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PART VI
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Part VI:
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E-mail Continuity
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configuration files are available in 11 languages as of Exchange 2007 Service Pack 1 It represents the knowledge base of tests and checks that ExBPA runs during a scan Both ExBPA and its configuration files may be updated through Microsoft update, with Roll Up updates, or with Exchange Service Pack application Starting the ExBPA returns the welcome screen shown in Figure 21-4 and then offers an opportunity to enter an account with access to Active Directory after checking for updates The minimum permissions required for the account executing ExBPA are threefold: domain administrator for AD queries, local administrator on each Exchange server, and Exchange View-Only Permissions on the Exchange organization If the account running ExBPA has these permissions, the account option to access AD is not necessary After connecting to Active Directory, ExBPA presents options for the type of scan to execute, which are listed as Health Check, Permissions Check, Connectivity Test, Baseline, and Exchange 2007 Readiness Check These are shown in Figure 21-5 ExBPA runs these scans and returns a report of its findings relative to Exchange best practices From a troubleshooting perspective, ExBPA does highlight problems and brings them to the
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FIGURE 21-4 The Welcome screen for the Exchange Best Practices Analyzer
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Tr o u b l e s h o o t i n g E x c h a n g e 2 0 0 7
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FIGURE 21-5 Starting a New Best Practices scan in the ExBPA
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attention of the administrators in the reports Figure 21-6 shows a detailed scan report as an example Also, scans can be saved and compared against a baseline scan for differences Figure 21-7 shows several scan reports saved for future viewing These can be referenced any time you might need to see what has changed since the scan was last executed ExBPA is an invaluable tool for both proactive assessment and troubleshooting ExBPA also has a command-line version called ExBPACmdexe This is useful for scheduling scans and running them silently ExBPACmdexe has the same configurable components as the GUI version, including the scope of the scan, the scan type, and the configuration file to use
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Part VI:
E-mail Continuity
FIGURE 21-6
A Detailed View scan report
Queue Viewer
The Queue Viewer is accessed through the EMC and lists SMTP messages, inbound or outbound, that have not completed their journey These may be delayed deliveries because the destination server is offline, DNS resolution is failing, or disruptions have occurred between Hub Transport servers, as well as many other issues The Queue Viewer will identify all messages specific to a domain and can show the status of each message in the queue Queue contents are filterable where specific message types can be presented in the window based on dates, message IDs, addresses, and SCL values Figure 21-8 shows a simple example where messages are not making it to the smarthost
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Tr o u b l e s h o o t i n g E x c h a n g e 2 0 0 7
FIGURE 21-7
Stored scans to view on demand
The Queue Viewer does enjoy a new architecture in Exchange 2007, maintaining its own Extensible Storage Engine (ESE) database under %programfiles%\Microsoft\Exchange Server\TransportRoles\Data\Queue\ As you can see in Figure 21-9, the database and transaction logs coexist in the same folder and therefore on the same physical drive While troubleshooting message flow, it is conceivable that on busy servers the STMP queue itself can be a bottleneck If there is insufficient drive space, a minimum of 4GB of free space, or the server is exceptionally busy, then the SMTP queues can slow e-mail traffic This back pressure algorithm changes in Service Pack 1, allowing the minimum free drive space to go down to 500MB The location of the Queue database and its transaction logs are controlled through a configuration file Oddly, the file is called EdgeTransportexeconfig and is located in %programfiles%\Microsoft\Exchange Server\bin\ This is the configuration file for the Edge Transport role or the Hub Transport role queues, depending on which is installed on the Exchange Server
PART VI
SP 1 Exchange 2007 SP1 improves the back pressure algorithm This allows for a reduction in the
minimum free drive space on an Exchange 2007 Hub Transport server from 4GB to 500MB
Part VI:
E-mail Continuity
FIGURE 21-8 The Queue Viewer
After the following tags have been edited in the configuration file, the MSExchangeTransport service needs to be restarted for the change to take effect:
<add key="QueueDatabasePath" value = "<full path>" /> <add key="QueueDatabaseLoggingPath" value = "<full path>" />
On a busy Hub Transport server, especially one that shares drives with the Mailbox role, it may be beneficial to isolate the SMTP Queue database on a separate spindle As we expect, the SMTP queues in Exchange 2007 can also be managed using the EMS The cmdlet Get-Queue returns the equivalent output, shown in Figure 21-10, as the Queue Viewer does in Figure 21-8 Other cmdlets that can manipulate the SMTP queues include Suspend-Queue, Resume-Queue, and Retry-Queue Should your system be suspected of sending lots of messages as a result of some virus or bot infection, running Suspend-Queue to stop message flow will help with troubleshooting
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