Tim, "It is possible to pre-define the volumes with DEFINE VOLUME (I have not tried this)."
The limitation of one file system per FILE device class affects scratch volumes only. As far back as ADSM 3.1 I had FILE volumes belonging to one DevClass defined on six different disk file systems. Your suggestion works just as one would expect. We pre-defined the FILE volumes to the storage pool and everything worked fine for years. Allowed us to spread the disk load across all those disks without using RAID. Tab Trepagnier TSM Administrator Laitram L.L.C.
