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
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 |
