Question

What is disk multipathing?

Answer

Disk multipathing uses a software module to select a disk path after I/O data is saved in the cache and before the data is written to a disk. The process is as follows:

1. The local controller checks whether the local disk path is normal. If it is normal, the local controller writes data to the local disk.
2. If the local disk path fails or other errors occur, the local controller forwards I/O requests to the peer controller, and the peer DMP module then writes the data to the peer disk through the peer disk path.