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CloudTier Storage Tiering SDK (Hierarchical Storage Management, HSM) is a high-performance Windows file system filter driver development kit designed to optimize data storage by automatically moving data between high-cost local storage and low-cost remote or cloud storage. This SDK enables organizations to implement a Tier 0 (Hot) and Tier 1 (Cold) architecture without disrupting existing workflows or applications. Key features of the CloudTier SDK include: 1. Intelligent Stub Files: When a file is migrated to the cloud, it is replaced by a "stub" file. This stub looks and acts like the original file, maintaining all metadata (size, timestamps, attributes) but occupying zero physical space on the local disk. 2. Transparent Data Recall: When a user or application opens a stub file, the CloudTier filter driver intercepts the I/O request and retrieves the required data blocks from remote storage (S3, Azure, NAS, etc.) on-demand. 3. Policy-Based Migration: Define granular rules for data movement based on file type, size, or last access/modified time. For example, automatically move all .PDF files older than 60 days to the cloud. 4. Block-Level Access: For large files (e.g., 100GB), the SDK can retrieve only the specific data blocks requested by the application rather than downloading the entire file, significantly improving performance and reducing latency. 5. Secure && Seamless Integration: Supports AES-256 encryption for data at rest and during transit. The SDK integrates directly with the Windows Filter Manager, ensuring compatibility with antivirus and backup software. 6. Multi-Platform Cloud Support: Easily connect to Amazon S3, Azure Blob Storage, Google Cloud, or private NAS systems.