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The mount options rsize and wsize specify the size of the data block size in bytes to be transferred at one time between the client and server. Setting a larger data block size would improve the performance. But be careful when changing these values; some older Linux kernels and network cards do not work well with larger block sizes. For most of modern systems, these settings are negotiated during mount and the server will specify the recommended settings. By default in OneFS, a rsize of 128 KB and wsize of 512 KB are advertised for NFSv3 Linux clients, but can be set as high as 1 MB. NFSv4.x defaults to 1 MB for both rsize and wsize.
NFS client uses the largest supported size by default. Setting the value too small on a client overrides the default value and can undermine performance.
For EDA workloads, the recommendation is to avoid explicitly setting NFS rsize or wsize parameters on NFS clients when mounting NFS exports directly or using the automounter. Instead, for NFSv3 clients, use the following mount parameters, either directly or in the Automounter map:
nfs rw,vers=3,tcp,hard,intr,retry=2,retrans=5,timeo=600