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

Figure 18 illustrates the effect of scaling out both the number of Red Hat Storage Server nodes (in a distributed-replicated

configuration) and clients on random writes. The test used a record size of 1024KB. The 4-node configuration shows double

the random write throughput than a 2-node configuration. In case of both the 2-node and 4-node configuration, increasing

the number of client threads does not increase the random write throughput.

Figure 18. Random write scalability in a 2-way replicated volume

Analysis and recommendations

Scale-out storage using Red Hat Storage Server and HP ProLiant SL4540 Gen8 servers yields useful multi-dimensional

scalability. Servers can be configured to ideally serve specific workloads and appropriate numbers of servers can then be

deployed to match capacity needs. This building-block approach is particularly useful and allows organizations to scale

storage infrastructure without arbitrary architectural limitations found in many competing solutions.

In general, scale-out storage deployments can be thought of as falling into small, medium, and large categories as

described below. It is important to note that these are not fixed categories and any Red Hat Storage Server configuration

can grow easily on demand.

• Small configurations typically comprise two-to-four HP ProLiant SL4540 Gen8 servers, for four-to-eight compute nodes

and a total raw capacity of 200 to 800TB.

• Medium configurations span 16 to 20 nodes (8-10 two-node HP ProLiant SL4540 Gen8 servers). Depending on disks

chosen, raw capacity can range from 800TB to 2PB.

• Large configurations can easily be built from 40+ nodes (20 or more two-node HP ProLiant SL4540 Gen8 servers), easily

extending scale-out storage to multiple petabytes.

For larger configurations, a fully-configured rack of nine two-node HP ProLiant SL4540 Gen8 servers yields a particularly

attractive hardware (and software) building block. With nine two-node servers, a full rack provides a raw capacity of from

450TB (when configured with 1TB drives) to 1.8PB (with 4TB disk drives). This range is a particularly useful and manageable

size for a Red Hat Storage Server volume. Multiple racks and multiple Red Hat Storage Server volumes can be added as

needed to construct scale-out storage of any size required.

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