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Class of Service and Accounting Code information. In addition, the chgrp, chmod, and chown
commands are supported as quote site options.
The FTP daemon is built on top of the Client API and must be run on a node that supports Kerberos
clients. Note that FTP clients can run on computers that do not have Kerberos installed.
The size of the buffer, used for reading and writing HPSS files, can be specified in the FTP daemon
configuration. The buffer size selected can have a considerable impact on both system performance
and the amount of metadata generated when writing directly to a tape Storage Class. See Section
3.9.6: Location Policy on page 99 and Section 3.11: HPSS Performance Considerations on page 112
for further information.
The GSSFTP from MIT is supported if the HPSS FTP Daemon is appropriately configured. This
client provides credential-based authentication and “Cross Realm” authentication to enhance security
and “password-less” FTP features.
Refer to the HPSS User’s Guide for details of the FTP interface.
3.6.3. Parallel FTP
The FTP daemon also supports the HPSS Parallel FTP (PFTP) protocol, which allows the PFTP
client to utilize the HPSS parallel data transfer mechanisms. This provides the capability for the
client to transfer data directly to the HPSS Movers (i.e., bypassing the FTP Daemon), as well as the
capability to stripe data across multiple client data ports (and potentially client nodes). Data transfers
are supported through TCP/IP. Support is also provided for performing partial file transfers.
The FTP protocol is supported by the HPSS FTP Daemon. Refer to Section 13.2: FTP Daemon
Configuration of the HPSS Management Guide for configuration information. No additional
configuration of the FTP Daemon is required to support PFTP clients.
The client side executable for PFTP is pftp_client. pftp_client supports TCP based transfers.
Because the client executable is a superset of standard FTP, standard FTP requests can be issued as
well as the PFTP extensions. Authentication using either username/password or Kerberos credentials
is configurable.
Refer to the HPSS User’s Guide for details of the PFTP interface.
3.6.4. XFS
XFS for Linux is an open source filesystem from SGI based on SGI's XFS filesystem for IRIX.
The impression of an infinitely large XFS filesystem can be achieved by using HPSS as a back end
to XFS. HPSS transparently archives inactive XFS data into HPSS storage which frees up XFS disk
space for active data.
It is well suited to sites with large numbers of small files or clients who wish to use NFS to access
HPSS data. However, the files can only be accessed through XFS (or NFS via XFS) and cannot be
accessed with HPSS utilities such as parallel FTP.
3.7. HPSS Server Considerations
Servers are the internal components of HPSS that provide the system's functionality. They must be
configured correctly to ensure that HPSS operates properly. This section outlines key considerations
that should be kept in mind when planning the server configuration for an HPSS system.
HPSS Installation Guide July 2008
Release 6.2 (Revision 2.0) 80