Hub/Switch Installation Guide

Chapter 2 HPSS Planning
112 September 2002 HPSS Installation Guide
Release 4.5, Revision 2
Server. However, that would leave no space forany symboliclinks, hard links,or growth. To cover
these needs, the total number of SFS records might be rounded up to 1,500,000.
If morename space is needed, additionalspace can be obtained byallocating more SFSrecords,by
adding more storagesubsystems, and/or by “attaching” to a NameServer in another HPSS. Refer
to Section 10.7.3: Name Server Space Shortage on page 272 in the HPSS Management Guide for
information on handling an Name Server space shortage.
Access ControlList Extensions. Thismetadatafile isused tostoreoverflow objectACL entriesand
to store any Initial Container or Initial Object ACL entries. An object with more than four object
ACLentries (inaddition tothestandarduser_obj,group_obj,andother_objentries) willhave one
ormoreACL recordsintheACL overflowfile. Each oftheseACL extensionrecordscan contain up
to 16 additional ACL entries. Any directory object that has Initial Container or Initial Object ACL
entries will have one or more ACL records in the ACL overflow file. Sites that anticipate using a
large number of ACLs of any type should ensure that sufficient SFS space is available for the ACL
overflow file.
Text Extensions. A name space object whose name is greater than 23 characters or that has a
comment will createrecords in the text overflow (or extensions) file. In addition, thesymbolic link
data of all symbolic link objects is placed in the text overflow file. These text records are variable
length with a maximum size of 1023 bytes. Sites that anticipate using comments, symbolic links
and/or long names should ensure that sufficient SFS space is available to accommodate these text
overflow entries.
Fileset Attributes. This metadata file is used to hold fileset information about a particular fileset.
When fileset objects are created, there is insufficient room in the object file record to hold all of the
neededinformation. Thisadditionalinformationis putinto arecordin thisfile.So, thereis arecord
in this file for each fileset managed by this Name Server.
Global Filesets. This file is shared by all Name Servers running in a particular DCE cell. If more
thanoneHPSSisrunninginaDCEcellorthereismorethanonestoragesubsystemwithinanHPSS
system, each Name Server should share this file. The Global Filesets file is used to guarantee the
uniquenessof filesetnames andfileset identificationnumbers, andto identifywhich NameServers
and which DMAP Gateways manage which fileset.
2.10.2.5 Bitfile Server Metadata
The Bitfile Server is the primary user of the following SFS metadata files (thedefault SFSfilenames
are shown in parentheses):
• Storage Classes (storageclass)
• Hierarchies (hierarchy)
• Classes of Service (cos)
• Bitfiles (bitfile.#)
• Bitfile Disk Segments (bfdisksegment.#)
• Bitfile Disk Allocation Maps (bfdiskallocrec.#)