– Monitors data usage to update priority status – Migrates lower priority data to slower storage media – Uses “stubs” or pointers to locate migrated data – Automatically updates stubs to reflect file locations
• Additional features provided by ADM:
– Discovery and classification tools
• How do administrators locate and categorize information?
– Policy engine:
• Type and detail of criteria used to prioritize data
– Number and type of media options for migration
• Multiple levels of online, nearline, offline storage
– Transparency of archived file retrieval
• Depends in part on storage media
All HSM software prioritizes data. However, not all HSM applications use the same criteria. Typical criteria include: Age of data
Frequency of access Time of most recent access
ADM software should provide a more robust set of tools that can be customized to conform to the company’s business model. This includes: Discovery and classification tools that help administrators locate and categorize information A flexible policy engine that allows administrators to customize the type and detail of criteria used to prioritize data
HSM software and ADM software also differ in the archival media supported. HSM supports migration to tape. ADM also supports multiple levels of service (QoS) for online, nearline, and offline storage. The speed and transparency of file retrieval depends upon the amount and type of information in the stub and the performance of the media to which the file was migrated.