After completing an upgrade of Archive Manager from a version earlier than 4.6.x to 4.8 you see multiple instances of the RemotingHost32.exe process appear on the Archive Manager server and the CPU will begin to run at 100% for a long period of time.
The RemotingHost32.exe process is used by the Full Text Indexing service to index the Archive Manager data store and it is normal for between 5-10 instances of this process to be launched however the server will receive an increase in server load just after completion of the upgrade due to the Index split operation.
If a very large number (>20) are appearing then this is an environmental issue with the server.
If an upgrade is being completed from an earlier version than 4.6 then the index will conduct a split operation that will take a very long time to complete depending on the size of the datastore. During this process the Archive Manager server will encounter a very high processing load however if a large number (>20) appear of RemotingHost32.exe and "Memory Read errors" occur then please consider the following:
1) Does the local system partition on the hard drive have plenty of disk space?
During the indexing process, if low memory is available then the server is likely to begin using the pagefile extensively. If the local drive where this pagefile exists is low on space then I/O on the disk and CPU will be elevated that may generate "Memory Read Errors" and will bring the performance of the server down considerably. Please check to ensure there is plenty of disk space available and if possible, move the pagefile to another drive. Many more RemotingHost32.exe processes will continue to be launched if memory read errors occur as the tool will continue to attempt to index the entire data store and if some processes hang or become unresponsive then more processes will be generated.
2) Please review the local settings\temp directory for the Archive Manager Service account that is running the Full Text Index service.
This temporary folder will contain a lot of temporary information that the service account has used in the past however the upgrade process does not remove this information. Please empty this folder to improve performance for the service account. When the FTI service is resumed you will see content go into and be removed from this folder constantly which is normal operation.
3) Please review the FTI log file for errors. If you receive many errors relating to the iFilters then please ensure you are using the latest versions of the Microsoft and Adobe iFilters that the tool will use to index the content.
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