12.Connect port 2 of drive channel 2 on the DS4700 Express to port 1B (1) on the right ESM in the sixth EXP810 (7).
One DS4700 Express and two or more storage expansion enclosures in a mixed configuration
When you cable the DS4700 Express Storage Subsystem to storage expansion enclosures that are in a mixed configuration, it is recommended that you cable the same type of enclosures together. If it is not possible to cable each group of enclosures by model type (EXP100s, EXP710s, and EXP810s) in a separate redundant drive loop pair or behind each port of the
In addition, when an EXP100 is the first storage expansion enclosure cabled directly to the storage subsystem's controller drive port, follow these rules:
vCable from the storage subsystem controller drive port to the OUT port on the left ESM (ESM A) of the EXP100.
Note: This is a change from previous cabling recommendations where you cabled from the controller drive port to the IN port on the left ESM (ESM
A)of the EXP100.
vIf an EXP100 follows the initial EXP100, cable from the IN port on the left ESM (ESM A) of the first EXP100 to the OUT port on the left ESM of the next EXP100. Continue this cabling pattern until you encounter an EXP710 or EXP810, then cable from the IN port on the left ESM (ESM A) of the EXP100 to the IN port of the EXP710 or EXP810.
vIf an EXP710 or EXP810 follows the initial EXP100, cable from the IN port on the left ESM (ESM A) of the EXP100 to the IN port of the EXP710 or EXP810. To cable to the next storage expansion enclosure in the chain, cable from the OUT port of the left ESM of the EXP710 or EXP810 to the IN port of the next storage expansion enclosure.
vContinue the left ESM (ESM A) cabling pattern by cabling from the OUT port to the IN port on subsequent storage expansion enclosures until you complete the chain.
Figure 76 on page 95 shows an acceptable EXP710, EXP810 and EXP100 intermix configuration in a DS4700 Express environment. The cabling is acceptable because it follows the cabling recommendations.
94IBM System Storage DS4700 Express Storage Subsystem: Installation, User’s and Maintenance Guide
