we use Microsoft Exchange Load Generator 2010 to perform stress testing, the server is exchange 2010 sp1. we change xml configuration to simulate customer's situation, such as send 50,recieve 50, mail size :500k, and we want test peak time ,we use 2000 users, 2hour parameter, and enable stress mode we find there are many mail in queue, and has error "432 4.3.2 STOREDRV.Deliver; recipient thread limit exceeded ", so we search the error, find it is store driver throttling designed by exchange 2010 sp1, but we worried the stress test can not reach goal because this question because cpu and network resource are very low. so how can we do the stress testing

That would tell me that your server can't handle the stress.Ed Crowley MVP "There are seldom good technological solutions to behavioral problems."

Hi, The error “432 4.3.2 STOREDRV.Deliver; recipient thread limit exceeded” may because your Exchange Server cannot handle the stress, Exchange Server mail flow is too heavy. You can get more information from this document: Store Driver Fault Isolation Improvements in Exchange 2010 SP1 http://blogs.technet.com/b/exchange/archive/2011/04/11/store-driver-fault-isolation-improvements-in-exchange-2010-sp1.aspx Thanks, Evan Liu TechNet Subscriber Support in forum If you have any feedback on our support, please contact tngfb@microsoft.com Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.