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One DS4700 Express and two or more storage expansion
enclosures in a mixed configuration
A mixed configuration is a configuration in which you have more than one type of
storage expansion enclosure. If possible, it is recommended that you do not mix
different types of storage expansion enclosures in the same drive channel pair.
Figure 58 on page 77 shows the recommended cabling topology if you have three
EXP710s and three EXP810s attached to the DS4700 Express. (The EXP710s are
denoted in the graphic as 1 while the EXP810s are denoted as 2.)
Note: If you are mixing EXP100s with EXP710s and EXP810s, Figure 58 on page
77 is not the recommended cabling topology. Additional cabling rules and
restrictions apply. See “One DS4700 Express and two or more storage
expansion enclosures in a mixed configuration” on page 94.
Left ESM
Left ESM
Right ESM
Right ESM
Controller A
Controller B
1
2
2
1
ds470051
Left ESM
Right ESM
Left ESM
Right ESM
Left ESM
Right ESM
Left ESM
Right ESM
ds470058
Figure 57. One DS4700 Express and up to six storage expansion enclosure — Not
recommended
76 IBM System Storage DS4700 Express Storage Subsystem: Installation, User’s and Maintenance Guide