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Digital Data Archive System and Data Recording Method

IP.com Disclosure Number: IPCOM000180084D
Original Publication Date: 2009-Mar-04
Included in the Prior Art Database: 2009-Mar-04
Document File: 2 page(s) / 63K

Publishing Venue

IBM

Abstract

Disclosed is the method to keep association between files in the same object to bind them even after migration to a removable media.

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Digital Data Archive System and Data Recording Method

 Disclosed is the method to keep association between files in the same object to bind them even after migration to a removable media.

 Recently, a data object is handled as a primary unit of data, which is the combination of files that are organized with the specific purpose. The simplest combination consists of the data and its metadata, where the data is a file such in specific format as MPEG and the metadata has supplemental information of the data. Since files in an object are independent and accessed as separated instances, a way to bind them is needed.

 The method disclosed here is about the method to keep association between files in the same object. To simplify the scope of disclosure, the method is described with two file instances; the data file and its metadata file (Figure 1), which are logically bound with a unique identifier named dm-id. To identify instance type, the access controller in Figure 1 provides two ports; the data port and the metadata port: a write access through the data port is classified to the data type and through the metadata port is to the metadata type.

n instance written through the

                             n instance written through the metadata port has m-id as its unique identifier. Those three identifiers; dm-id, d-id and m-id are stored in a local database in the Access Controller as the tables; dm-a and dm-l in Figure 1. The dm-a keeps the association of those three identifiers. The dm-l keeps the location of instances in the storage system under the Access Controller. The table in Figure 1 allows multiple locations per file instance.

 When files in an object are exported to a physical media, grouping may be done before export operation in order to export objects in group basis (Figure 2). When the files; the data file and the metadata file are exported, the associated dm-a row in the...