This article describes how to protect the security of cloud storage, a provable data possession scheme based on full-nodes of an AVL tree for multiple data copies in cloud storage. In the proposed scheme, a Henon chaotic map is first implemented for the node calculation of the AVL tree, and then the location of the data in the cloud is verified by AVL tree. As an AVL tree can keep the balance even with multiple dynamic operations made on the data in the cloud, it can improve the search efficiency of the data block, and reduce the length of the authentication path. Simulation results and analysis confirm that it can achieve good security and high efficiency.

Aiming to strike for a balance between the security, efficiency and availability of the data verification in cloud storage, a novel integrity verification scheme based on spatiotemporal chaos is proposed for multiple data copies. Spatiotemporal chaos is implemented for node calculation of the binary tree, and the location of the data in the cloud is verified. Meanwhile, dynamic operation can be made to the data. Furthermore, blind information is used to prevent a third-party auditor (TPA) leakage of the users' data privacy in a public auditing process. Performance analysis and discussion indicate that it is secure and efficient, and it supports dynamic operation and the integrity verification of multiple copies of data. It has a great potential to be implemented in cloud storage services.

Benefiting from its excellent performance and scalability, Ceph distributed storage is also confronting the problems, i.e. the unnecessary transfer of the data leading to the increasing consumption of the system which is triggered by the additions and deletions on the equipment. Aiming at the implement method of Ceph in system algorithm and logical layout, this paper has carried on research, analyzing its defects in the aspect of data transfer and resource consumption and puts forward the handling method of the failure node when the cluster storage device fails. Through the establishment of the cluster device flag in the process of data transfer, the optimized scheme of the data migration in the environment of production is realized, and the utilization of the system resources is improved. The experimental test results have shown that the scheme can reduce about the 30% -40% of transfer volume, effectively lower the resources consumption of Ceph distributed storage, as well as prevent invalid and excessive data transfer.