1. A failover method for responding to configuration node failures in a SAN Volume Controller (SVC) cluster, wherein the SVC cluster manages a plurality of storage devices and comprises a plurality of SVCs interconnected via the internet, each SVC acting as a separate node, and at any given time, only one node within the SVC cluster functions as a configuration node to operate external services, the method comprising: activating a new configuration node in response to failures of an original configuration node; obtaining client subscription information related to storage device events managed by the SVC cluster from the plurality of storage devices with the new configuration node, wherein the plurality of storage devices are not in the original configuration node; retrieving the storage device events from a storage device event monitoring unit with the new configuration node in response to the storage device events occurring in the plurality of storage devices managed by the SVC cluster; sending the storage device events to subscribed clients with the new configuration node based on the obtained client subscription information; and saving, with the original configuration node, a storage device event log including at least an event code, an event description, and whether the storage device events were handled, including: making an entry in the storage device event log every time the original configuration node receives one of the storage device events and setting the entry to “NO” for whether the one of the storage device events has been handled or not, and setting the entry to “YES” for whether the one of the storage device events event has been handled or not after the original configuration node notifies the respective subscribed clients about those of the storage device events the original configuration node receives.