Computer system and storage access apparatus

A storage access apparatus, comprising:

• a processing unit;
• a first interface;
• and
• a second interface, wherein the storage access apparatus is coupled to a processor of a compute node by using the first interface, and the storage access apparatus is coupled to at least one network storage device via the second interface;
• at least one virtual machine (VM) runs on the compute node, and the at least one network storage device provides distributed storage resources for the at least one virtual machine,
• wherein the storage access apparatus comprises a direct access module to support single-root I/O virtualization (SR-IOV) and is configured to:
• perform virtualization to obtain at least one virtual function (VF) using a physical function PF of the SR-IOV function, and
• configure a VM-VF association relationship, so that a direct access path is established between a VM and a VF that are associated, wherein one VM corresponds to one VF, and
• wherein the storage access apparatus further comprises a resource scheduler to support a distributed storage resource scheduling function and is configured to:
• obtain, using the second interface, data block resources provided by the at least one network storage device that is coupled to the storage access apparatus,
• form a plurality of virtual volumes using the obtained data block resources, and
• configure a VF-virtual volume association relationship, wherein one VF corresponds to at least one virtual volume.

A method of storage accessing, comprising:

• receiving, by a storage access apparatus, an input/output (I/O) request from a first virtual machine (VM), wherein the storage access apparatus is one of n storage access apparatuses of a computer system, the computer system further including n computer nodes and m network storage devices, wherein at least one VM runs on each of the n computer nodes, wherein the m network storage devices provide distributed storage resources for the at least one VM, and wherein n and m are integers greater than or equal to 1;
• determining, by the storage access apparatus, a first virtual function (VF) associated with the first VM;
• placing, by the storage access apparatus, the I/O request into an I/O queue of the first VF;
• determining, by the storage access apparatus based on a virtual volume associated with the first VF, at least one data block that is in a network storage device and that corresponds to the I/O request;
• executing, by the storage access apparatus, a read or write operation on the at least one data block;
• and
• sending, by the storage access apparatus, a result of the I/O request to the first VM.