SCO 5.0.5B and Informix

[jeager]

PRESENTLY:
running SCO 5.0.5B and Informix 7.3 with hard drives hd00(rhd00)
| Name | Type | New FS | # | First Block | Last Block |
+-------------------+------------+--------+---+-------------+------------+
| boot | EAFS | no | 0 | 0| 15359|
| swap | NON FS | no | 1 | 15360| 406527|
| root | HTFS | no | 2 | 406528| 2080406|
| | NOT USED | no | 3 | -| -|
| | NOT USED | no | 4 | -| -|
| | NOT USED | no | 5 | -| -|
| recover | NON FS | no | 6 | 2080407| 2080416|
| hd0a | WHOLE DISK | no | 7 | 0| 2088417|
hd10(rhd10)
| Name | Type | New FS | # | First Block | Last Block |
+-------------------+------------+--------+---+-------------+------------+
| u | HTFS | no | 0 | 0| 4425906|
| | NOT USED | no | 1 | -| -|
| | NOT USED | no | 2 | -| -|
| | NOT USED | no | 3 | -| -|
| | NOT USED | no | 4 | -| -|
| | NOT USED | no | 5 | -| -|
| | NOT USED | no | 6 | -| -|
| d1157all | WHOLE DISK | no | 7 | 0| 4433907|
and the 7.3 on HD20(rhd20)
+-------------------+------------+--------+---+-------------+------------+
| Name | Type | New FS | # | First Block | Last Block |
+-------------------+------------+--------+---+-------------+------------+
| chunk1 | NON FS | no | 0 | 10| 2097151|
| chunk2 | NON FS | no | 1 | 2097152| 4194302|
| chunk3 | NON FS | no | 2 | 4194303| 4241159|
| | NOT USED | no | 3 | -| -|
| | NOT USED | no | 4 | -| -|
| | NOT USED | no | 5 | -| -|
| | NOT USED | no | 6 | -| -|
| d1257all | WHOLE DISK | no | 7 | 0| 4249160|.

CHUNK3 not in use presently.

I need to load the 9.2 informix on the system as a parallel engine so that I can switch back and forth for testing purposes.

QUESTION:
What steps would I take to repartition the HD20(rhd20)for chunks1 through chunk4 and have the system recognize the new setup.

TIA
Jerry