IBM DS4000 EXP810, Инструкция по установке, использованию и обслуживанию

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The EXP810 provides redundant loop support when the second ESM is configured,
and when both loops (called A and B) are connected to a DS4000 that supports
redundant loops. If a cable or SFP module fails on drive loop A, drive loop B
provides redundancy, which is an alternate path to your disk drives.
Notes:
1. The EXP810 supports 2 and 4 Gbps fibre channel and SATA E-DDMs.
2. When intermixing EXP810s and EXP710s in the same drive channel/loop, even
though the storage expansion enclosures do not need to be grouped by drive
enclosure type/model, IBM recommends that you group them by enclosure
type/model in a redundant drive channel pair to simplify maintenance and
troubleshooting.
3. You cannot mix storage expansion enclosures with different speed settings in
the same drive loop.
Example of a correct redundant drive loop
Figure 34 on page 55 shows a redundant drive loop that you might create with a
DS4800 Storage Subsystem and four EXP810s. The numbers provided in Figure 34
on page 55 show the order in which cables should be attached. Note that the
controller port is connected to the port labeled 1B on both the right and left ESMs.
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IBM System Storage DS4000 EXP810 Storage Expansion Enclosure: Installation, User’s and Maintenance Guide