Hpss Filesystems; 1./Opt/Hpss; 2./Var/Hpss - IBM High Performance Storage System HPSS Installation Manual

mirrored log components will need to be determined by HPSS and the customer based on transaction
performance requirements. Potentially, disk resources primarily allocated for HPSS disk cache can
be used or the site may want to dedicate a second disk array for this purpose to prevent any possible
interference.

3.5.3. HPSS Filesystems

The following sections describe the various filesystems used by HPSS.
3.5.3.1. /opt/hpss
The HPSS software is installed in the /opt/hpss directory. The installation package sizes and disk
requirements are listed in Table 10: Installation Package Sizes and Disk Requirements.
3.5.3.2. /var/hpss
See Appendix F: /var/hpss Files for a more detailed explanation of directories and files located in
/var/hpss.
The /var/hpss directory tree is the default location of a number of HPSS configuration files and other
files needed by the servers. It is recommended that this filesystem be at least 1GB in size.
Within the /var/hpss filesystem the following sub-directories exist:
The /var/hpss/etc is the default directory where some additional UNIX configuration files are
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placed. These files are typically very small.
The /var/hpss/ftp is the default directory where several PFTP Daemon files are maintained.
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There are three sub-directories required: adm (contains the hpss_ftpd.log file), daemon, and
daemon/ftpd where the ftp.pids-hpss_class file will be placed.
The /var/hpss/tmp is the default directory where the Startup Daemon creates a lock file for
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each of the HPSS servers it brought up in the node. HPSS may also write diagnostic log files
and disk allocation maps in this directory, when configured to do so. The lock files are very
small, but the logs and disk maps may be several tens of kilobytes, or larger.
It is up to the administrator to remove unneeded reports to prevent the /var/hpss
filesystem from filling.
The /var/hpss/log is the default directory where the Log Daemon creates two central log files.
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The size of these log files is specified in the Log Daemon specific configuration. By default,
these files are 5 MB each. In this same directory, the Log Client will continually write a
circular ASCII log whose size is defined by the specific configuration. By default, the size of
this file is also 5 MB.
If MPS is configured to produce a migration/purge report, it will generate a report every 24
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hours. The size of these reports varies depending on the number of files being migrated and
purged during the report cycle. These reports are placed in the /var/hpss/mps directory by
default and will need to be removed when no longer needed.
It is up to the administrator to remove unneeded reports to prevent the /var/hpss
filesystem from filling.
If the Gatekeeper is configured to do Gatekeeping Services, then the administrator may wish
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HPSS Installation Guide
Release 6.2 (Revision 2.0)
July 2008
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