2. DAC-FL The Ultimate External RAID Controller Solution for High Performance Servers, Clusters, and Storage Area Networks (SAN)

3. WEB:Q1’99 -- DAC-FL Corporate Summary Founded in 1983 Headquarters in Fremont, California Publicly traded on NASDAQ as MYLX #1 Supplier of RAID controllers in the worldwide non-captive marketplace Shipped over 725,000 RAID controllers to date $123.6M in revenue in 1997 Market cap of approx. $200M 350 employees

4. WEB:Q1’99 -- DAC-FL Industry Leadership #1 supplier of RAID controllers in the world! –DataQuest/Gartner (Sept., 1998) –International Data Corporation (Oct., 1998) –Disk Trend (1998, 1997, 1996, 1995 reports)

5. WEB:Q1’99 -- DAC-FL The Mylex Mission To be the dominant supplier of intelligent products for moving, storing, protecting and managing data SCSI Chips and ASICs Low-Cost PCI RAID High-Performance PCI RAID External RAID Controllers System Board RAID RAID Management Software

6. WEB:Q1’99 -- DAC-FL Product strength, depth and breadth Cost Effective PCI RAID Solutions for: Entry Level Servers Win/tel based Workstations High-end Desktop Systems High Performance PCI RAID Solutions for: Mid-level Servers High-end Servers External RAID Solutions for: Enterprise Class Servers Clustering and High Data Availability Applications Storage Area Networks

7. WEB:Q1’99 -- DAC-FL World Record Setting Enterprise Class Performance* 6 Processors- Pentium Pro (200MHz) 8 Processors - Pentium Pro (200MHz) HP Mylex DACPJ16,257 tpm Mylex DACPJ Other Mylex DACPJ Fujitsu 13,391 tpm 16,216 tpm 16,101 tpm 14,144 tpm 13,728 tpm 13,391 tpm Bull NEC DG NEC Unisys Fujitsu *As of 8/98 4 Processors- Pentium® Xeon™ (400MHz) NECMylex DACPJ18,322 tpm Mylex DACPJ Other Mylex DACPJ 18,154 tpm 18,127 tpm 17,700 tpm Unisys Compaq Unisys 8/5/98 Express5800 HX4500 C/S 7/16/98 Aquanta QS/2 Server C/S 6/26/98 Proliant 7000-6/400-MI C/S 6/29/98 Aquanta QS/2 Server C/S 3/30/98 NetServer LXr Pro 8 3/25/98 Express5800 HV8000 C/S 3/18/98 Express5800 HV8000 C/S 3/2/98 AViiON AV 8600 Server 3/18/98 Express5800 HX4500 C/S 4/10/98 Aquanta HS/6 Server C/S 2/5/98 GRANPOWER 5000 Model 670 C/S 2/5/98 teamserver M796i C/S

8. WEB:Q1’99 -- DAC-FL Mylex Leadership Technology Expertise 1993 1998 1995 1996 1994 #1 in TPC-C Performance #1 in TPC-C Price/Performance Advanced I/O Design Ultra2 SCSI LVD Fibre Channel Ultra3 SCSI Fibre Channel 2 ASIC Development RAID co-processor with XOR and memory control SCSI I/O co-processor chips Local and Remote RAID management software Software drivers and utilities Firmware Development RAID firmware for SCSI and Fibre Channel I2O development Systems Level Redundant designs PCI Advanced Architectures 64-bit 66 MHz 1990 1989 1992 1991 1997

9. DAC-FL A host independent external RAID controller combining Fibre Channel and Ultra2 SCSI LVD to provide exceptionally high performance with multiple disk drive architectures for extremely large system solutions. DAC-FL

10. WEB:Q1’99 -- DAC-FL DAC-FL: Target Markets Enterprise Servers Mid Range Performance Desktop PCs Entry Level Servers Commodity PC Market (Including Mobile) AcceleRAID 200 eXtremeRAID- 1100 DAC960-PJ DAC960-PG AcceleRAID 250 DAC-FF DAC-FL DAC-SF DAC-SX AcceleRAID 150

