I tried the changes as per HEMANPR and all looks good for now. No backups failed last night with error 84. We'll see how it goes for the rest of this week.
I am having the same issue here. We have pretty much the same setup. NetBackup 6.5.5 with a DXi7500 using OST. We were running firmware 1.2.1 on the DXi with the associated DXi plugin and had no issues. Last week, a Quantum tech came and upgraded the...