Chapter 2 HPSS Planning
HPSS Installation Guide September 2002 121
Release 4.5, Revision 2
2.10.2.20 Metadata Constraints
Thegeneric configurations for all HPSS servers must be contained ina single SFS file. SSM makes
thishappen transparently. Also, all server-specific configuration entries for a given server type can
be in the same SFS file. For example, all Storage Servers should be defined in the single SFS file
namedss. The following metadata files should not be shared between servers; instead, each server
should use a distinct metadata SFS filename:
MPS Checkpoints
PVR Cartridges
SS Disk Storage Maps
SS Tape Storage Maps
SS Disk Storage Segments
SS Tape Storage Segments
SS Disk Physical Volumes
SS Tape Physical Volumes
SS Disk Virtual Volumes
SS Tape Virtual Volumes
2.10.2.21 Metadata Sizing Spreadsheet
To help with projecting disk space requirements for HPSS metadata, an Excel spreadsheet is
available on the HPSS web site at https://www4.clearlake.ibm.com/hpss/support/
ToolsRepository/md43.xls. To access the website, an account is required. To request an
account, use URLhttp://www4.clearlake.ibm.com/cgi-bin/hpss/requests/
id_request.pl. The spreadsheet is divided into two worksheets: the first defines the various
HPSS and SFS sizing assumptions; the second calculates the sizing estimates.

2.10.2.21.1 Metadata Sizing Assumptions

The metadata sizing assumptions are organized into multiple sections: HPSS dynamic variables,
HPSS dynamic variables for each subsystem, HPSS static configuration variables, and SFS sizing
assumptions. Note that all assumptions are with respect to sizing the maximum amount of
metadatarequired to support a planned configuration. It is recommended that sites use values for
multiple years into a project’s future to determine how the metadata sizing requirements will
increase with system growth.
HPSSDynamic Variables. Table 2-5 defines the HPSS dynamic variables associated with the HPSS
systemoutside those specific to a subsystem. These variables will moderately impact the metadata
sizing estimates.