I am using exchange 2010 with sp3 on a single server with transport/client access/ mailbox roles on it. The server is running on windows 2012 /32G memory / 2 socket 16 core processor. The current mailbox database size is 900GB ( single database)
Question is: when i am running the windows backup(wbadmin), the message queued for delivery shoots up and some email delays are up to 30 mins. this is consistent every time i'm doing a windows backup. can you help me pinpoint the cause of email delays during this time?