Dell Products Inc.

Deepu M Sreedhar

Bing Liu

Joel Vance Miller

Joel Miller

A request is received to upgrade firmware of a set of disk array enclosures (DAEs) in a storage system. Each DAE is chained to another DAE by first and second chains. The first chain provides an active path from a host server to the DAEs. The second chain provides a secondary path from the host server to the DAEs. A determination is made as to whether the secondary path is operational. If the secondary path is operational, data of the active path is failed over to the secondary path, the active path now being an inactive path. Firmware along the inactive path is upgraded. If the secondary path is not operational, the request to upgrade firmware is denied.

Framework for upgrading firmware of disk array enclosures (DAES)

A request is received to upgrade firmware for disk array enclosures (DAEs). Each DAE is reachable by a host server using first and second paths. The first path extends from a first port of a first HBA of the host server to each of a set of first input/output modules (IOMs) in the DAEs. The first IOMs have first SAS expanders to which storage disks are connected. The second path extends from a second port of a second HBA of the host server to each of a set of second IOMs in the DAEs. The second IOMs have second SAS expanders to which the disks are connected. The first port is changed from a first state during which a SAS driver exposes all topology change events to an OS of the host server to a second state during which the SAS driver does not expose all of the topology change events.

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Calicut, India

Deepu M Sreedhar