Compaq 108164-003 - ProLiant - 800 Guide de référence rapide

WHITEPAPER

444A/0696

June 1996

Prepared By

Os Development

Compaq Computer

Corporation

CONTENTS

Test Configuration.......... 3

Introduction .........................3

LoadSim..............................3

Performance Monitor.............8

Configuration of Test Facility.8

Performance

Results..........................10

Introduction ........................10

Processor Subsystem...........10

Disk Subsystem...................18

System Memory...................19

Conclusions and

Recommendations...............21

Performance of Microsoft Exchange

Server 4.0 on Compaq ProLiant Servers

Electronic messaging is consistently becoming more pervasive in the business world. As

people must process increasing amounts of information, there is a need for powerful

software and hardware products to satisfy the requirements imposed.

To fill the need for a powerful messaging software product, Microsoft has created

Microsoft Exchange Server 4.0. This product has been the focal point of extensive

development and testing efforts involving the commitments of both Microsoft and its

partners. During this time, Compaq and Microsoft have worked together to optimize

Microsoft Exchange Server on Compaq System products.

Microsoft Exchange Server is enormously complex, with many features and capabilities.

One important part of understanding the product is understanding its performance. For

system administrators and potential purchasers of both Microsoft Exchange Server and

Compaq products, this aspect of Microsoft Exchange Server is crucial to understand so

the proper decisions can be made.

This white paper covers various performance aspects of Microsoft Exchange Server 4.0

on Compaq ProLiant Servers, specifically the ProLiant 4500 and the ProLiant 5000.

Fundamentally, this paper should provide the reader with an expectation of how

Microsoft Exchange Server will perform on a Compaq ProLiant under various user

loads. Furthermore, the paper should uncover other useful information pertaining to

Microsoft Exchange Server configuration and performance tuning, as well as CPU,

RAM, and disk utilization on Compaq ProLiant servers. Ultimately, this paper should

help the potential purchaser make good decisions about which Compaq products to

purchase in order to satisfy the requirements of his or her business needs.

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NOTICE

The information in this publication is subject to change without notice.

COMPAQ COMPUTER CORPORATION SHALL NOT BE LIABLE FOR TECHNICAL

OR EDITORIAL ERRORS OR OMISSIONS CONTAINED HEREIN, NOR FOR

INCIDENTAL OR CONSEQUENTIAL DAMAGES RESULTING FROM THE

FURNISHING, PERFORMANCE, OR USE OF THIS MATERIAL.

This publication does not constitute an endorsement of the product or products that were tested.

The configuration or configurations tested or described may or may not be the only available

solution. This test is not a determination of product quality or correctness, nor does it ensure

compliance with any federal, state or local requirements. Compaq does not warrant products other

than its own strictly as stated in Compaq product warranties.

Product names mentioned herein may be trademarks and/or registered trademarks of their

respective companies.

Compaq, ProLiant, and NetFlex, registered United States Patent and Trademark Office.

Other product names mentioned herein may be trademarks and/or registered trademarks of their

respective companies.

Microsoft, and Windows NT, are trademarks and/or registered trademarks of Microsoft

Corporation.

Performance of Microsoft Exchange Server 4.0

on Compaq ProLiant Servers

First Edition (June 1996)

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444A/0696

TEST CONFIGURATION

Introduction

Before diving right into the performance results, it is important to take a few minutes and review

the tools and configuration used to arrive at these results.

There are two main tools used to prepare the data for this white paper:

• Microsoft Exchange ServerLoadSim

• Microsoft Windows NT Performance Monitor

Naturally, your results will vary depending upon your exact conditions. In other words, the results

shown probably won’t be exactly what you will see. However, the trends should be the same.

Additionally, the configuration of test loads selected for this paper are a good overall mix of

potential real world situations. If anything, the load is a bit on the heavy side, so it should

illustrate a worst case scenario for most Exchange users. In other words, most likely your user

load won’t be heavier than the loads used in these tests, and as a result your performance should

be at least as good as, if not better than, the performance shown here.

