Choose the optimal path
- In order to ensure the stability and continuity of business operations, the storage system generally configures two or more controls.Implement component redundancy. Each LUN in the storage system has a one-to-one corresponding home controller. The home controller is a specific controller specified by the storage system for the LUN to prevent two or more controllers from operating on the same LUN at the same time. data. During the daily operation, if the application server accesses the LUN through the non-home controller, it needs to be transferred to the home controller of the LUN for processing. Therefore, the fastest I/O rate can be obtained by directly accessing the corresponding LUN through the home controller.
- In a multi-path networking environment, the home controller of the LUN on the storage system corresponding to the virtual LUN on the application server is called the preferred controller of the LUN. Therefore, the application server on which the UltraPath is installed preferentially selects the LUN on the storage system through the preferred controller (home controller) to obtain the fastest I/O rate. Therefore, the path to the preferred controller is the optimal path.
- UltraPath can obtain the preferred controller information of the LUN, so it can automatically select one or more paths on the preferred controller for the data stream to obtain the optimal I/O rate.
As shown in the following figure, the networking of the LUN is A control, that is, the A control is the preferred controller. UltraPath prefers the path on the A control as the preferred path.
