On 4/24/19 10:31, likun wrote: > Hello, Stephen, thank you for input. > > Yes, these servers have the same firewall rules, and both of them have the same problem from time to time, most of time they are good. > > Actually, these servers are newly installed to be used as the Glusterfs storage server, so not much data flowing at this time. As a WAG - have you double checked to make sure there aren't any IP addressing conflicts in play?