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Technical white paper | HP RA for Red Hat Storage Server on HP ProLiant SL4540 Gen8 Server

Switches

Red Hat Storage Server clusters can be connected using 1Gb Ethernet or 10Gb Ethernet ports. In our testing, we used an HP

5920 series switch (Figure 6) to cluster nodes via 10Gb Ethernet for fast performance.

Top of Rack (ToR) switches (5920AF-24XG Switch)

The HP 5920AF-24XG 10GbE high-density, ultra-deep packet buffering, top-of-rack (ToR) switch provides IRF Bonding and

sFlow which simplifies the management, monitoring and resiliency of a Red Hat Storage Server network. This model has 24

x 10-Gigabit / Gigabit SFP+ ports for ultra-high capacity connections. The high performance 10GbE networking provides cut-

through and nonblocking architecture that delivers industry-leading low latency (~1.7 microsecond) for very demanding

enterprise applications; the switch delivers a 480Gbps switching capacity and 357.12 Mpps packet forwarding rate in

addition to incorporating 3.6GB of packet buffers.

For more information on the HP 5920AF-24XG switch, please see hp.com/networking/5920.

The configuration for the HP 5920AF-24XG switch is provided below. The HP 5920 switch can also be used for connecting

the SL4540 Shared Network Port LOM iLOs from the individual servers. (Direct connection of the iLO port on the SL4540 to

the 5920 will not work, because the 5920 ports will not support 100Mbs.) This will require an HP X120 1G SFP RJ45 T

Transceiver (JD089B) (1GbE transceiver) to be installed in the 5920 switch for each server. This connectivity option will also

require that the iLO configuration on the servers be changed to utilize NIC 1, 1GbE port on the SL4540 server node (up to 3

per chassis), instead of the iLO module connector located in the SL4540 chassis. For additional information on how to

configure the iLOs go to hp.com/go/ilo. Another option for iLO connectivity is to add an HP 5120 El switch and connect the

iLO connectors from each chassis to that switch.

Note

For customers expecting a complete physical isolation between the iLO traffic from the servers as well as the management

traffic, for their switches using the Out of Band interface (dedicated RJ-45 port), HP recommends to build a separate “out

of band” network. By building this separate network, all the management traffic follows a completely different path which

will never be impacted by any action executed on the data traffic coming from the servers (applications). A switch like the

5120 EI can be used for this type of “out of band network”, with 10/100/1000 RJ-45 connectivity (48 ports: JE069A or

24 ports: JE066A) to connect iLO ports.

Figure 6. HP 5920AF-24XG Top of Rack (ToR) switch

Capacity and sizing

One of the principal virtues of scale-out storage is that it can be scaled easily in multiple dimensions. In this solution, the

flexibility of the HP ProLiant SL4540 Gen8 platform as well as that of Red Hat Storage Server makes multi-dimensional

scalability a reality. In general, sizing constraints will be dictated by both the initial size of the data to be stored, as well as

expectations for anticipated growth.

Workload description

To evaluate performance of the joint Red Hat and HP solution, testing was performed using a pair of two-node HP ProLiant

SL4540 Gen8 servers along with four clients. Testing was conducted using IOzone—a filesystem benchmark tool that

generates and measures a variety of file operations. IOzone is useful for performing a broad filesystem analysis of a

particular platform and can characterize file system I/O based on a number of distinct operations.

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