>We back up around 220 Gb of data to the disk pool overnight, then migrate >(with caching on) to cartridge in the morning. >
I assume you mean TSM storage pool caching rather than 3390 caching. If so, I'd turn off caching for a day and see if that makes a difference. It is my understanding that TSM caching, while optimizing restore times, can cause performance problems in other TSM areas. David
