NetBackup concurrency control
To achieve optimal performance from a NetBackup storage server, it's essential to manage how many jobs can run concurrently. NetBackup provides several configurable settings that control job concurrency across disk pools, storage units, policies, and clients. Proper tuning of these parameters ensures balanced resource usage, prevents bottlenecks, and improves overall backup and restore efficiency.
Disk Pool I/O Stream Limit
Controls the maximum number of concurrent I/O operations (streams) allowed on a disk pool. Each backup/restore job counts as 1 stream.
Each optimized duplication (opt-dup) or AIR job counts as 2 streams.
Storage unit (STU) maximum concurrent jobs
Limits how many jobs can run concurrently on a specific storage unit. Ensure the total concurrent jobs across all STUs using the same disk pool do not exceed the disk pool's I/O stream limit.
Limit jobs per policy
Restricts the number of concurrent jobs that can run from a single backup policy. It prevents a single policy with many clients from consuming all available resources.
Maximum jobs per client
Limits how many concurrent jobs can run for a single client.