These are the steps I took to turn SCSI RAID disks into a usable
DFS aggregate.  Basically, there's 4 steps.

1)  Create the RAID Array.  This creates an hdisk.
2)  Create a Volume Group on that hdisk.
3)  Create a Logical Volume on that Volume Group.
4)  Run the newaggr command to make it usable to DFS.

--------------------------------------------------------------------
Step 1)  Create the RAID Array.  This creates an hdisk.

From smitty,
   ->Devices
      ->Disk Array
         ->IBM 2493 PCI SCSI Disk Array
            ->PCI SCSI Disk Array Manager
               ->Create a PCI SCSI Disk Array
                  -Select the PCI SCSI RAID Adapter you want.
                  -Answer RAID Level 5
                  -Insure all the disks you want are there.
--------------------------------------------------------------------
Step 2)  Create a Volume Group on that hdisk.
From smitty,
   ->System Storage Management (Physical & Logical Storage)
      ->Logical Volume Manager
         ->Volume Groups
            ->Add a Volume Group
               -VOLUME GROUP name = scsi0vg
               -Physical partition SIZE in megabytes = 32
               -PHYSICAL VOLUME names = hdisk4
--------------------------------------------------------------------
Step 3)  Create a Logical Volume on that Volume Group.
From smitty,
   ->System Storage Management (Physical & Logical Storage)
      ->Logical Volume Manager
         ->Logical Volumes
            ->Add a Logical Volume
               -VOLUME GROUP name = scsi0vg
               Then
               -Logical volume NAME = scsi0lv
               -Number of LOGICAL PARTITIONS = (whatever lsvg scsi0vg says is free)
                                               (remember, this is 32MB PP's)
               -Logical volume TYPE = jfs      (perhaps should be lfs)
               -MAXIMUM NUMBER of LOGICAL PARTITIONS = (likely have to increase   )
                                                       (from default of 512, to   )
                                                       (accomodate # of LP's above)
--------------------------------------------------------------------
Step 4)  Run the newaggr command to make it usable to DFS.
From smitty,
   ->Communications Applications and Services
      ->DCE (Distributed Computing Environment)
         ->DFS (Distributed File Service) Administration
            ->Add / Delete LFS Aggregates and Filesets
                   If this option isn't on your smitty screen, then you
                   need to install the dce.compat.edfs.smit fileset.
               ->Export an Aggregate from the Local Machine
                  -Answer "2 yes" to INITIALIZE device for LFS?
                  Then
                  -DEVICE to export as aggregate = /dev/scsi0lv
                  -Aggregate NAME = scsi0