Chapter 3 System Preparation164 September 2002 HPSS Installation GuideRelease 4.5, Revision 2Note: All PFTP Client SubStanzas are optional.The PFTP Client = { … } stanza contains several optional specifications for the pftp_client and/orkrb5_gss_pftp_client executables.The DEFAULT COS = value substanza assigns a default Class of Service (COS) for HPSS. If thisoption is not specified, the Bitfile Server is responsible for determining the default COS unless theuser explicitly issues a “site setcos ” command or specifies “-C“ on the commandline to change the class of service. If this substanza is specified, the class of service provided invalue will be used unless the user explicitly issues a “site setcos ” command to changethe class of service. For this reason, caution should be used in specifying this option.The Protocol = value substanza is used to specify the desired PFTP protocol. Currently, either oftwo values may be specified: PDATA_AND_MOVER or PDATA_ONLY. The default specificationis PDATA_AND_MOVER. The PDATA_ONLY specification provides improved performance inhigh latency WAN environments.PFTP processes perform automatic conversion of get and put commands to their parallelequivalents, pget and pput. Some sites have reported degraded performance as a result of thissubstitution occurring with small file transfers. To accommodate this problem, the Auto ParallelSize = value substanza may be specified in the HPSS.conf file where the “automatic” parallelfeatures will not be invoked if the size of the file is less than the value provided. The value may bespecified as a decimal number (1048576) or in the format: xMB.For sites with “Firewalls/ Diodes” installed, it may be necessary to provide specific ports for thedata to move between the PFTP Client and the Mover(s). This can be accomplished by specifyingthe PortRange = value substanza. The syntax of this statement is:PortRange = ncadg_ip_udp[10100-12100]:ncadg_ip_tcp[10100-12100]SubStanza Transfer Buffer Size = E.g. Transfer Buffer Size = 16MBOptional SubStanza specifying the PFTP Buffer sizes.May be specified as a decimal number or “xMB” style notation.SubStanza Socket Buffer Size = E.g. Socket Buffer Size = 16MBOptional SubStanza specifying the Pdata Socket Buffer sizes.May be specified as a decimal number or “xMB” style notation.SubStanza MAX Ptran Size = E.g. MAX Ptran Size = 4GBOptional SubStanza specifying a larger transfer size betweensocketopen and closure. For disk COSs, the segment sizes maypotentiallyoverride this specification! May be specified as a decimalnumberor “xMB” style notation.Table 3-2 PFTP Client Stanza Fields
