1. 5/8/09 Titanium Performance Update 2 Dot Hill Confidential

2. May 2009 Dot Hill Confidential (Restricted Access) 2 Titanium Performance Update May 2009 Latest Titanium T100 numbers using the production target 6Gb hardware architecture (SAS2008 rev B1). Access Profile Mercury FC M110R19 (MT-32 1.8GHz) Titanium Turbo T100A29p (Tolapai 1.2GHz) Titanium vs. Mercury Comparison Sequential Disk Read (RAID5) FO: 676 MBps AA: 1328MBps FC SP: 387MBps FO: 898 MBps AA: 1794 MBps FC SP: 775MBps +33% Faster on deep queued large blocks, +100% Improved in single port throughput Sequential Disk Write (RAID5) FO: 452 MBps AA: 882 MBps FO: 780 MBps AA: 1449 MBps +72% Faster on deep queued large blocks Same Sector Cache Hit Read FO: 112K IOps Doubles for AA FO: 126K IOps Doubles for AA +12% Improved memory mapped IO Random Disk Read AA: 26.0K IOpsAA: 34.2K IOps 1KB size and QD = 8/drive +32% Additional total drive number supported (144 tested) Random Disk Write (RAID5) AA: 1790 IOps*, 102MBps * Lower queue depth AA: 3380 IOps, 187MBps 1KB size and QD = 8/drive +88% Faster on deep queued (QD 512 per port)

3. May 2009 Dot Hill Confidential (Restricted Access) 3 Titanium Sequential Performance Titanium is lower than Mercury on small block disk accessed reads (SC processor limited) Titanium catches up and out-performs Mercury on larger block accesses (64KB request size)  Throughput demanding streaming applications issue larger block requests

4. May 2009 Dot Hill Confidential (Restricted Access) 4 Titanium Sequence Performance Titanium has good throughput performance with no command queue (QD = 1) This dual host access profile has each streaming client issuing different geometry positions for a LUN Titanium Sequential Performance

5. May 2009 Dot Hill Confidential (Restricted Access) 5 Titanium Random Performance Titanium similar to Mercury on random reads for apples to apples (96 drive) configuration Titanium significantly out-performs Mercury on deep queued random write performance

6. May 2009 Dot Hill Confidential (Restricted Access) 6 Titanium Random Performance Titanium can deliver the higher random read transaction performance for 144 drives (IOpS 240/drive @ QD 8/drive) Test case shown is a single dual port host issuing 512 queues per FC port  Titanium has a similar issue as seen in M110R19 with additional drives on deep queued small block writes