1. A computer program product comprising: one or more computer-readable storage media, wherein the one or more computer readable storage media is not a transitory signal per se, and program instructions stored on the one or more computer-readable storage media, the program instructions comprising: program instructions to receive a first record from a first source that relates to a first subject entity, wherein the first subject entity is subject to inventory management; program instructions to receive a second record from a second source that relates to a second subject entity where it is unknown whether the first subject entity is the same as the second subject entity, wherein the second subject entity is subject to inventory management, and wherein the second record is different than the first record, wherein the second source is different than the first source; program instructions to compare a first external/non-key attribute value for the first subject entity to a second external/non-key attribute value for the second subject entity; program instructions to determine a probability value corresponding to the probability that the first subject entity and the second subject entity are the same based, at least in part, upon the comparison of the first external/non-key attribute value to the second external/non-key attribute value; in response to the probability being above a predetermined threshold, program instructions to merge the first record relating to the first entity and the second record relating to the second entity, wherein the merged records relate to a reconciled entity; and program instructions to generate a reconciled record, wherein the reconciled record relates to a record selected from the first entity, the second entity, and the reconciled entity; wherein: the first external/non-key attribute value includes a temperature of the disk, a fan speed, and memory usage; and the second external/non-key attribute value includes a temperature of the disk, a fan speed, and memory usage.