When you start Backup Server, use the -P flag to configure the Open Server for the maximum number of threads it will create. The maximum number of threads equals the maximum number of stripes available. If you have started Backup Server without setting a high enough -P value and you attempt to dump or load a database to a number of stripes that exceeds the number of threads, the dump or load operation will fail.
You must configure the local and remote Backup Servers at startup by providing the appropriate values to the command line options. A remote dump to greater than 25 stripes with the local and remote Backup Servers started with default configuration will fail because the maximum number of network connections that Backup Server can originate (specified by the -N option) is by default 25. The maximum number of server connections into the remote Backup Server (specified by the -C option) is 30.