| 摘要 |
Methods of versioning or backing up data a hierarchical storage management, HSM, system which includes at least a first storage tier and second storage tier managed by a HSM client and HSM server respectively, wherein the HSM server and the HSM client are interconnected via a network of the HSM system, wherein a data item stored in the HSM system is associated with a HSM status parameter that is stored in the HSM client, the HSM status parameter having a first, second or third value, the first value indicating a pre-migrated state of the data item in which the data item is stored in the first and second storage tiers, the second value indicating a migrated state of the data item in which the data item is stored in the second storage tier, the third value indicating a resident state of the data item in which the data item is stored in the first storage tier, wherein in case the HSM status parameter has at least one of the first and second values the data item is further associated with a predetermined initial object ID that is stored in the HSM client and the HSM server, the initial object ID corresponding to a first version of the data item, the HSM server being configured with a data structure comprising an object ID field comprising at least the initial object ID and a newly created parent object ID field comprising the initial object ID. |
