COMMUNICATION OF CONDITIONS AT A PRIMARY STORAGE CONTROLLER TO A HOST

摘要

A primary storage controller is maintained in a copy relationship with a secondary storage controller, wherein the primary and secondary storage controllers are coupled to a host that is configurable to use the secondary storage controller instead of the primary storage controller. The primary storage controller determines occurrence of at least one condition in the primary storage controller, wherein the at least one condition occurs prior to a failure of the host to perform an Input/Output (I/O) operation with respect to at least one storage volume of the primary storage controller. The primary storage controller communicates the occurrence of the at least one condition to the host, wherein in response to the communicating the host is configured to determine whether to use the secondary storage controller instead of the primary storage controller based on the occurrence of the at least one condition.

主权项

1. A method, comprising:
maintaining a primary storage controller in a copy relationship with a secondary storage controller, wherein the primary and secondary storage controllers are coupled to a host; determining, by the primary storage controller, occurrence of at least one condition in the primary storage controller, wherein the at least one condition occurs prior to a failure of the host to perform an Input/Output (I/O) operation with respect to at least one storage volume of the primary storage controller, and wherein subsequent to the occurrence of the at least one condition but prior to the failure of the host to perform the I/O operation, the host performs other I/O operations with respect to the at least one storage volume of the primary storage controller; and communicating, by the primary storage controller, the occurrence of the at least one condition to the host to provide an indication of a possibility of potential error at a future point in time, wherein the host determines whether it is more effective to use the secondary storage controller instead of the primary storage controller in comparison to waiting for the primary storage controller to complete error recovery subsequent to the occurrence of the at least one condition.