Managing disk pool limits for high concurrency
If a user anticipates higher NetBackup job concurrency than the cluster can support, it's essential to configure NetBackup disk pool limits appropriately for all disk pools created from the same SpanFS cluster.
Conservative approach:
The sum of disk pool limits should be less than or equal to the cluster's maximum job concurrency.
To account for rolling upgrades or temporary node failures, disk pool limits should be adjusted downward accordingly.
Aggressive approach:
If the user does not expect all disk pools to reach their maximum job limits simultaneously, the combined disk pool limits may exceed the cluster's maximum concurrency.
However, if actual job concurrency exceeds the cluster's capacity, some jobs may fail due to lack of permits.
Refer to the Best practices: Disk pool configuration - setting concurrent jobs and maximum I/O streams topic of the NetBackup Backup Planning and Performance Tuning Guide for the general principles that are applicable to NetBackup Direct-IO.