Data access method in a storage architecture

摘要

A method for generating a virtual volume (VV) in a storage system architecture. The architecture comprises a host and one or more disk array subsystems. Each subsystem comprises a storage controller. One or more of the subsystems comprises a physical storage device (PSD) array. The method comprises the following steps: mapping the PSD array into a plurality of media extents (MEs), each of the MEs comprises a plurality of sections; providing a virtual pool (VP) to implement a section cross-referencing function, wherein a section index (SI) of each of the sections contained in the VP is defined by the VP to cross-reference VP sections to physical ME locations; providing a conversion method or procedure or function for mapping VP capacity into to a VV; and presenting the VV to the host. A storage subsystem and a storage system architecture performing the method are also provided.

主权项

1. A method for accessing data in a storage system architecture, the storage system architecture comprising a host and a plurality of storage nodes, the method comprising:
checking whether or not a data location information of a to-be-issued IO access command is in a cache memory of the host, wherein the data location information comprises a first validity check information; sending, by the host, the IO access command to a target storage node of the storage nodes according to the data location information when the data location information is in the cache memory, wherein the IO access command comprises the first validity check information; checking, by the target storage node, the validity of the IO access command according to the first validity check information; and executing, by the target storage node, the IO access command when the IO access command is valid.