Multi-node storage system and queue control method of multi-node storage system

A queue control method of a multi-node storage system including a plurality of nodes providing a volume to a computer as a logical storage area, each node including a controller that processes an I/O request from the computer,

• the multi-node storage system including
• a plurality of NVMe drives PCI-connected to any one of the controllers of the node;
• and
• a switch that connects the controllers of the plurality of nodes to each other,
• wherein the controller includes a plurality of processors that process the I/O request from the computer and a memory, and
• the memory includes, for the plurality of NVMe drives,
• virtual queues which are equal in number to processors of a plurality of controllers constituting the multi-node storage system, and
• real queues that store a command in the plurality of NVMe drives and that are smaller in number than the virtual queues,
• the virtual queue including a VSQ that stores a command and a VCQ that stores a response,
• the real queue including a SQ that stores a command and a CQ that stores a response,
• the queue control method comprising:
• if a read request is received from the computer, storing, by a first processor of the plurality of processors, the read request in a first VSQ allocated to the first processor;
• reaping, by a representative processor accommodated in a first controller of the plurality of controllers which accommodates the first processor, the read request from the first VSQ, and storing the read request in a first SQ set in a first NVMe drive of the plurality of NVMe drives which stores target data of the read request;
• and
• reaping, by the first NVMe drive, the read request stored in the first SQ and executing the read request.

A queue control method of a multi-node storage system including a plurality of nodes providing a volume to a computer as a logical storage area, each node including a controller that processes an I/O request from the computer,

• the multi-node storage system including
• a plurality of NVMe drives PCI-connected to any one of the controllers of the node;
• and
• a switch that connects the controllers of the plurality of nodes to each other,
• wherein the controller includes a plurality of processors that process the I/O request from the computer and a memory, and
• the memory includes, for the plurality of NVMe drives,
• virtual queues which are equal in number to processors of a plurality of controllers constituting the multi-node storage system, and
• real queues that store a command in the plurality of NVMe drives and that are smaller in number than the virtual queues,
• the virtual queue including a VSQ that stores a command and a VCQ that stores a response,
• the real queue including a SQ that stores a command and a CQ that stores a response,
• the queue control method comprising:
• if the read request is received from the computer, calculating, by a first processor of the plurality of processors, an access destination NVMe drive from the read request if the read request is received from the computer;
• when the calculated NVMe drive is PCI-connected to a second controller other than the first controller accommodating the first processor,
• storing the read request in a second VSQ of the second controller allocated to the first processor;
• reaping, by a representative processor accommodated in the second controller, the read request from the second VSQ, and storing the read request in a second SQ set in a second NVMe drive of the plurality of NVMe drives storing target data of the read request;
• and
• reaping, by the second NVMe drive, the read request stored in the second SQ and executing the read request.