Data Manager¶

The Data Manager enforces policies concerning data access and storage resource consumption.

Its responsibilities include:

• Granting access to data blocks (according to permissions found in the system/metadata DB)
• Monitoring and adjusting redundancy of valuable data blocks (according to targets found in system/metadata DB)
• Deleting unneeded data blocks to increase disk space
• Rebalancing data blocks among available disks
• Monitoring block read and write activity
• Monitoring free disk space
• Monitoring disk activity
• Monitoring disk performance and health (via SMART and empirical measurement)
• Tracking physical disk changes (disks added, removed, moved)
• Collecting per-user, per-group, per-node, and per-disk usage statistics