Hitachi Compute Blade 2000 User Manual page 1538

The primary server blade can be installed in slot 0 and slot 4 in the 4-blade SMP
configuration. The slot to which the primary server blade is installed is the partition
number.
Server blade slot number
0 1 2 3 4 5 6 7
0 1 2 3 4 5 6 7
7
Partition number 0 Partition number 4
Slot location for 4-blade SMP configuration
1487