Planning
Performance
Measuring I/O performance is done from the host operating system. Some tools that measure I/O performance include the
following:
• Windows—PerfMon
• Linux—
sar
command from
systat
.
• VMware—vSphere Client disk
Load balancing
When using a dual domain SAS topology, Smart Array has two paths that it could use to access each SAS drive. During power-
up, Smart Array selects an optimal path for each drive during power-up, and then the Smart Array distributes half of the drives
to each path. For example, odd bays use path one and even bays use path two.
Dual domain path selection optimizes performance by allowing the controller to use the additional bandwidth available in the
secondary drive path.
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. The HPE Synergy
D3940 Storage Module may be connected to any HPE Smart Array 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 interconnect module bays 1
and 4, and each storage module contains a pair of I/O adapters. This redundancy provides dual paths for each HPE Smart
Array 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 interconnect module 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, interconnect module 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 interconnect module 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 interconnect module 1 will only support storage modules in device bays 1-6 and
connection modules in interconnect module 4 will only support storage modules 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
interconnect module 1 will only support storage modules in device bays 1-6 and connection modules in interconnect module 4
will only support storage modules in device bays 7-12.
This routing does not impede compute module access to a storage module regardless of where the storage module is located.
For example, a compute module in device bay 1 will connect to a storage module in device bay 11, even in a nonredundant
Planning
17
Summary of Contents for Smart Array P416ie-m SR Gen10 Controller
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