Patent ID: 11860719
Assignee: HUAWEI TECHNOLOGIES CO., LTD.
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 15:
16. A storage system comprising:
a plurality of storage controllers comprising:
a first storage controller configured to process an access request of a host; and
a second storage controller that is different distinct from the first storage controller; and

a front-end interface card communicatively coupled to the storage controllers and the host and configured to:
detect a status of the first storage controller;
select the second storage controller for the host to process the access request when the first storage controller is in an abnormal state due to being offline, a power failure, an upgrade to the first storage controller, or unresponsiveness;
send, to the host when the first storage controller is in the abnormal state, an access request error message reporting an error status of the access request; and
again receive, from the host and in response to the access request error message, the access request.