Home > Workload Solutions > High Performance Computing > White Papers > Dell Validated Design for HPC NG-Stor Storage - Joint Solution with Kalray > PowerEdge R660
In this release, we added an extra test, which has been gaining importance for some workloads, particularly as it is needed for some AI storage certifications (such as NVIDIA SuperPOD Storage).
The main difference from the previous test is that instead of using eight 15G servers with NDR200, we used one of the PowerEdge R760 NVMe servers with two NDR adapters as the single client, but with enough network bandwidth for almost 100 GB/s (avoiding that bottleneck).
The following commands were used to run the benchmark for read and write operations, where the Threads variable is the number of threads used (1 to 1024 incremented in powers of 2), all running from the same client. The FileSize variable has the result of 8192 (GiB)/threads to divide the total data size evenly among all threads used. A transfer size of 16 MiB was used for this performance characterization.
./iozone -i0 -c -e -w -r 16M -s ${FileSize}G -t $Threads -+n
./iozone -i1 -c -e -w -r 16M -s ${FileSize}G -t $Threads -+n
Figure 14. Single client to N files Sequential Performance
Read performance reached a peak at 63.1 GB/s at 64 threads and then a plateau of approximately 60 GB/s. The value at 1024 drops from the plateau. Possible causes include:
More investigation is needed to determine the actual cause.
Write performance reaches a plateau of about 40 GB/s at 32 threads, and a peak of 43.5 GB/s at 512 threads. At 1024 threads, the performance drops even faster than read performance. Possible causes are the same as for read performance, along with the replication used for writes. More investigation is needed to determine the actual cause.
These performance numbers show that a single NG-Stor NVMe pair meets the single node read and write requirements for SuperPOD Best storage performance. The previous N-N test also shows that a single NVMe pair can meet the single SU aggregate system for read and write requirements for SuperPOD Best storage performance. A simple extrapolation of the results from the N-N test shows that four NVMe pairs are needed to meet the four SU aggregate system read and write requirements for SuperPOD Best storage performance.