Data Access Method, Apparatus, and System

Abstract

A first storage node communicates with at least one second storage node. A physical disk included in the at least one second storage node is mapped as a virtual disk of the first storage node. The method may include: receiving a first write request, where the first write request carries first to-be-written data; striping the first to-be-written data to obtain striped data, and writing the striped data to a physical disk and/or the virtual disk of the first storage node; and recording a write location of the striped data. For example, the technical solution may be applied to a storage system that includes an NVMe SSD.

1 . A method implemented by a computer, wherein the method comprises:
 virtualizing a virtual non-volatile memory (NVM) Express (NVMe) solid-state drive (SSD) from a physical NVMe SSD of a storage node that is connected to the computer through an NVMe over Fabrics protocol, wherein the virtual NVMe SSD is in the computer as a local NVMe SSD;   receiving a first accessing request; and   accessing, based on the first accessing request, the virtual NVMe SSD by accessing the physical NVMe SSD.   
     
     
         2 . The method of  claim 1 , wherein the computer is another storage node, a server, or a network device. 
     
     
         3 . The method of  claim 1 , wherein the first accessing request includes to-be-written data, and wherein the method further comprises performing an erasure coding (EC) operation or a redundant arrays of independent disks (RAID) operation to the to-be-written data. 
     
     
         4 . The method of  claim 3 , wherein performing the EC operation or the RAID operation comprises:
 striping the to-be-written data to obtain striped data, wherein the striped data comprises first striped data; and   writing the first striped data to the virtual NVMe SSD by writing the first striped data to the physical NVMe SSD.   
     
     
         5 . The method of  claim 1 , wherein accessing the physical NVMe SSD comprises accessing the physical NVMe SSD by a remote direct memory access (RDMA) command. 
     
     
         6 . The method of  claim 1 , wherein receiving the first accessing request comprises receiving the first accessing request from a Peripheral Component Interconnect Express (PCIe) bus. 
     
     
         7 . The method of  claim 4 , further comprising recording a fingerprint of the to-be-written. 
     
     
         8 . The method of  claim 4 , further comprising recording a stored location of the first striped data. 
     
     
         9 . A computer comprising:
 a memory configured to store instructions; and   a processor coupled to the memory and configured to execute the instructions to cause the computer to:
 virtualize a virtual non-volatile memory (NVM) Express (NVMe) solid-state drive (SSD) from a physical NVMe SSD of a storage node that is connected to the computer through an NVMe over Fabrics protocol, wherein the virtual NVMe SSD is in the computer as a local NVMe SSD; 
 receive a first accessing request; and 
 access, based on the first accessing request, the virtual NVMe SSD by accessing the physical NVMe SSD. 
   
     
     
         10 . The computer of  claim 9 , wherein the computer is another storage node, a server, or a network device. 
     
     
         11 . The computer of  claim 9 , wherein the first accessing request includes to-be-written data, and wherein the processor is configured to execute the instructions to further cause the computer to perform an erasure coding (EC) operation or a redundant arrays of independent disks (RAID) operation to the to-be-written data. 
     
     
         12 . The computer of  claim 11 , wherein the processor is configured to execute the instructions to further cause the computer to:
 strip the to-be-written data to obtain striped data, wherein the striped data comprises first striped data; and   write the first striped data to the virtual NVMe SSD by writing the first striped data to the physical NVMe SSD.   
     
     
         13 . The computer of  claim 9 , wherein the processor is configured to execute the instructions to further cause the computer to access the physical NVMe SSD by a remote direct memory access (RDMA) command. 
     
     
         14 . The computer of  claim 9 , wherein the processor is configured to execute the instructions to further cause the computer to receive the first accessing request from a Peripheral Component Interconnect Express (PCIe) bus. 
     
     
         15 . A computer program product, comprising computer executable instructions stored on a non-transitory computer-readable medium that, when executed by a processor, cause a computer to:
 virtualize a virtual non-volatile memory (NVM) Express (NVMe) solid-state drive (SSD) from a physical NVMe SSD of a storage node that is connected to the computer through an NVMe over Fabrics protocol, wherein the virtual NVMe SSD is in the computer as a local NVMe SSD;   receive a first accessing request; and   access, based on the first accessing request, the virtual NVMe SSD by accessing the physical NVMe SSD.   
     
     
         16 . The computer program product of  claim 15 , wherein the computer is another storage node, a server, or a network device. 
     
     
         17 . The computer program product of  claim 15 , wherein the first accessing request includes to-be-written data, and wherein the computer-executable instructions, when executed by the processor, case the computer to perform an erasure coding (EC) operation or a redundant arrays of independent disks (RAID) operation to the to-be-written data. 
     
     
         18 . The computer program product of  claim 17 , wherein the computer-executable instructions, when executed by the processor, cause the computer to:
 stripe the to-be-written data to obtain striped data, wherein the striped data comprise first striped data; and   write the first striped data to the virtual NVMe SSD by writing the first striped data to the physical NVMe SSD.   
     
     
         19 . The computer program product of  claim 15 , wherein the computer-executable instructions, executed by the processor, cause the computer to access the physical NVMe SSD by a remote direct memory access (RDMA) command. 
     
     
         20 . The computer program product of  claim 15 , wherein the computer-executable instructions, when executed by the processor, cause the computer to receive the first accessing request from a Peripheral Component Interconnect Express (PCIe) bus.