IBM Midrange System DS4000 Series Hardware Manual page 81

When attaching the ninth or more enclosures, attach them to existing disk loops by
daisy-chaining them. A 256 disk configuration should have two expansion enclosures on each
drive-side channel pair and uses 16 EXPs in summary, as shown in Figure 3-37.
Figure 3-37 DS5000 with 16 disk enclosures
63
Chapter 3. IBM System Storage DS4000 and DS5000 hardware