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Eugen Betke
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\usepackage{todonotes}
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\newcommand{\jk}[1]{\todo[inline]{JK: #1}}
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\newcommand{\eb}[1]{\todo[inline]{EB: #1}}
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\usepackage{changes}
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@ -163,7 +165,7 @@ While providing many interfaces, the XPD does not offer a shared storage that ca
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DDN provided access to their test cluster in D\"usseldorf on which 10 nodes could be used for testing.
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Each node is equipped with two Sandy Bridge processors (8 cores, E5-2650v2 @2.60GHz) and 64~GB RAM.
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They are interconnected with a Mellanox Connect-X-4 card providing 100 Gb/sec (4x EDR).
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As storage, a DDN ES14K (Exascale 3.1) with two metadata servers and Lustre 2.7.19.12 is provided; additionally, an IME system consisting of 4 servers is provided.
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As storage, a DDN ES14K (Exascale 3.1) with two metadata servers and Lustre \ebr{2.10.5}{2.7.19.12} is provided; additionally, an IME system consisting of 4 servers is provided.
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The flash native data cache of IME acts as a burst buffer and is drained to the Lustre system, the performance reported with IOR is 85~GB/s in write mode.
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The DDN IME provides byte-addressable flash-based storage space with high performance characteristics.
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It can be addressed directly (IME-native) in a fast and efficient way, but DDN also provides a number of convenient solutions, that require less integration effort.
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The goal of our evaluation is to systematically investigate the scaling behavior of the DDN IME's, IME-FUSE and Lustre.
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In the following experiments we use 1-10 client nodes (NN) and 1-8 processes per node (PPN) to push hardware to the limits.
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On each compute node only one CPU is used, that is connected directly to the Infiniband adapter, to avoid the QPI overhead.
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On each compute node only one CPU is used, that is connected directly to the Infiniband adapter, to avoid the UPI overhead.
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To provide reliable results, each experiment was repeated 10 times.
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%\jk{Wie oft wurden die Experimente wiederholt steht nirgendwo?}
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\subsection{Application Kernel Using HDF5}
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\eb{Rerun NetCDF with larger files. NetCDF-Bench requires a stonewalling feature, like IOR. This would make benchmark runtime more predictable.}
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\eb{Compilation of NetCDF with DDN-IME support.}
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In this experiment, the HDF5 VOL development branch (date 2016-05-09), NetCDF~4.4.1 and NetCDF-bench is used.
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%Several values for the 4D data geometry (($100$:$16$:$64$:$4$) $\approx$ 3.1MiB, ($100$:$16$:$64$:$25$) $\approx$ 19.5iB, ($100$:$16$:$64$:$256$) $\approx$ 200MiB, ($100$:$16$:$64$:$2560$) $\approx$ 2000MiB) of raw integer data have been explored.
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Several values for the 4D data geometry of raw integer data have been explored.
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