About file system capacity and NetBackup performance
Ample file system space must exist for NetBackup to record its logging entries or catalog entries on each primary server, media server, and client. If logging or catalog entries exhaust available file system space, NetBackup ceases to function.
Veritas recommends the following:
As AdvancedDisk Pools and media server deduplication disk pools get close to full, NetBackup begins limiting the number of concurrent jobs to 1. See the NetBackup AdvancedDisk Storage Solutions Guide for more information.