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Chapter 2: Capacity and Availability Management 25

your server becomes low on kernel memory, your system becomes unresponsive. To regain control of your server, you must restart it to free up the kernel memory.

Table 2.1 shows the registry parameters you might need to alter if you are to make perfor- mance gains on servers with more than 1 GB RAM.

Table 2.1 Registry Parameters to Alter for Large Servers

Location	Parameter	Default	When to	Recommended
		Setting	Change	Setting
HKEY_LOCAL	MsgHandle	Not present,	To gain	Enough to
_MACHINE\System	Threshold	but defaults	additional	accomodate
\CurrentControlSet	(REG_DWORD)	to 0x3e8	performance	the total
\Services\SMTPSVC			when message	number of
\Queuing			queues are	messages in
			consistently	the queues at
			greater than	any one time.
			1,000	You should not
				raise the value
				to greater than
				15,000
				decimal

HKEY_LOCAL	MsgHandle	Not present,	To gain	Set to the
_MACHINE\System	AsyncThreshold	but defaults	additional	same
\CurrentControlSet	(REG_DWORD)	to 0x3e8	performance	value as
\Services\SMTPSVC			when message	“MsgHandle
\Queuing			queues are	Threshold”
			consistently
			greater than
			1,000

HKEY_LOCAL	FileCache	Not present,	If the	0x258 (600)
_MACHINE\System	MaxHandles	but defaults	“MsgHandle
\CurrentControlSet	(REG_DWORD)	to 0x320	Threshold”
\Services\Inetinfo			registry
]Parameters			parameter
			value is
			increased
			from defaults

MaxMessageObjects is a registry parameter that correlates to the number of messages that can be queued up at a given time by SMTP. Each e-mail message resident in the SMTP queue uses at least 4 KB of memory; therefore, it is possible to run into a low memory situation with a very large queue. Setting MaxMessageObjects lower reduces the maxi- mum number of messages that can reside in the queue, thus decreasing the maximum memory footprint for SMTP. After this limit is reached, each SMTP connection made to the server will return with an out-of-memory error. For example, if MaxMessageObjects is

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Contents

Version Exchange 2000 Operations Guide Isbn Contents Enterprise Monitoring Change and Configuration Management Protection SupportGlossary Page Key Authors Content LeadReviewers ViiPage Microsoft Operations Framework MOF Introduction SLA Efficiency, Continuity, and Security How to Use This Guide Efficiency Continuity Capacity and Availability Management Chapter Outlines Protection Planning and Deployment Features Service Level Agreements Performance Recovery Related Topics SummaryPage Capacity and Availability Management Chapter Sections Capacity Management Capacity and Availability Management Microsoft Exchange 2000 Operations Version Availability Management Service Hours Minimizing System Failures Service Availability Decreasing Single Points of Failure Increasing the Reliability of Exchange Minimizing System Recovery Time Performance Tuning Making Changes to the Registry No Performance Optimizer Optimizable Features Tuning Considerations Tuning the Message Transfer Agent MTAUpgrading from Exchange 5.5 to Exchange Mailroot Directory Location Tuning Smtp Transport Smtp File Handles Hkeylocal Store and ESE Tuning Online Store MaintenanceActive Directory Checking Message Deletion and Online Defragmentation Online Backups First Storage Group Choosing the Correct Maintenance Strategy Store-Database Cache Size Extensible Storage Engine ESE Heaps Microsoft Exchange 2000 Operations Version Log Buffers Tuning Active Directory Integration Type SET Maxactivequeries to 40 and press Enter Tuning Outlook Web Access OWA Setting OWA Properties Hardware Upgrades Page Change and Configuration Management Change Management PrerequisitesDefining Change Type Request for Change Is Submitted to Change Manager Change Is Passed to IT Executive Committee for Approval Change Manager Assesses the RFC Change Process Evaluation Change Is Passed to the Change Owner Scripting Minor and Standard Changes Minor and Standard Changes Security Software Control and DistributionDocumentation Configuration Management Tools for Configuration Management Configuration Management and Change ManagementConfiguration Items Microsoft Exchange 2000 Operations Guide Version Hardware Server Printer Software Exchange Hotfix Configuration Management Relationships Nine Configuration Items with Relationships Between Them Maintaining the Configuration Management Database Defining Configuration ItemsConfiguration Management and Exchange Ownership Change Management Administering System Policies BackupExchange System Policies Security Summary Enterprise Monitoring System Monitor Performance Monitoring Exipc Exchange 2000 Objects and Counters to Monitor Smtp Service or Resource Performance Object Smtp Server Information Store CountersMSExchangeIS MSExchangeIS Mailbox and MSExchangeIS Public MSExchangeMTA and MSExchangeMTAConnections Windows 2000 Objects and Counters to Monitor MSExchangeIM Virtual ServersMSExchangeAL Subsystem Object Counter Exchange Comments Subsystem Object Counter Exchange Comments Centralized Monitoring Event Viewer Event Monitoring Centralized Event Monitoring Log Files Adding Services to the Default Configuration Availability MonitoringMonitoring and Status Tool Notifications Monitoring Resources Centralized Availability Monitoring StatusDisabling Server Monitoring Client Monitoring Summary Page Chapter End Point Chapter Start Point Protection Against Hacking Firewall Operations Maintaining Firewall Availability Anti-Virus Measures Source Destination Service Protocol and portMonitoring Against Hacker Intrusion Dealing With Security Breaches Staying Current Dealing With Virus Infection File Extensions and File Types Blocking Attachments at the Client File Extension File Type Backing Up Disaster Recovery Procedures Protection Disk Imaging Offline Backup Recovering Lost Mailboxes Recovering Individual MessagesRestoring To connect an Exchange 2000 mailbox to another user Recovering Exchange Stores and Storage Groups Recovering Exchange After Active Directory Failure Full Exchange Server Recovery Alternate Server Recovery Recovery Testing Summary Page Support Reducing End User Support Costs Providing Support for End Users Support Problem Reporting Notifying Users Dealing with User Problems Exchange Problem Management Support Summary Access Control List ACL Access Control Entry ACEActive Directory Connector ADC Active Directory Services Interfaces Adsi ActiveX Data Objects ADO Administration groupAdsi Edit Asymmetric Cipher Clear item CiphersCollaboration Data Objects CDO for Windows Collaboration Data Objects Configuration Connection Agreement ConfigCA Conferencing Management Service CMSConference Technology Provider CTP Connection Agreement CA Domain Name Services DNS Domain modeDomain tree DSAccess Domain controller Enterprise Exchange Conferencing Services ECSEncryption Epoxy Exipc formerly known as Epoxy Event ServiceExtensible Storage Engine ESE also known as JET Forest also known as enterprise Group Installable File System IFSHash Functions Instant Messaging IM Lightweight Directory Access Protocol Ldap Internet Messaging Access Protocol version 4 IMAP4Joint Engine Technology JET Link State Algorithm LSA Name Service Provider Interface Nspi Metabase update serviceMessaging Application Programming Interface Mapi Metabase Opaque item Outlook Web AccessPolicy Post Office Protocol version 3 POP3 Remote Procedure Calls RPC Recipient Update Service RUSResource Resource mailbox Routing service Routing Group Connector RGCRouting group Routing Engine Secure Hash Algorithm version SchemaSecurity principal Simple Message Transfer Protocol Smtp Site Consistency Checker SCC also known as the Skcc Site Replication Service SRSStorage group Store 120 System attendantUser User Principal Name UPN Web-DAV Web Storage System509