RE: Exchange 5.5 Connectors
From: Amit Mantri [MSFT] (amantri_at_online.microsoft.com)
Date: 05/19/04
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Date: Wed, 19 May 2004 19:22:19 GMT
Hi ,
This is is what I can share with you.Refer the kbarticle.
http://support.microsoft.com/default.aspx?scid=kb;en-us;243632&Product=ech
XCON: Maximum Number of X.400 Connectors That Can Be Installed on One
Exchange Server Computer
View products that this article applies to.
This article was previously published under Q243632
IMPORTANT: This article contains information about modifying the registry.
Before you modify the registry, make sure to back it up and make sure that
you understand how to restore the registry if a problem occurs. For
information about how to back up, restore, and edit the registry, click the
following article number to view the article in the Microsoft Knowledge
Base:
256986 Description of the Microsoft Windows Registry
SUMMARY
The maximum number of X.400 Connectors that can be installed on a single
Exchange Server computer varies depending on practical limits for each
server, such as hardware, network bandwidth, and so on. This article offers
some suggestions for installing a large number of X.400 Connectors on a
bridgehead server.
MORE INFORMATION
WARNING: If you use Registry Editor incorrectly, you may cause serious
problems that may require you to reinstall your operating system. Microsoft
cannot guarantee that you can solve problems that result from using
Registry Editor incorrectly. Use Registry Editor at your own risk.
Be sure to use Exchange Server version 5.5 and the latest service pack.
There are some significant message transfer agent (MTA) performance and
diagnostics enhancements in Exchange Server 5.5, and each service pack
improves upon these.
Set the TCP/IP control blocks value according to the number of X.400
Connectors installed on the server. You may need to manually adjust this
value if more than two X.400 Connectors are installed on an Exchange Server
computer. It is found at the following registry location:
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\MSExchangeMTA\Parameter
s\TCP/IP control blocks
By default, this value is set to 20 (decimal). However, if there are more
than two X.400 Connectors on the server, allocate enough control blocks (10
X the number of X.400 connectors) to allow for the maximum number of
associations over each connector (this maximum number is 10, 9 associations
for low and normal priority mail and 1 association is reserved for urgent
priority mail).
The actual maximum entry in the registry for is 1,250 decimal, but this is
taken from a pool of control blocks for the TCP/IP, TP4, and X.25 transport
stacks. These registry values correspond to TCP/IP control blocks, TP4
control blocks, and Eicon X.25 connections, respectively. By default, all
of these values are set to 20 decimal, so the TCP/IP control blocks value
can be increased up to 1,210 decimal without a problem. This permits a
maximum of 121 X.400 Connectors on a single server, each using the maximum
number of allowable associations. This number is only the theoretical
value. The capacities of the bridgehead server may limit the actual number
of X.400 Connectors to a value less than this.
It is unlikely that each X.400 Connector would process enough mail to
require the maximum number of associations for each connector. Furthermore,
if the X.25 transport stack is not in use, this value can be reduced to a
value of zero, thus increasing the available control blocks for the TP4 or
TCP/IP stack by 20. TP4 control blocks can be set below the default value
of 20, however, doing so does not allocate any more control blocks for
TCP/IP.
If you set the maximum number of (pooled) control blocks allowed too high,
you will get the following error message:
Could not start the Microsoft Message Transfer Agent service on
<servername>. Error 2140: an internal Windows NT error occurred.
You will also see event ID 4300 in the application log:
Event ID: 4300
Source: MSExchangeMTA
Type: ERROR
Category: Configuration
Unable to initialize due to a bad configuration. Contact Microsoft
Technical Support. Error code=<variable> [1 POP4 MAIN BASE 1] (16)
For example, using the above guidelines, if you have 30 X.400 Connectors
installed and functioning on an Exchange Server computer, set TCP/IP
control blocks to 300 decimal for maximum performance. If this setting is
too low for the number of X.400 Connectors installed on the server (for
example, 70 decimal), and all the associations are in use, event ID 9156
may appear in the application event log:
Event ID: 9156
Source: MSExchangeMTA
Type: Warning
Category: Resource
Description: A resource limit has been reached while attempting to open an
association. There are no free control blocks available for network type 1.
The configured count is 70. [BASE IL MAIN BASE 1 282] (10)
Consider splitting a large number of X.400 Connectors across several
servers (30-50 for each server) to reduce the impact of a
single-point-of-failure caused by either network or hardware issues.
Performance Monitor logs help gauge how the server is performing as more
connectors are added. It is a good idea to have a baseline of normal usage
for the processor, disk, page file, and so on to judge how many connectors
a server can handle.
234280 XCON: How to Increase the Ability of the MTA to Pass Mail over Slow
Network Connections
For proactive as well as reactive MTA troubleshooting and monitoring, see
the "MTA Troubleshooting Guide" on TechNet or at the following Web site:
http://technet.microsoft.com
This posting is provided "AS IS" with no warranties, and confers no rights.
Regards,
Amit Mantri
- Next message: Colby Holland [MSFT]: "Re: exchange server 2003 instalation problem(setup stop at config for registry of Miscellaneous Atom)."
- Previous message: AIME: "Re: POP3 configuration"
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