INTERCONNECT PATH FAILOVER

摘要

One or more techniques and/or systems are provided for interconnect failover between a primary storage controller and a secondary storage controller. The secondary storage controller may be configured as a backup or failover storage controller for the primary storage controller in the event the primary storage controller fails. Data and/or metadata describing the data (e.g., data and/or metadata stored within a write cache) may be mirrored from the primary storage controller to the secondary storage controller over one or more interconnect paths. Responsive to identifying a failover trigger for a failed interconnect path, the secondary storage controller is instructed to fence (e.g., block) I/O operations from the failed interconnect path. Streams of data and/or metadata that were affected by the failure may be instructed to transmit such data and/or metadata over one or more non-failed interconnect paths to the secondary storage controller during failover of the failed interconnect path.

主权项

1. A method, comprising:
identifying a failover trigger associated with a first interconnect path between a first storage controller and a second storage controller; sending a fence instruction to the second storage controller, the fence instruction instructing the second storage controller to fence I/O operations from the first interconnect path; and responsive to receiving a fence acknowledgement message from the second storage controller, performing interconnect failover for the first interconnect path utilizing a second interconnect path to transmit storage information from the first storage controller to the second storage controller.