LoadSim

The main tool used in generating the performance data contained in this paper is the Microsoft

Exchange Server User Load Simulation utility - calledLoadSim.

As its name implies,LoadSim is a tool for simulating a client user load on an Exchange Server.

Its purpose is to enable a single Windows NT machine - called aLoadSim client - to simulate

multiple Microsoft Exchange client users.

For more information on the details ofLoadsim operation and configuration, refer to the

Microsoft white paper entitled, “LoadSim: Microsoft Exchange Server Load Simulation Tool for

Microsoft Exchange 4.0”. This paper is included with theLoadSim utility, and they can both be

found on the Microsoft Exchange Server CD in the \SUPPORT\LOADSIM directory.

The operation ofLoadSim users is governed by aLoadSim profile, which is stored on disk as a

.SIM file. This profile controls things like how long aLoadSim ‘day’ is, how many email

messages to send in a day’s time, how many times to open and read existing email, whether to use

distribution lists, whether to use public folders, etc.

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Default User Profiles

There are three pre-configuredLoadSim profiles which are built intoLoadSim:Light, Medium,

and Heavy.

DEFAULTLOADSIM USERPROFILES

LoadSim USER ATTRIBUTE ATTRIBUTE DETAIL LIGHT MEDIUM HEAVY

TEST DURATION Length of a day (hours) 888

READING MAIL New mail (times/day) 12 12 12

Existing mail (times/day) 5 15 20

AFTER READING MAIL % of Reply 5% 7% 15%

% of Reply All 3% 5% 7%

% of Forward 5% 7% 7%

% of Move 20% 20% 20%

% of Copy 0% 0% 0%

% of Delete 40% 40% 40%

% of Do nothing 27% 21% 11%

DISTRIBUTION LISTS Minimum size 444

Maximum size 50 50 50

Average size 10 10 10

Cover 100% of users (no overlap) Yes Yes Yes

ATTACHMENTS % to Run/Load Mail Attachment (if one exists) 25% 25% 25%

INBOX SIZE Inbox Size Limit (# messages) 20 125 250

SENDING MAIL New mail (times/day) 246

Save a copy in Sent Mail Folder? Yes Yes Yes

Number of random recipients 333

% of time to add a Distribution List 30% 30% 30%

Message Priority Normal Normal Normal

Delivery Receipt? No No No

Read Receipt? No No No

NEW MAIL MESSAGE CONTENT

Text-only, no attachment 1K body (ups1K.msg) 90% 64% 50%

2K body (ups2K.msg) 0% 17% 10%

4K body (ups4K.msg) 0% 4% 5%

NEW MAIL MESSAGE CONTENT

1K mail body, with attachment 10K attachment (ups10Kat.msg) 10% 5% 10%

Embedded bitmap object (upsBMobj.msg) 0% 2% 5%

Word attachment (upsWDatt.msg) 0% 2% 5%

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LoadSim USER ATTRIBUTE ATTRIBUTE DETAIL LIGHT MEDIUM HEAVY

Excel attachment ( upsXLatt.msg) 0% 4% 5%

Embedded Excel object (upsXLobj.msg) 0% 2% 10%

SCHEDULE+ CHANGES Changes per day 1 5 10

Update Free/Busy information? No No No

Average Schedule File Size 22KB 22KB 22KB

PUBLIC FOLDERS Folder activity None None None

CALCULATED DAILY LOAD

(based on these defaults) TOTAL MAIL RECEIVED PER DAY 22.94 66.30 118.89

CALCULATED DAILY LOAD

(based on these defaults) TOTAL MAIL SENT PER DAY 4.70 14.18 30.67

Mail sent as New mail 2.00 4.00 6.00

Mail sent as a Reply 1.05 3.76 13.03

Mail sent as a Reply to All 0.60 2.67 5.82

Mail sent as a Forward 1.05 3.76 5.82

CALCULATED DAILY LOAD

(based on these defaults) AVERAGE # RECIPIENTS FOR EACH

MESSAGE 4.88 4.68 3.88

Table 1. DefaultLoadSim user profile definitions

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User Profile Definition for This Paper

The actual LoadSim user profile used in these tests is based on theMediumuser profile. In the

following table, deviations from the standardMediumprofile are in bold.

