IBM Hub/Switch Installation Manual page 165

This syntax is identical to DCE's RPC_RESTRICTED_PORTS environment variable. Only the
ncacn_ip_tcp[start_port-end_port] (TCP component) is used so the ncadg_ip_udp component
may be omitted.
Additional options are available for controlling the size of the PFTP transfer buffers, Transfer
Buffer Size, and the buffer size for the sockets in the PDATA_ONLY protocol, Socket Buffer Size.
The value may be specified as a decimal number (1048576) or in the format: xMB.
The PFTP parallel protocol opens and closes the sockets between the PFTP Client child processes
and the Mover(s). The default value for tape was every 512 MB and for disk was the smaller of the
size of 64 storage segments or 512 MB. With transfers increasing in performance into the 100MB/
sec and greater range, the opening and closing of sockets is another performance problem. The
MAX Ptran Size = value substanza has been provided to allow for larger transfers between socket
open and closing.
NOTE: in the case of disks, the 64 storage segments is still the overriding specification, so Storage
Classes need careful specification to provide very large segments if the value associated with MAX
Ptran Size is large. An artificial limit of 250 GB is compiled into the PFTP Client, which should not
cause a great concern any time in the near future. Even at 1 GB/sec, this is several minutes! The
value may be specified as a decimal number (4294967296) or in the format: xGB.
PFTP Client Stanza Example:
PFTP Client = {
;
DEFAULT COS = 2
;
Protocol = PDATA_AND_MOVER
;
;
Auto Parallel Size = 4MB
;
;
;
PortRange = ncadg_ip_udp[10100-12100]:ncadg_ip_tcp[10100-12100]
;
Transfer Buffer Size = 1MB
Socket Buffer Size = 16MB
;
MAX Ptran Size = 10GB
}
3.7.1.2 PFTP Client Interfaces Stanza
Many systems have multiple interfaces, some of which may not have access to all destination hosts.
The PFTP Client Interfaces stanza is used to specify which interfaces on the source host should be
used to communicate to destination Parallel FTP Daemons and/or HPSS Movers. This is
HPSS Installation Guide
Release 4.5, Revision 2
Set Default Class of Service
Set Default Protocol
Set Minimum File Size for auto mapping Non-parallel
commands to Parallel commands
Set the Port Range for Port Restrictions on Parallel Transfers
Only the port range for ncacn_ip_tcp is parsed.
The syntax has been taken from DCE.
PDATA Options
PFTP sets an Artificial (Compiled in) Maximum of 250GB
September 2002
Chapter 3 System Preparation
165