US 2024/0256181 A1 · COMMAND TAGS

Abstract

Embodiments of using command tags are described to prevent data corruption in a multi-path network in an NVMe over Fabrics (NVMe-OF) environment. A command tag is incorporated in a written command send from a host for command identification. Once the host detects an issue of a first link between the host and namespace, the host may immediately send, using a second link, a retry of a command that was previously sent by the host to a first controller via the first link. The retry of the command comprises the same command tag which allows the first and second controllers to detect an execution condition of the first write command, and thus avoiding repeat execution of the first write command by the first controller and the second controller. Therefore, data corruption may be addressed efficiently to the root cause.

Claims20

Dependent claims

A computer-implemented method for handling data in a multi-path non-volatile memory express (NVMe) over Fabrics (NVMe-oF) environment, the computer-implemented method comprising:

responsive to receive at a controller a write command with a retry flag set:
determining, based upon a command tag in the write command, whether the write command has been previously processed at the controller;
and
responsive to the write command not having been previously processed at the controller:
checking with one or more other controllers that may have received a prior write command comprising the command tag whether they have processed the prior write command;
and
responsive to the prior write command not having been processed by any of the one or more other controllers:
executing, at the controller, the write command;
updating a list of command tags that have been processed by the controller with an addition of the command tag in the write command;
and
sending, from the controller to a host, a response indicating that the write command has been successfully completed.

8 more elements

Dependencies are inferred from the claim text.

Command tags

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Command tags

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Abstract

Claims20