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One DS4500 and two or more storage expansion enclosure types
in a mixed configuration
Note: Not all of the EXP500, EXP100, EXP700, EXP710 or EXP810 enclosures
can be cabled together. For information on supported combinations, see
“Supported storage expansion enclosure configurations and intermix
combinations” on page 62.
When you plan to cable the DS4500 Storage Subsystem to storage expansion
enclosure types that are in a mixed configuration, it is recommended that you cable
the same type of enclosures together. Since the EXP810s and EXP710s are
generally considered as the same type (enclosures with switched-ESMs type),
these two enclosure models must be grouped together if they are contained within a
drive loop. (For detailed information, see “Overview: Connecting storage expansion
enclosures to a storage subsystem” on page 65.) If a storage expansion type with
non Switched-ESMs, such as EXP100, is cabled between the EXP710s and
EXP810s, a "drive enclosure not cabled correctly" error will be displayed in
theDS4000 Storage Manager Recovery Guru.
In addition, it is strongly recommended, for such reasons as easier maintenance
and minimizing cabling errors, that you not only cable the same type of enclosures
together, but that you also cable the enclosures within groups of the same model.
For example, cable the EXP710s together, followed by all of the EXP810s, then
followed by all of the EXP100s, and so on.
Figure 75 on page 99 and Figure 76 on page 101 show two examples of
recommended cabling schemes of mixed enclosure types behind a DS4500 Storage
Subsystem using EXP100s, EXP710s, and EXP810s storage expansion enclosures.
Figure 76 on page 101 also shows the IBM-preferred method of cabling enclosures
when mixing EXP100, EXP710 and EXP810 enclosures in the same redundant
drive loop pair: a group of EXP100s, followed by a group of EXP810s followed by a
group of EXP710s. The EXP810s are sandwiched between the EXP100s and
EXP710s.
98 IBM TotalStorage DS4500 Fibre Channel Storage Subsystem: Installation, User’s, and Maintenance Guide