cash rich) Small but significant, flexible to customer requirements. Benefits of Chaparral acquisition Full IP ownership Both board level and system supplier Combined customer base 42% of employees are in R&D, developing new product and product enhancements

7. Networked Storage Market Size Band 1 � Highest growth but smallest market (1%) in 2008 Bands 2/3 � 2nd highest growth; $2.2B (11%) in 2008 Bands 4/5 � 3rd highest growth; $9.7B (49%) in 2008 Bands 6-9 � Negative growth; $7.5B (38%) in 2008

8. Key Target Markets Networked Storage $11.9BN in 2008 (IDC) $2.2B entry level $9.7B mid level SAN and DAS disk arrays Focus on entry level dominance Data Protection Software $10BN software market $17BN by 2012 (IDC) Disaster recovery for local and remote sites Focus on snapshot, clone, replication & software RAID

9. Core Competence

10. Why Dot Hill? Exceptional execution at Tier 1?2 OEMs HP, Netapp, Sun, Fujitsu-Siemens?Stratus, Motorola, NEC Quality excellence and time to market leader Flexibility, Responsiveness and Time to Market advantages Technology that matters EcoStor� - eliminates annual batteries and maintenance SimulCache� - highest performance hardware failover RAIDCore� - eliminates expensive hardware from servers Product excellence Proven robustness and maturity Excellent price/performance and OEM differentiation Portfolio to address multiple markets Technology leadership � numerous patents held Unified product architecture � with rapid evolution

11. R/Evolution Architecture

12. You Have Choices � Why Dot Hill Product Family Learn one � understand them all Easy Sell Sell the customer on storage, THEN ask what type of interface they need Flexibility, Flexibility, Flexibility Interface flexibility Performance flexibility Drive type flexibility

13. R/Evolution Architecture Overview Modular Design with Maximum Redundancy Compact 2U, 12 or 24 Drive Form Factor Single or Dual Controllers with dual host ports Redundant, hot swap components Common Elements Firmware Data Management Software Field Replaceable Units (FRU)s Unrivaled Data-in-place Migration AC/DC Power Options Advanced Technology EcoStor� battery-free cache backup SimulCache� low latency cache mirroring Nebs Level 3/MIL-STD-810F compliant 13

14. Dot Hill Competitive Features Battery-Free Cache Protection Uses super capacitors and compact flash for cache backup Better Data Protection Environmentally responsible Outstanding Financial Benefits SimulCache� Technology High Performance / Low Latency Cache Mirroring Better Write Performance Mirrored Writes Are 92% More Efficient Than Non-mirrored Reduces Load On Controller Processor & I/O Bus Better Data Protection Data Management Services Data Protection Snapshots / Volume Copy / Remote Replication Simplify and Reduce Management Costs VSS / VDS / MPIO Certifications Mil Spec, NEBS, Microsoft, VMware, � EcoStor�s Super Capacitor & Compact Flash solution is the future of environmentally friendly cache protection. It also provides superior cache protection with power failures as well as brown outs. In the event of a brown out, along with writing the data to a non-volatile backup with unlimited back up time, it also retains the data in cache for up to 30 seconds thus removing the necessity of cache resync. Unlike batteries which can take hours to return to a full charge, EcoStor Super Capacitor & Compact Flash solution gets back in minutes. This alone removes one more exposure to potential data loss during the recharge time. Another thing to stress is the fact batteries are like a data �time bomb�, if you don�t address the outage before the battery totally drains, the data is lost. EcoStor Super Capacitor & Compact Flash solution removes this exposure as well. Total cost of ownership is also reduced because batteries only last, at best, 3 years�.EcoStor�s Super Capacitor & Compact Flash solution is the future of environmentally friendly cache protection. It also provides superior cache protection with power failures as well as brown outs. In the event of a brown out, along with writing the data to a non-volatile backup with unlimited back up time, it also retains the data in cache for up to 30 seconds thus removing the necessity of cache resync. Unlike batteries which can take hours to return to a full charge, EcoStor Super Capacitor & Compact Flash solution gets back in minutes. This alone removes one more exposure to potential data loss during the recharge time. Another thing to stress is the fact batteries are like a data �time bomb�, if you don�t address the outage before the battery totally drains, the data is lost. EcoStor Super Capacitor & Compact Flash solution removes this exposure as well. Total cost of ownership is also reduced because batteries only last, at best, 3 years�.

15. Key Customer Benefits Continuous Availability Performance levels previously available only in high-end storage solutions Optimum flexibility Dynamic online scalability Easy to use and maintain Cost-effective solution for I/O-intensive or high-bandwidth data traffic Advanced software features Environmental Benefits Here are the key benefits you need to drive home with your customers. The redundancy and fault tolerance designed into the ftScalable storage delivers on each one of these items.Here are the key benefits you need to drive home with your customers. The redundancy and fault tolerance designed into the ftScalable storage delivers on each one of these items.

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17. R/Evolution 2U12 Family Line Up

18. 2U24 2.5� drive storage system 2U12 and 2U24 use the same power supply and compatible mid-plane as other members of the R/Evolution Architecture family 24 x 2.5� HDDs in 2u Chassis (vs. 12 x 3.5� HDDs)

19. 2.5� drive storage system Midplane layout

20. Neptune (2000) / Mercury (20x2) comparison

21. Neptune / Mercury comparison

22. R/Evolution 2U24 2x22 Series 22

23. R/Evolution 2U12 2x32 Series (Sept)

24. Entry Level Product Refresh Dot Hill�s 2009 product strategy � � a refresh of the Entry Level 2000 Series � � the Dot Hill 3000 Series Laying the groundwork for the next generation Higher processor performance and I/O speeds Support for enhanced and new DMS functionality Latest generation components for low cost and long lifecycles New Controller Design PCI Express Architecture Intel EP80579 (Tolapai) System-on-a-chip Processor 2 ports on main board, optional 2 port mezzanine card Existing 2u12 and 2u24 chassis support 2.5�, 3.5�, SAS, SATA and SSD support 24

25. 3000 Series Highlights Next generation Dot Hill Array platform 8G Fibre Channel 8G/1G Fibre Channel/iSCSI hybrid 6G SAS JBOD and RAID 10G iSCSI and FCoE Disk technologies: SAS, SATA and SSD R/Evolution� modular architecture 6GB SAS back-end drive support AssuredSnap, Copy and Remote Snapshot support 2U/12 and 2U/24 form factors NEBS compliant with AC and DC power choices Introduction starting Fall 2009, sampling July 2009 (Beta program) 25

26. 3000 Series Product Lineup 26

27. R/Evolution 3000 Series 27

28. 3000 vs. 2000 Comparison 28

29. 3000 vs. 2000 Comparison (cont..) 29

30. 3730 Performance Comparison 30

31. Competition 31

32. Family of Scaled Solutions 32

33. Expansion JBOD Support 2u RAID, 144 drives 2.5 or 3.5� RAID head, 2u24 shown 33

34. Data Protection Services AssuredSnap (Snapshots) Point-in-time logical image of a physical volume Protect against accidental or malicious loss or corruption of data AssuredCopy (Volume Copy) Complete physical and independent copy of a volume Additional protection against complete vdisk or volume failure Mitigates multiple application I/O contention (e.g., production vs. data mining) AssuredSnap/R (Remote Snapshot Replication) Remote data replication Disaster Recovery capability Centralized backup 34