| 摘要 |
This invention relates to field of cloud storage technology and especially relates to a cloud storage data access method, apparatus and system. The data storing step comprises: creating parity values of original data on a data transmitting end before the original data is transmitted to multiple cloud storage centers; transmitting and storing the original data and the parity values according to a preset redundant storing rule into the cloud storage data centers separately; the data retrieving step comprises: following the preset redundant storing rule to access at least one of the cloud storage data centers into which the original data is stored according to an access request; determining whether the original data is available in the accessed cloud storage data center, if not available, retrieving the parity value of the original data and the data used to create the parity value from at least one of the other cloud storage data centers according to the preset redundant storing rule; restoring the original data from its parity value and the data used to create the parity value. This invention also provides a cloud storage data access apparatus and system. This invention has enhanced the data availability and fault tolerance of cloud storage. |
