We have a 3 TB disk storage pool that until recently, has been filling up 
partially during backups, and then emptying as the data is migrated to tape. 
The storage pool is now at 84% and climbing. I have 4 LTO4 Ultrium drives that 
can't seem to migrate the data fast enough at all. Watching nmon, I am only 
getting around 30MB/s total when all four drives are in use. They are all 
assigned to ne HBA because of a lack of slots in the AIX server. I previously 
had cache turned on for the disk storage pool (it is now off), so I am 
wondering if the terrible performance is because the disk storage pool is 
extremely fragmented because cache was turned on for so long. Any ideas how to 
offload the data to tape faster?
John