11. WEB:Q1’99 -- DAC-FL DAC-FL: Technology

12. WEB:Q1’99 -- DAC-FL DAC-FL: RAID Technology Fibre Technology – Fibre Channel Host connectivity – Data Transfer rates of 100MB/s over a 30 Meter serial link – Distances of several kilometers via Fibre Hubs and switches Ultra2 SCSI LVD – 80MB/s drive data transfer rates – Cable lengths: Up to 12 meters parallel SCSI – Backward compatible with Ultra, FAST and older SCSI Proven system architecture –Dual RISC processor –Common Management software

13. WEB:Q1’99 -- DAC-FL DAC-FL: Hardware Dual RISC Processors (i960RP + i960RD) Symbios 53C896 SCSI chips Firmware: 1MB Flash EEPROM Up to 256 MB Data Cache Dual PCI Bus design 5 1/4” form factor 2 Copper FC-AL host channels Sustained cache transfer rates: Up to 97 MB/s per host channel 4 Ultra2 SCSI LVD drive channels Up to 15 devices per Ultra2 SCSI channel - 60 devices per controller Up to 1.08TB capacity per controller Sustained disk transfer rates: over 52MB/s

14. WEB:Q1’99 -- DAC-FL DAC-FL: Hardware 2 FC-AL channels 256 MB memory Dual RISC Processors (i960RP + i960RD) 4 Ultra2 SCSI

15. WEB:Q1’99 -- DAC-FL RAID 0, 1, 0+1, 3, 5, 10, 30, 50 and JBOD Write Through and Write back or read-ahead support Onboard Firmware Variable Stripe size per controller Variable Cache Line size per controller Mirrored Cache Clustering Support -- Windows NT, UNIX, SCO UNIX, NetWare Designed to fit in an Industry standard 5 1/4” half-height form factor DAC-FL: Features

16. WEB:Q1’99 -- DAC-FL DAC-FL: GAM Features Network Security Levels Guest Access Admin Access Online capacity expansion Remote Instrumentation DMI SNMP SMART Support Wizard Configuration Global Array Manager tm software Flash upgradeable F/W OS-Independent Server API Performance Monitoring Controller Statistics Drive Statistics Historical Statistics

17. WEB:Q1’99 -- DAC-FL DAC-FL: Advanced RAID Features Fault Tolerance: –Automatic detection of Failed drives –Automatic and transparent re-build of replacement drive –On-line RAID expansion –Hot Spare drive support –Hot Drive Swapping support –SAF-TE and SES enclosure management –RAID configuration stored on disk and NVRAM

18. WEB:Q1’99 -- DAC-FL Simplex Performance and Capacity Performance SXSFFL FF Burst IO’s Per Second 1,800 4,100 4,100 6,000 Burst (cache) Bandwidth (MB/s) 45 97 97194 Sustained (disk) Bandwidth (MB/s) 30 52 52125 Note: Sequential read performance, small blocks, no coalescing driver. Storage SXSF FL FF Disks75* 90 60500** Terabytes (9 GB)7.8.5 4.5 Terabytes (18 GB)1.41.61.0 9.0 * Single host channel ** Single ported disks

19. WEB:Q1’99 -- DAC-FL Duplex Performance and Capacity Performance SX SF FL FF Burst IO/s Per Second 3,600 8,200 8,200 12,000 Burst (cache) Bandwidth (MB/s)90194194 388 Sustained (disk) Bandwidth (MB/s)50100 100 225 Notes: 1. Sequential read performance, small blocks, no coalescing driver. 2. Burst rates are 2x simplex configuration. 3. Sustained rates are generally 1.9x simplex configuration (active-active overhead). Storage SX SFFL FF Disks 70* 94 60 500** Terabytes (9 GB).6.8.5 4.5 Terabytes (18 GB)1.2 1.61.0 9.0 * One host channel ** Single ported disks

