Dell Products Inc.

Omer Margolin

Leonid Ravich

Eran Banin

Techniques for avoiding race conditions in high availability (HA) storage systems that employ disk array enclosures (DAEs). The techniques include receiving a notification of an input/output (IO) error from a storage node, in which the IO error occurs subsequent to the storage node issuing, to a first DAE controller, an IO operation to access data at a logical address of a storage device. The techniques further include, in response to the notification of the IO error, issuing, over an out-of-band channel, a flush command to the first DAE controller, causing data stored in cache memory of the first DAE controller to be written to the storage device, and receiving, over the out-of-band channel, an acknowledgement of completion of the flush operation from the first DAE controller. The techniques further include sending a notification of the completion of the flush operation to the storage node.

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Tel Aviv, Israel

Omer Margolin