Planning; Wiring Diagram - HPE Synergy 12Gb SAS Storage User Manual

Planning

Wiring diagram

Before planning a frame level layout for your storage and compute modules, it is helpful to understand
some basic principles of how the frame is designed and how the connections are made between compute
and storage modules. D3940 Storage Module may be connected to any P542D Controller equipped
compute module that is installed in the same frame with the following configuration options:
•
Redundant pairs of HPE Synergy 12Gb SAS Connection Module
•
Nonredundant single HPE Synergy 12Gb SAS Connection Module
As a best practice, Hewlett Packard Enterprise recommends designing your storage fabric for full
redundancy; however, nonredundant solutions are supported with the correct configuration. In the
following figure you will see how the fabric allows for connections to single or dual I/O adapters in each
storage module, as well as routing required in nonredundant connections.
When configured for redundancy two connection modules are configured in the frame residing in ICM
bays 1 and 4, and each storage module contains a pair of I/O adapters. This provides dual paths for each
P542D controller to be able to connect with any storage module in the frame regardless of where in the
frame the storage module is configured. However, when there are configurations where there is either
only a single connection module present or the connection modules and storage modules are configured
nonredundant, make sure that the storage modules are aligned in the correct module bays to be serviced
by the correct connection modules.
A SAS Connection module in ICM bay 1 will provide connection from the primary I/O adapter to any
storage module in device bays 1-6. For device bays 7-12, ICM bay 1 is routed to the secondary
(redundant) I/O adapter. In a nonredundant storage fabric configuration, the secondary connection would
not be active. Likewise, a SAS connection module ICM bay 4 will offer to connect to the primary I/O
adapter of a storage module any place in device bays 7-12, but will not access the primary I/O adapter in
Bays 1-6. If redundancy is not configured if the SAS fabric, it is required that connection modules in ICM 1
will only support storage modules in device bays 1-6 and connection modules in ICM 4 will only support
storage modules in device bays 7-12.
Planning 13