Synchronous local and cross-site failover in clustered storage systems

A storage node for use in a first cluster of a clustered storage system, the storage node comprising:

• an interface configured to receive a cluster switchover request to failover from a second cluster located at a second site of the clustered storage system to the first cluster located at a first site;
• a node management module configured to process the cluster switchover request to identify a first partner node in the first cluster and a second partner node in the second cluster, and assign ownership of a first storage container in a shared storage fabric from the second partner node to the storage node in response to the cluster switchover request, wherein the first storage container is located at the first site, the first partner node and the storage node form a first high-availability (HA) group, the second partner node and a third partner node in the second cluster form a second HA group, and the first HA group and the second HA group forming a disaster recovery (DR) group and share the storage fabric with each other;
• and
• a cache system configured to store cache data associated with the storage node, replicated cache data associated with the first partner node, and replicated cache data associated with the second partner node.

A method comprising:

• receiving, by a source cluster, a client write request including write data and an indication of a logical container indicating a location to which to write the write data;
• identifying, by the source cluster, a source node in the source cluster, the source node associated with the logical container and including a source cache system;
• identifying, by the source cluster, a first partner node in the source cluster and a second partner node in a destination cluster, the first partner node having a first cache system and the second partner node having a second cache system;
• and
• concurrently writing, by the source cluster, the client write data to the source cache system, the first cache system, and the second cache system.