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P/N: MKT102-011 DAC960PJ vs. AMI 434 4

Introduction

The purpose of this document is to present a product comparison between the Mylex

DAC960PJ and the AMI MegaRAID Series 434 RAID controllers.

Because the AMI 434 controller is targeted at the server segment of the PC market, the

performance analysis contained in the first part of this document will concentrate on this

environment. A detailed feature comparison is included in the second part.

Performance Analysis

File and application servers predominantly use RAID level 5 when it is available. RAID

5 provides the best efficiency in performance and capacity, with full protection from

single drive failures.

The benchmark data contained in this document focuses on providing the RAID 5

performance data necessary to set up the best real world server solution. Every effort has

been made to ensure that the optimal configuration resulting in the best performance

numbers was used for both RAID controllers.

Benchmark Configuration

Benchmark programs measuring an I/O subsystem generally does one of two things:

§ measure how the I/O subsystem performs in a simulated application environment,

taking into account the overhead that it might impose on the overall system

§ measure the performance characteristics of an I/O subsystem in very specific terms,

such as sequential or random I/O.

This document presents the performance data on Windows NT using Ziff-Davis

ServerBench for the application benchmark test and Intel Galileo for the performance

characteristics benchmark test.

ServerBench is a popular industry-standard benchmark program measuring how a server

performs with multiple copies of application loads using many client workstations to

drive the workload. Galileo, on the other hand, is a test and measurement tool, allowing a

multitude of settings to measure and fine tune the performance of an I/O subsystem.

Galileo is used here to measure the raw characteristics of the controllers. Both tests run

under Windows NT 4.0.

Compaq Proliant 5000 with dual-Pentium Pro 200MHz CPU was chosen as the server

test platform, since its configuration reflects what is predominant in the market for server

platforms. The Compaq system consists of an 8-drive RAID 5 disk array across two

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Mylex DAC960PJ Manual de usuario Pagina 4