Evaluation of GPFS Connectivity Over High-Performance Networks Page: 3 of 13
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achieve about 6GB/sec, and it should be noted that this bandwidth will be shared by the
multiple systems that will access NGF.
For some of the evaluation done for this paper, we also used another filesystem
that was setup similarly to NGF, except that it had a lower bandwidth of approximately
2GB/sec.
NE RSC
10GE
Network
NSD Server Nodes
Fibre-
Channel
Fabric
Fig. 2 Schematic of the Nersc Global Filesystem Configuration
There are two main ways to connect to NGF (or, more generally, any GPFS filesystem)
and we list them below:
a. All GPFS filesystem instances (also called "clusters" in GPFS terminology) are
accessible to other remote GPFS clusters over the Ethernet - although it is
recommended that either 1Gbps or 10Gbps connectivity be used.
b. We can directly access the disks that comprise the filesystem - in this case, the
storage is F/C attached storage, so we can directly connect to the F/C fabric that
connects the storage. This is called SAN-mode connectivity in GPFS terminology.
Additionally, both methods of connectivity can co-exist between GPFS clusters, and
GPFS can be configured to either use one method or the other or always use only one of
the methods available. Typically, SAN-mode provides better performance access to a
GPFS filesystem, although the performance itself will depend on the details of how the
connections are made (how much of the bandwidth is shared, the F/C configuration,
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Srinivasan, Jay; Canon, Shane & Andrews, Matthew. Evaluation of GPFS Connectivity Over High-Performance Networks, report, February 17, 2009; Berkeley, California. (https://digital.library.unt.edu/ark:/67531/metadc930705/m1/3/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.