What's the meaning of this message, sys_oplock_break timeout ?
This message indicates that a single user had an opportunistic lock on a file and a second user needed access to the file. When the SnapOS contacted the owner of the opportunistic lock, it was unable to communicate with the owner. This is a normal message and does NOT indicate a failure.
Also, certain DataBase applications require that Opportunistic Locking be disabled. You may disable this feature on the Snap Server on the Network Settings > Microsoft Networking > Advanced screen of the browser-based Administration Tool.