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EMC Fibre Channel Disk-Array Processor Enclosure (DPE) Hardware Reference
Installing a Rackmount DPE
remaining supply and cord support the full load. You must use a
rackmount cabinet with ac power distribution, and have main branch
ac distribution that can handle these values for the number of DPEs
and DAEs that you will interconnect.
Cooling The ambient temperature specification is measured at the front door
inlet. The site must have air conditioning of the correct size and
placement to maintain the specified ambient temperature range. The
air conditioning must be able to handle the BTU requirements of the
DPEs and any connected DAEs.
Cabling
Requirements
Use optical cables for connections to the external Fibre Channel
environment. Use a copper cable only (not an optical cable) to
connect a DPE to a DAE. The optical cables connect to the optical
GBIC on the SP.
DPE and DAE interconnections should maintain LCC consistency.
That is, one FC loop should connect the DPE’s SP A (which connects
internally to LCC A) and each DAE’s LCC A. The other FC loop
should connect the DPE’s SP B (which connects internally to LCC B)
and each DAE’s LCC B.
Do not leave an unused (that is, dangling) cable connected to any
Fibre Channel port because it may cause excess noise on the Fibre
Channel.
Addressing
Requirements
The addressing requirements vary depending on the environment,
fibre port (fabric), or the fibre loop (FC-AL).
Fabric Environments In a fabric environment, the DPE is addressed using the Source_ID
(SID) and the Enclosure Address (EA).
Source_ID
The Source_ID (SID) is a value that a switch in the external Fibre
Channel environment automatically assigns.
Enclosure Address (EA)
Each DPE and DAE on a back-end loop needs a unique enclosure
address (EA) that identifies the enclosure and determines disk
module addresses. The DPE has a fixed EA of 0 that you cannot
change. If you cable any DAEs to the DPE, you might want to set the
nearest DAE’s EA to 1, the next to 2, and so on. The enclosure address
is displayed in lights visible behind the front door.