LOADSIM USERPROFILE FOR THIS PAPER

LoadSim USER ATTRIBUTE ATTRIBUTE DETAIL

TEST DURATION Length of a day (hours) 8

READING MAIL New mail (times/day) 12

Existing mail (times/day) 15

AFTER READING MAIL % of Reply 7%

% of Reply All 5%

% of Forward 7%

% of Move 20%

% of Copy 0%

% of Delete 40%

% of Do nothing 21%

DISTRIBUTION LISTS Minimum size 4

Maximum size 50

Average size 12

Cover 100% of users (no overlap) Yes

ATTACHMENTS % to Run/Load Mail Attachment (if one exists) 25%

INBOX SIZE Inbox Size Limit (# messages) 125

SENDING MAIL New mail (times/day) 4

Save a copy in Sent Mail Folder? Yes

Number of random recipients 3

% of time to add a Distribution List 30%

Message Priority Normal

Delivery Receipt? No

Read Receipt? No

NEW MAIL MESSAGE

CONTENT 1K body (ups1K.msg) 64%

Text-only, no attachment 2K body (ups2K.msg) 17%

4K body (ups4K.msg) 4%

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LoadSim USER ATTRIBUTE ATTRIBUTE DETAIL

NEW MAIL MESSAGE

CONTENT 10K attachment (ups10Kat.msg) 5%

1K mail body, with attachment Embedded bitmap object ( upsBMobj.msg) 2%

Word attachment (upsWDatt.msg) 2%

Excel attachment ( upsXLatt.msg) 4%

Embedded Excel object (upsXLobj.msg) 2%

SCHEDULE+ CHANGES Changes per day 5

Update Free/Busy information? No

Average Schedule File Size 22KB

PUBLIC FOLDERS Public folder tasks? Yes

Number of times/day to open public folders 5

% of time to open active folders 60%

Read old item 4%

Read new item 15%

Change view 7%

Delete item 3%

Post items 5%

Items to post 1

Reply 5%

Reply to author 0%

Forward item 0%

Copy item 5%

Move item 5%

Modify item 5%

% of time to do resolve-as-all 30%

CALCULATED DAILY LOAD

(based on these defaults) TOTAL MAIL RECEIVED PER DAY 76.76

CALCULATED DAILY LOAD

(based on these defaults) TOTAL MAIL SENT PER DAY 15.11

Mail sent as New mail 4.00

Mail sent as a Reply 4.10

Mail sent as a Reply to All 2.91

Mail sent as a Forward 4.10

CALCULATED DAILY LOAD

(based on these defaults) AVERAGE # RECIPIENTS FOR EACH MESSAGE 5.08

Table 2.LoadSim user profile definition for this paper

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LoadSim Score

The data point resulting from aLoadSim run is called theScore. The LoadSim Score represents a

weighted average of the 95

th percentile Exchange client response time (in milliseconds) of the

various Exchange tasks. The read task is the highest weighted task — accounting for over half of

the score.

Many of the figures in this paper use the Score as a means of implying performance, i.e. a lower

Score indicates better Exchange Server performance.

Only you can determine the acceptable response time in your environment, but most

administrators opt for one of two criteria: sub-second response time, or sub-3-second response

time. Three seconds has been assumed as a safe upper limit for most graphs in this paper.

Calculating theLoadSim Score

The Score you see in the graphs of this paper are derived using the following process.

1. A LoadSim client simulates 100Mediumusers

2. LoadSim is configured to log data to disk.

3. All Loadsim runs are for at least four hours.

4. The 95th percentile LoadSim Score is then calculated from theLoadSim logs using the

LSLOG utility. (Refer to the Microsoft white paper, “LoadSim: Microsoft Exchange Server

Load Simulation Tool for Microsoft Exchange 4.0” for more information on LSLOG)

5. When running LSLOG, the first hour is thrown away, and only the second, third, and fourth

hours are used for calculating the Score.

