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Step 6

Verify Storage System Back-End Connections

Use the information below and the diagram to verify the enclosure address settings

and loop (bus) cabling for the DPE2 and any DAEs.

The CX300 DPE2 supports a single redundant Fibre Channel back-end loop (0). The

two independent loops from SP A and SP B are paired, and share access to the same

dual-port disk drives. Without an additional DAE, the CX300 DPE2 has its single

redundant loop over the midplane, and does not require back-end cabling.

The back-end (BE) port on each SP connects to the corresponding primary (PRI) port

on the first DAE in the loop; SP A connects to the PRI port on LCC A, SP B connects

to LCC B. The DAE expansion (EXP) ports connect to the next PRI ports in their

loops.

For the system to boot and operate, the DPE2 enclosure address must be EA 0. A DPE2

is always assigned EA 0 prior to shipment. Each DAE requires a unique enclosure

address (EA). The only valid EAs for a DAE are 1, 2, or 3. The first DAE with the

DPE2 should have an EA of 1, since it is the second EA on the loop. A second DAE

should have an EA of 2, and a third DAE should have EA 3.

The following figure includes DAE2Ps as the only disk-array enclosures. DAE2 and DAE2P

enclosures follow the same EA, loop balancing, and cabling conventions.

EA0/Loop 0

BE 0 BE 0

EMC3223

EXP PRI

EXPPRI

EXP PRI

EXPPRI

EXP PRI

EXPPRI

EXP PRI

EXPPRI

EA2/Loop 0

EA1/Loop 0

EXP PRI

EXPPRI

EXP PRI

EXPPRI

EA3/Loop 0

Loop 0

PRIEXP

EXP

PRI

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