Hub/Switch Installation Guide

Chapter 2 HPSS Planning
HPSS Installation Guide September 2002 63
Release 4.5, Revision 2
2.6.2 Bitfile Server
The Bitfile Server (BFS) provides a view of HPSS as a collection of files. It provides access to these
files and maps the logical file storage into underlying storage objects in the Storage Servers. When
a BFS is configured, it is assigned a serverID. Thisvalue shouldnever bechanged. It is embedded
in the identifier that is used to name bitfiles in the BFS. This value can be used to link the bitfile to
the Bitfile Server that manages the bitfile.
The BFS maps bitfiles to their underlying physical storage by maintaining mapping information
thattiesabitfiletothestorageserverstoragesegmentsthatcontainitsdata.Thesestoragesegments
arereferencedusingan identifier thatcontains theserverIDof theStorageServer thatmanagesthe
storage segment. Forthis reason, once aStorage Server has been assigned a serverID, this ID must
neverchange.Foradditionalinformationonthispoint,seeSection2.6.3:DiskStorageServeronpage
64 and Section 2.6.4: Tape Storage Server on page 64. The relationship of BFS bitfiles to SS storage
segments and other structures is shown in Figure 2-1 on page 63.
Figure 2-1 The Relationship of Various Server Data Structures