Method and system for evaluating data reliability of distribution type storage system

The invention provides a method for evaluating data reliability of a distribution type storage system. The method comprises the following steps of: determining the number of data block copies and a target node corresponding to each copy; according to the working state of the target node, respectively calculating the reading success probability and the writing-in success probability of the data blocks; according to a preset data distribution strategy and the reading success probability of the data blocks, calculating the reading data success probability of the whole system; according to the preset data distribution strategy and the writing-in success probability of the data blocks, calculating the writing data success probability of the whole system; according to the reading data success probability and the writing data success probability of the whole system, judging the reliability of the data in the distribution type storage system and performing evaluation of the data distribution on the data reliability in the distribution type storage system. The invention further provides a system for evaluating data reliability of the distribution type storage system, wherein the system also can be used for performing evaluation of the data distribution on the data reliability in the distribution type storage system.