Method and apparatus for preventing journal loss on failover in symmetric continuous data protection replication

An apparatus comprising:

• a processor;
• and
• memory encoded with instructions that, when executed by the processor, causes the apparatus to perform the operations of:
• maintaining, in a journal-based replication environment comprising a production volume at a production site and a replica volume at a replication site, a local journal at the production site and a remote journal at the replication site;
• detecting a failover event in the journal-based replication environment;
• and
• performing journal-based replication from the replica volume at the replication site to the production volume at the production site using the remote journal at the replication site in response to detecting the failover event.

A computer program product having a non-transitory computer readable storage medium with instructions encoded thereon that, when executed by a processor of a computer, causes the computer to symmetrically preserve a journal, the computer program product comprising:

• computer program code for maintaining, in a journal-based replication environment comprising a production volume at a production site and a replica volume at a replication site, a local journal at the production site and a remote journal at the replication site;
• computer program code for detecting a failover event in the journal-based replication environment;
• and
• computer program code for performing journal-based replication from the replica volume at the replication site to the production volume at the production site using the remote journal at the replication site in response to detecting the failover event.