Non-disruptive migration of a virtual volume in a clustered data storage system

A non-transitory computer readable medium for migrating a virtual volume between different storage appliances, the non-transitory medium having a set of instructions stored thereon, the set of instructions, when executed on processing circuitry, cause the processing circuitry to perform the steps of:

• initially providing a virtual volume to at least one host computer from a first storage appliance within a cluster of storage appliances, including providing the host computer with access to the virtual volume over a data path between the host computer and a protocol endpoint hosted on the first storage appliance in response to an initial binding between the virtual volume and the protocol endpoint hosted on the first storage appliance;
• and
• migrating the virtual volume from the first storage appliance within the cluster to a second storage appliance within the cluster at least in part by:
• conveying a rebind request from a management interface within the cluster to the host computer over a control path between the management interface within the cluster and the host computer, wherein the control path between the management interface within the cluster and the host computer is different from both i) the data path between the host computer and the protocol endpoint hosted on the first storage appliance, and ii) a data path between the host computer and a protocol endpoint hosted on the second storage appliance, wherein the rebind request indicates to the host computer that the host computer should issue a bind request for the virtual volume from the host computer to the cluster, and wherein the conveying includes the management interface placing the rebind request on an event queue within the management interface that is periodically polled by the host computer, and
• in response to receipt of a bind request for the virtual volume from the host computer, creating a new binding between the virtual volume and the protocol endpoint hosted on the second storage appliance.

A system for migrating a virtual volume between different storage appliances, the system comprising:

• processing circuitry;
• memory having program code stored thereon that is executable on the processing circuitry, wherein the program code, when executed on the processing circuitry, causes the processing circuitry to:
• initially provide a virtual volume to at least one host computer from a first storage appliance within a cluster of storage appliances, including providing the host computer with access to the virtual volume over a data path between the host computer and a protocol endpoint hosted on the first storage appliance in response to an initial binding between the virtual volume and the protocol endpoint hosted on the first storage appliance;
• and
• migrate the virtual volume from the first storage appliance within the cluster to a second storage appliance within the cluster at least in part by causing the processing circuitry to:
• convey a rebind request from a management interface within the cluster to the host computer over a control path between the management interface within the cluster and the host computer, wherein the control path between the management interface within the cluster and the host computer is different from both i) the data path between the host computer and the protocol endpoint hosted on the first storage appliance, and ii) a data path between the host computer and a protocol endpoint hosted on the second storage appliance, wherein the rebind request indicates to the host computer that the host computer should issue a bind request for the virtual volume from the host computer to the cluster, and wherein the conveying includes the management interface placing the rebind request on an event queue within the management interface that is periodically polled by the host computer, and
• in response to receipt of a bind request for the virtual volume from the host computer, create a new binding between the virtual volume and the protocol endpoint hosted on the second storage appliance.