20. WEB:Q1’99 -- DAC-FL DAC-FL: Benefits Unparalleled Performance –Dual RISC Processors--i960RD & i960RP –Ultra2 SCSI (LVD) interface at 80MB/s per channel –Sustained Disk transfer rates: over 52MB/s –Dual Loop Fibre host channels –Burst Cache transfer rates: up to 97MB/s per channel –Mylex Firmware + Software Flexible Storage & Fault Tolerance –Feature rich RAID –NT and Unix Clustering –Storage Area Networks (SAN) –Mirrored Cache –RAID expansion (MORE1) Configuration & Remote Management –Global Array Manager (GAM) –Client Server GUI –Create, Manage, Expand and Monitor

21. WEB:Q1’99 -- DAC-FL DAC-FL: Target Applications Designed for $15K to $150K servers –Departmental to Enterprise NT Servers –Low-end to Mid-Range UNIX Systems –3,000 to 30,000 IOs per second –10s of GBs to 10s of TBs Designed for Clusters –NT (Cluster Server), NetWare Wolf Mountain and UNIX clusters –Support for Storage Area Networks (SAN) –Active / Active Duplex Configurations –Concurrently operation--> performance –Transparent failover / failback --> non-stop operation –Mirrored cache architecture --> guaranteed data integrity

22. WEB:Q1’99 -- DAC-FL Product Line Features Fibre Channel Support -->Performance/Scalability Active-active ---> Performance/Fault Tolerance Failover/failback ---> Data Availability Cache mirroring ---> Data Integrity Ultra2 SCSI LVD ---> Performance/Scalability /Legacy Support

23. WEB:Q1’99 -- DAC-FL Active / Active Operation u Concurrent I/O service from single or multiple servers to dual controllers increase performance Controller 0Controller 1 Are you there and alive? AB

24. WEB:Q1’99 -- DAC-FL Active / Active Failover If a controller fails, “failover” is transparently initiated Surviving controller assumes the failed controller’s address and services I/O’s from both servers Controller 1 AB Controller 0

25. WEB:Q1’99 -- DAC-FL Active / Active Failback u When the failure is fixed, “failback” is automatically initiated u Failover / failback is transparent to users and applications and enables failure tolerant systems Controller 0 A Controller 1 B

26. WEB:Q1’99 -- DAC-FL Entry Level Fiber u Single Node, Single HBA and Host Loop, Dual FL’s FC HBA FL Controller 1 Port 0 Active Port 1 Active

27. WEB:Q1’99 -- DAC-FL Performance Scaling With Fibre Single Node, Dual HBA’s and Host Loops, Dual FL’s FC Hub FC HBA FL Controller 1 Port 0 Active Port 1 Active FL Controller 0 Port 0 Active Port 1 Active FC HBA

28. WEB:Q1’99 -- DAC-FL Fault Tolerant Fibre I/O Single Node, Dual HBA’s and Host Loops, Dual FL’s FC Hub FC HBA FL Controller 1 Port 0 Active Port 1 Inactive FL Controller 0 Port 0 Active Port 1 Inactive FC HBA

29. WEB:Q1’99 -- DAC-FL Fault Tolerant Computing -- Wolfpack Dual Nodes, Single HBA’s and Host Loops, Dual FL’s FC Hub FC HBA FL Controller 1 Port 0 Active Port 1 Inactive FL Controller 0 Port 0 Active Port 1 Inactive FC HBA

30. WEB:Q1’99 -- DAC-FL Parallel App Clusters - Wolfpack-II N-Node, Switched Fibre, N-FF’s Arrays, FCAL to Disk FC Switch FF Controller 1 Port 0 Active Port 1 Active FF Controller 0 Port 0 Active Port 1 Active FC HBA FF Controller 1 Port 0 Active Port 1 Active FF Controller 0 Port 0 Active Port 1 Active FC HBA

31. WEB:Q1’99 -- DAC-FL Parallel App Clusters -- SAN / VIA N-Node, Switched ServerNet (?), N-FF’s Arrays, FCAL to Disk SAN Switch FF Controller 1 Port 0 Active Port 1 Active FF Controller 0 Port 0 Active Port 1 Active SAN HBA FF Controller 1 Port 0 Active Port 1 Active FF Controller 0 Port 0 Active Port 1 Active SAN HBA

32. DAC-FL The Ultimate External RAID Controller Solution for Departmental Servers and Clusters