6. The Scores returned by LSLOG for all theLoadSim clients in the test are averaged. The

mean Score is used as a data point on the graph.

Performance Monitor

The main tool used in monitoring and collecting the performance data contained in this paper is

the Windows NT Performance Monitor (PerfMon).

PerfMon monitors performance objects and counters within Windows NT, and it is these objects

and counter which depict how the Exchange Server machine is performing under load.

For more information on how to usePerfMon, refer to the Windows NT Resource Kit for

Windows NT 3.51, Volume 4, ‘Optimizing Windows NT’. Contained in the volume is a thorough

treatment ofPerfMon and some good suggestions for detecting bottlenecks. The principles

outlined are relevant to monitoring performance of Exchange Server.

Configuration of Test Facility

The test facility is configured on two isolated 10BaseTethernet networks - one network for the

LoadSim clients and one network for the data collection. This is to isolate the network traffic

imposed by data collection from the actual test network traffic. Figure1is a representation of the

network topology.

There are 15 LoadSim client machines. As stated earlier, aLoadSim client is simply a Windows

NT machine that is configured with the Microsoft Exchange client software andLoadSim. A

single LoadSim client can simulate multiple users. In this case, each of the 15LoadSim clients

simulate 100 users. The load imposed by each user is based on the profile outlined previously in

Table 2.

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Figure1. Exchange Server test network topology.

LOADSIM CLIENT HARDWARE CONFIGURATIONS

Machine Class Compaq ProLiant 2000

System Processor Single Pentium/100

System Memory 64 Mbytes

Disk subsystem 1GB Fast SCSI-2

Network Interface Compaq NetFlex/2 (10BaseT)

Operating System Windows NT Workstation v3.51 + SP2

Table 3.LoadSim client hardware configurations

PERFORMANCE RESULTS

Introduction

In this section of the paper the focus will be on the actual performance results of Microsoft

Exchange Server.

There are three main areas of server resources to warrant attention:

• Processor subsystem - all the server’s CPU resource, whether auniprocessor system or a

multiprocessor system

• Disk subsystem - all the server’s disk storage resource, including controller type and number

of drives in a RAID set

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• System memory - all the server’s memory resource, but not including cache memory on

processor boards or drive arrays. This is the amount of RAM installed in the system.

The data shows that Exchange Server is primarily processor intensive. That is to say, the first

resource to be consumed in an Exchange Server machine is the processor. With that in mind,

most of the following data will be centered around an analysis of performance with varying CPU

configurations.

After the processor subsystem, it is a tossup between the disk subsystem and system memory as to

which is more crucial. It’s a bit of a balance, i.e. if the server has a high performance disk

subsystem, then the system memory is more likely to reach capacity first. Conversely, if the

system has lots of memory, then the disk subsystem is likely to reach capacity first.

The cardinal rule to remember is this:if a subsystem is not a bottleneck, then adding more of that

resource will not help the problem. In all likelihood, it will merely amplify the existing weakness

in the system. For example, if an Exchange Server exhibits poor response time - and the processor

subsystem is not a bottleneck - then adding more processors to the server will not improve

response time.

Following the processor subsystem section are some data pertaining to the disk subsystem and

system memory. While there’s enough variables in those to warrant a white paper of their own,

these sections are included to provide a feel for how the Exchange Server system responds as

different resources are adjusted.

Processor Subsystem

As mentioned above, the processor subsystem is usually the first to be exhausted in an Exchange

Server system. Following are graphs showing how the different processor and server products

from Compaq affect the performance of Microsoft Exchange Server.

The value on the vertical axis is theLoadSim Score. The value on the horizontal axis is the

number ofLoadSim users.

1P indicates one processor installed in the server, 2P indicates two processors, etc. Each section

will describe the individual configuration of the Exchange Server computer being tested.

In all these test, the Exchange Server computer is configured as shown, and Exchange Optimizer

is run to set the Exchange system parameters. No manual tuning was done.

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