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Files can be transferred between HPSS and remote sites via the standard internet protocol ftp, however, being non-parallel the performance of ftp will probably not be as good as other methods such as gridFTP.  Note that on NERSC systems ftp translates to pftp so it is in fact parallel.  There is no sftp (secure ftp) or scp access.

As standard ftp clients only support authentication via the transmission of unencrypted passwords, which NERSC does not permit, special procedures must be used with ftp on remote sites, see HPSS Passwords