Method of inserting a validated time-image on the primary CDP subsystem in a continuous data protection and replication (CDP/R) subsystem

A computer-readable storage medium comprising instructions executable by a computer system, wherein the computer system implements a method in response to executing the instructions, the method comprising:

• generating a backup image at a secondary system, wherein the backup image comprises a copy of first data received from a primary system;
• validating the backup image at the secondary system, wherein the validating continues as second data is received from the primary system;
• storing the second data in a memory, if the validating is unfinished, wherein the memory is coupled to the secondary system;
• receiving a request for third data from the primary system, wherein the third data corresponds to a timestamp;
• determining if the memory comprises the third data;
• returning the third data from the memory, if the memory comprises the third data;
• accessing a validation table entry corresponding to the timestamp, if the memory does not comprise the third data, wherein
• the validation table entry indicates a validation result of an image,
• the validation result was generated before the receiving the request;
• selecting the image, if the validation result indicates a successful validation;
• returning the third data from the image, if the validation result indicates a successful validation;
• selecting an earlier image, if the validation result indicates a failed validation, wherein
• the earlier image is a successfully validated image, and
• the earlier image is a most recently validated image generated prior to the timestamp;
• returning the third data from the earlier image, if the earlier image is successfully validated;
• and
• wherein
• the backup image, the image, or the earlier image comprises a point-in-time copy of the third data, and
• the memory stores a copy of a version of the third data written to the memory since creation of the point-in-time copy of the third data.

A system comprising:

• a primary system for storing a data object;
• a secondary system coupled to the primary system for storing a replication of the data object, wherein the computer system comprises a first computer system for processing data of a first image of the replication of the data object;
• wherein the secondary system comprises a second computer system, wherein the second computer system comprises a memory that stores instructions executable by the second computer system, wherein the second computer system implements a method if the second computer system executes the instructions, the method comprising:
• generating a backup image at a secondary system, wherein the backup image comprises a copy of first data received from a primary system, validating the backup image at the secondary system, wherein
• the validating continues as second data is received from the primary system, storing the second data in a memory, if the validating is unfinished, wherein the memory is coupled to the secondary system,
• receiving a request for third data from the primary system, wherein the third data corresponds to a timestamp,
• determining if the memory comprises the third data,
• returning the third data from the memory, if the memory comprises the third data, accessing a validation table entry corresponding to the timestamp, if the memory does not comprise the third data, wherein
• the validation table entry indicates a validation result of an image,
• the validation result was generated before the receiving the request,
• selecting the image, if the validation result indicates a successful validation,
• returning the third data from the image, if the validation result indicates a successful validation,
• selecting an earlier image, if the validation result indicates a failed validation, wherein
• the earlier image is a successfully validated image, and
• the earlier image is a most recently validated image generated prior to the timestamp;
• returning the third data from the earlier image, if the earlier image is successfully validated;
• and
• wherein
• the backup image, the image, or the earlier image comprises a point-in-time copy of the third data, and
• the memory stores a copy of a version of the third data written to the memory since creation of the point-in-time copy of the third data.