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The other notable options are configured underneath the storage and connectivity specifications, as shown in the preceding figure (Figure 3). The f900 share will use 16 I/O threads in Baselight. The thread option is indicated with the limit f900 threads=16 line. Those threads are the number of I/O threads that Baselight will use for the volume named f900 in this example. This option holds for TCP or RDMA-based connections.
The threads setting here is distinct from the nconnect. Nconnect specifies the number of TCP channels that the operating system uses when connecting to a server with TCP. With multiple channels, the client can have more NFS requests in-flight simultaneously, increasing throughput.
The next setting tells Baselight to use Direct IO for writes only on the volume named f900.
limit <volume name> directio=write
In our testing, increasing the thread count to 16 and enabling Direct IO only for writes proved to be the best options for Baselight performance when it was reading from PowerScale OneFS.