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Dating relating emc 10n directory

dating relating emc 10n  directory-49

A valid data item update retrieval and storage subsystem as defined in claim 7 in which said data item update storage control further controls storage of data item updates provided by a data item update source on the target storage medium.9.A valid data item update retrieval and storage subsystem as defined in claim 8, the target storage medium having associated therewith a target storage medium data item identifier flag set comprising a plurality of target storage medium data item identifier flags, each associated with a data item identifier, the data item update storage control conditioning the target storage medium data item identifier flags in response to the storage of data item updates on the target storage medium.10.

dating relating emc 10n  directory-10dating relating emc 10n  directory-70

A valid data item update retrieval and storage subsystem as defined in claim 16, the valid data item update identifier and the valid data item update transfer control operating during a space reclamation operation in which valid data item updates are copied from the source storage medium to the target medium, the data item update storage control during the space reclamation operation maintaining an auxiliary data item identifier flag set comprising a plurality of auxiliary data item identifier flags, each associated with a data item identifier, each flag having a plurality of conditions, the data item update storage control controlling the condition of the invalid flag of selected ones of the entries of said target storage medium's storage medium directory in relation to the condition of the auxiliary data item identifier flag asociated with the data item identifier of the respective entries.18.The back-up information storage subsystem receives and stores the generated information from the mass storage subsystem's control element.The back-up information storage subsystem includes a filter/buffer module, a tape log module and a reconstruction module.A digital data processing system comprises a host information generating device, a mass storage subsystem, and a back-up information storage subsystem.The host information generating device generates information and provides it to the mass storage subsystem for storage. A digital data processing system comprises a host information generating device, a mass storage subsystem, and a back-up information storage subsystem.a data item identifier flag set comprising a plurality of data item identifier flags, each associated with a data item identifier, each flag having a valid condition indicating that the source storage medium has a valid data item update associated with the respective data item identifier flag's associated data item identifier stored thereon, and at least one other condition; C.

a valid data item update identifier for using the storage medium directory and said data item identifier flag set to identify a set of valid data item updates on said source storage medium, the valid data item update identifier scanning the directory entries in said directory in reverse in reverse order and, for each directory entry, determining whether the data item identifier flag associated with the data item identifier contained in the directory entry indicates that the source cartridge has a valid data item update associated with the respective flag's associated data item identifier stored thereon and, if so, determining that the data item update associated with the directory entry is a valid data item update; D.

A valid data item update retrieval and storage subsystem as defined in claim 3 in which said iteration control element enables said directory entry selector to, in each of a series of iterations, select the one of the directory entries which precedes the directory entry selected during the preceding iteration.5.

A valid data item update retrieval and storage subsystem as defined in claim 4 in which said iteration control element enables said directory entry selector to, in a first iteration, select the last directory entry in the storage medium directory.6.

A valid data item update retrieval and storage subsystem as defined in claim 9 in which each target storage medium data item identifier flag has has a valid condition and at least one other condition, the data item update storage control conditioning the target storage medium data item identifier flags associated with data item identifiers for data item updates received from the data item update source and stored on said target storage medium to the valid condition.13.

A valid data item update retrieval and storage subsystem as defined in claim 12 in which said data item update storage control further selectively conditions the target storage medium data item identifier flags associated with data item identifiers for data item updates received from the source storage medium to one of the valid condition or the other condition.14.

The host information generating device generates information and provides it to the mass storage subsystem for storage.