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v Assign an IP address with a different subnet for each individual RDMA-capable
v RDMA-capable Ethernet ports can be used for both node-to-node
v For HyperSwap
The system has the following limitations for systems that use RDMA-capable
Ethernet ports for node-to-node communication:
v Only IPv4 addresses are supported on RDMA-capable Ethernet ports.
v Only the default value of 1500 is supported for maximum transmission unit
v Port masking is not supported on RDMA-capable Ethernet ports. Due to this
v Hot-spare nodes are not supported on systems that use RDMA-capable Ethernet
v Node-to-node communications that use RDMA-capable Ethernet ports are not
v Only certain models of the system support RDMA-capable Ethernet ports for
Powering on the system
After you install all hardware components, you must power on the system and
check its status.
About this task
Attention: Do not power on the system with any open bays or slots. Open bays
or slots disrupt the internal air flow, causing the drives to receive insufficient
cooling.
v Every unused drive bay must be occupied by a filler panel.
v Filler panels must be installed in all empty host interface adapter slots.
Note: The AC power supply unit, and the DC power supply unit in DC-powered
models, features a cable retainer to secure the power cable.
Ethernet port on each node so that the system can select a unique route
depending on the destination IP address that it is connecting to.
communications and host attachment; however, do not share RDMA-capable
Ethernet ports for hosts and node-to-node communications. RDMA-capable
ports are not supported for connections to external storage. A variety of other
protocols are also supported for host attachment and virtualization of external
storage.
®
configurations, ensure that the number of interswitch links is
sufficient for RDMA-capable connections between nodes. Use the peak traffic
that can flow between sites in failure scenarios, such as a single-site failure,
Metro Mirror connections, or volume mirroring between sites to determine the
number of inter-switch links that are required for the system.
(MTU) for node-to-node communications that use RDMA-capable Ethernet ports.
limitation, do not exceed the maximum of four ports for node-to-node
communications.
ports for node-to-node communications.
supported in network configuration that contain more than 2 hops in the fabric
of switches.
node-to-node communications. For a list of the system hardware models that
support RDMA-capable Ethernet ports, see the following website:
http://www-03.ibm.com/systems/support/storage/ssic/interoperability.wss
For other information about using RDMA-capable Ethernet ports on the system,
go to the following website and search for Configuration Limits and
Restrictions:
www.ibm.com/support
Chapter 2. Installing the system hardware
143
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