Two node clusters recovery on a failure

A non-transitory computer readable medium having stored thereon a sequence of instructions which, when executed by a processor causes the processor to perform a process comprising:

• detecting a failure condition between a first node and a second node in a computing cluster that comprises a storage pool that is accessed by the first and second nodes;
• in response to detecting the failure condition, stopping execution of an I/O operation to the storage pool by the first and second nodes;
• accessing a witness node in an on-demand basis, wherein an atomic leadership election operation is initiated to form a quorum that includes the witness node, the atomic leadership election operation providing a leadership lock to only a single requestor, the single requestor corresponding to only one of the first or second nodes;
• and
• initiating, by the single requestor having the leadership lock, a disaster recovery operation for the computing cluster.

A system for disaster recovery of two-node computing clusters, the system comprising:

• a storage medium having stored thereon a sequence of instructions;
• and
• a processor that execute the instructions to cause the processor to perform a process comprising,
• detecting a failure condition between a first node and a second node in a computing cluster that comprises a storage pool that is accessed by the first and second nodes;
• in response to detecting the failure condition, stopping execution of an I/O operation to the storage pool by the first and second nodes;
• accessing a witness node in an on-demand basis, wherein an atomic leadership election operation is initiated to form a quorum that includes the witness node, the atomic leadership election operation providing a leadership lock to only a single requestor, the single requestor corresponding to only one of the first or second nodes;
• and
• initiating, by the single requestor having the leadership lock, a disaster recovery operation for the computing cluster.