PnetCDF error on cluster

[o_Orz]

Hi:
    I runned WRF program on ARM HPC cluster. In the cluster, all nodes share working directory by NFS.
    While using netcdf, I found everything fine except that the performance was poor.
    So I used PnetCDF. On single node, it functioned well. But when it is used in cluster, the netcdf file it generated is wrong and unreadable. I cannot figure oit why. Is it that PnetCDF does not support multi-node application? Is it that I didn't use distribute file system? Or some other reason?

Best Regards
Xie Bin
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