Io request processing method, apparatus and system for multi-path storage and storage medium

An IO request processing method for multi-path storage, which is applied to a host, wherein the host is connected to a storage system, and the storage system comprises a plurality of storage nodes, the method comprises:

• determining a plurality of path devices corresponding to a target volume in the storage system, wherein the target volume is divided into a plurality of segments and stored on the plurality of storage nodes, and the plurality of storage nodes respectively correspond to the plurality of path devices;
• detecting respective efficiency of processing requests of the plurality of the path devices;
• generating path switching information for path devices based on a detection result, wherein the path switching information is used to indicate switching of the path devices that process an IO request of the segments;
• sending the IO request for the segments to switched path devices based on the path switching information, and/or sending the IO request for the segments to the path device corresponding to an optimal storage node based on mapping relationship sent by the storage system;
• wherein the optimal storage node is the storage node corresponding to the segment in the mapping relationship.

A processing system comprising a storage system and a host, wherein:

• the storage system is configured to execute an IO request processing method for multi-path storage, which is applied to the storage system, wherein the storage system is connected to the host in communication, and the storage system comprises a plurality of storage nodes, the method comprises:
• dividing a target volume to obtain a plurality of segments;
• wherein the target volume is mapped with a plurality of path devices on the host, and the plurality of path devices correspond to a plurality of storage nodes respectively;
• determining a mapping relationship between the plurality of segments and the plurality of storage nodes;
• wherein the mapping relationship is used to identify an optimal storage node mapped by the segment in the plurality of storage nodes;
• detecting states of the plurality of storage nodes;
• adjusting the mapping relationship based on respective detected state parameters of the plurality of storage nodes and/or path switching information sent by the host;
• wherein, the path switching information is used to indicate switching of the path devices that process the IO request of the segments;
• sending the adjusted mapping relationship to the host, so that the host sends the IO request for the segment to the path device corresponding to the optimal storage node based on the adjusted mapping relationship;
• the host is configured to execute an IO request processing method for multi-path storage, which is applied to the host, wherein the host is connected to the storage system, and the storage system comprises a plurality of storage nodes, the method comprises:
• determining a plurality of path devices corresponding to a target volume in the storage system, wherein the target volume is divided into a plurality of segments and stored on the plurality of storage nodes, and the plurality of storage nodes respectively correspond to the plurality of path devices;
• detecting respective efficiency of processing requests of the plurality of the path devices;
• generating path switching information for path devices based on a detection result, wherein the path switching information is used to indicate switching of the path devices that process an IO request of the segments;
• sending the IO request for the segments to switched path devices based on the path switching information, and/or sending the IO request for the segments to the path device corresponding to an optimal storage node based on mapping relationship sent by the storage system;
• wherein the optimal storage node is the storage node corresponding to the segment in the mapping relationship.