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The gpfs servers have access all pools but files that are on a non-local pool have to be read over the network (Ethernet). For example on fermi-gpfs01 accessing files that are stored on dpool1 will be read from fermi-gpfs05/06. In this case monitoring will show outgoing traffic for fermi-gpfs05/06 and incoming traffic for fermi-gpfs01. In order to find the pool for a file run the command:
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% /usr/lpp/mmfs/bin/mmlsattr -L <file-name> |
The throughput for reading from a remote pool was tested by reading 5 large files (~30GB per file) in parallel on a gpfs server and the files are on a remote pool:
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