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

• IOZONE_RECORDSZ was varied between 64KB and 4MB, considering record sizes that were powers of two. This range of

record sizes was meant to characterize the effect of record/block size (in client file requests) on I/O performance.

• TEST_THREADS specifies the number of threads or processes that are active during the measurement.

Workload results

Both distributed volumes and two-way replicated volumes were evaluated as a part of the testing. Both were tested for

throughput as well as sequential and random reads and writes.

Test results—distributed volumes

Figure 9 illustrates the effect of record size (kiloBytes) variation, as defined by the IOzone record size variable, on RHS

Distributed volume throughput (in MB/second). There are 4 clients with 8 threads each totaling 32 client threads targeting a

4-node Red Hat Storage Server cluster in a distribute volume configuration. The sequential read and sequential write

saturate at record size greater than 64KB, and the random read and write scale over all reasonable record sizes.

Figure 9. The effect of request size on throughput for a distributed volume

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