System and method for non-disruptive check of a mirror

A computer storage system apparatus for verifying data, comprising:

• a source computer serving a first data set;
• a destination computer operatively connected to the source computer, the destination computer serving a second data set;
• the source computer further sending a list of a Persistent Consistency Point Images (PCPIs) for the first data set and the second data set to the destination computer;
• the source computer further sending a data stream for the list of PCPIs and the first data set to the destination computer;
• the destination computer further comparing information of the data stream with the second data set;
• and
• at least one of the source computer and the destination computer, in response to an inconsistency between the information of the data stream and the second data set, to log the inconsistency to a verification login.

A non-transitory computer-readable storage media device containing executable program instructions for execution by a processor, the computer-readable storage media device comprising:

• program instructions that receive, at a second computer to host a second data set, a list of Persistent Consistency Point Images (PCPIs) sent from a first to host a first data set, the list of PCPIs for the first data set and the second data set;
• program instructions that receive at the second computer a data stream sent from the first computer, the data stream for the list of PCPIs and the first data set;
• program instructions that compare at the second computer information of the data stream with the second data set;
• and
• program instructions that log the inconsistency at the second computer to a verification log in response to an inconsistency between the information of the data stream and the second data set.