Patent ID: 8438135
Filing Date: 2013-05-07
Classification: G06F

Abstract:
1. A method comprising: providing data protection to data in a first volume at a first data protection appliance by storing a copy of the data in a second volume using a second data protection appliance; tracking changes between data locations in the first volume and the second volume using a delta marking stream (DMS), the DMS comprising a stream of metadata comprising input/output requests (I/Os) completed to the first volume which have not yet been applied to a replication journal and I/Os applied to the replication journal which have not been completed to the second volume, the replication journal comprising a DO stream, an UNDO stream, a DO metadata stream and an UNDO metadata stream; receiving, at the first data protection appliance, metadata not yet committed to the DMS; and mirroring the metadata at a third data protection appliance, wherein mirroring the metadata at the third data protection appliance comprises mirroring the metadata at a third data protection appliance in a same cluster as the first data protection appliance, wherein the same cluster comprises the first data protection appliance and the third data protection appliance.