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updates made through the DFS interface being visible through the HPSS interface and vice versa.
Filesets managed with this option are called mirrored filesets. Objects in mirrored filesets have
corresponding entries in both DFS and HPSS with identical names and attributes. A user may
access data through DFS, at standard DFS rates, or when high performance I/O rates are important,
use the HPSS interface.
7.6.2.3
Architectural Overview
To interface DFS with HPSS, modifications to both DFS and HPSS were required. The architecture
used to integrate HPSS with the Episode file system is shown in Figure 7-1. The architecture to
integrate HPSS with XFS is very similar. It is actually identical insofar as HPSS components are
concerned; however, the 'DFS SMT', 'DFS File Server', 'DFS Client', and 'Episode' components in
Figure 7-1 would be replaced with a single entity, 'XFS File System'.A brief description of the
modifications and new components are discussed in the following sections.
HPSS Installation Guide
Release 4.5, Revision 2
Chapter 7
September 2002
HPSS User Interface Configuration
437
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