Virtual Tape Library Cartridge Re-serialization
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Solution Overview
Problem
Existing virtual tape libraries face challenges in replicating cartridges across different servers without causing conflicts during inventory and backup/restore processes due to identical serial numbers, and they lack a seamless method for renaming file names of replicated files.
Innovation Solution
A system and method for dynamically re-serializing the serial numbers of containers and corresponding cartridges using an activation code and a salt algorithm, allowing replicated cartridges to be presented with unique serial numbers while maintaining the same namespace, thus avoiding conflicts and enabling seamless replication and archival.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cartridges are replicated across different servers with identical serial numbers, then data redundancy and disaster recovery capability are improved, but conflicts occur during inventory and backup/restore processes
Solution Approach 1:
The system performs preliminary re-serialization of cartridge serial numbers during the replication process itself, rather than waiting for conflicts to occur. When data is replicated from a source VTL to a target VTL, the target VTL proactively generates unique serial numbers for the replicated cartridges, ensuring that no conflicts will arise during subsequent inventory or backup/restore operations.
Solution Approach 2:
The patent introduces an intermediary re-serialization layer between data replication and the backup management software. This intermediary process transforms the replicated data while preserving its integrity, adding unique serial numbers that act as mediators to prevent direct conflicts between identical cartridges on different servers.
2Object-generated harmful factors
If cartridge serial numbers are changed to ensure uniqueness across servers, then conflicts are eliminated, but compatibility with existing tape library protocols and software is compromised
Solution Approach 1:
The re-serialization process applies local quality by making serial numbers unique at the specific location (target VTL) where they are needed, while preserving the original serial number structure and namespace elsewhere. This allows each VTL to have locally unique identifiers without affecting the global compatibility of the tape library system.
Solution Approach 2:
The system changes the serial number parameter dynamically based on the target VTL's configuration and namespace. Rather than using fixed or universally unique identifiers, the serial numbers are adapted to match the specific namespace conventions of each target system, ensuring both uniqueness and protocol compatibility.
3Reliability
If a re-serialization process is implemented to generate unique serial numbers, then cartridge uniqueness across servers is ensured, but system complexity increases
Solution Approach 1:
The re-serialization process is self-service in that the target VTL automatically generates unique serial numbers for replicated cartridges without requiring manual intervention or complex external coordination. The system uses its own namespace configuration and the source cartridge's serial number as input to autonomously produce the unique identifier.
Solution Approach 2:
The patent uses copying as a foundation, where the target VTL copies the source cartridge's serial number and then applies a simple transformation (adding the target namespace prefix) to create the unique identifier. This copying approach is far simpler than implementing complex UUID generation or centralized serialization management systems.
Data Source
AI summary
Certain embodiments of the present disclosure provide systems and associated methods for dynamically re-serializing virtual tape library cartridges. The system comprises a first server node including a first virtual tape library residing on a deduplication file system, in which a backup data file corresponding to a first cartridge is stored in a first container with a first base prefix. A second server node includes a second virtual tape library residing on a second deduplication file system, and is configured to receive and store a replica of the backup data file corresponding to a second cartridge in a second container such that the second cartridge includes the same first base prefix as the first cartridge. An activation code is assigned to the second container, and used to re-serialize the first base prefix to form a second base prefix such that the second cartridge is presented with the second base prefix.