Computer Drive User Manual

Global Database Name. The name of the global database for the HPSS system.
Subsystem Database Name. The name of the database which contains the subsystem tables used by this
Core Server.
Schema Name. The name of the database schema.
Root Fileset Name. The name of the root fileset used by the Core Server.
Root Fileset ID. The fileset id for the root fileset used by the Core Server.
Maximum Open Bitfiles. The maximum number of bitfiles that can be open simultaneously.
Maximum Active I/O Reqs. The maximum number of simultaneous I/O requests allowed.
Maximum Active Copy Reqs. The maximum number of simultaneous copy requests allowed.
COS Change Stream Count. Indicates the number of background COS change threads to run in the
Core Server. The default is 1.
COS Change Retry Limit. Limits the number of times that the Core Server will retry a failed COS
change operation. When this limit is reached, the attempt to change the COS of the file is terminated.
Tape Dismount Delay (seconds). The amount of time, in seconds, a mounted tape volume will remain
idle before being dismounted by the Core Server. Larger values may reduce undesirable tape
dismount/remount events, at the expense of lower tape drive utilization.
Tape Handoff Delay (seconds). The amount of time, in seconds, a mounted tape will be held in a
client's session before become eligible to be handed off to another client that wishes to use the tape.
PVL Max Connection Wait (seconds). The amount of time, in seconds, the Core Server will wait to
connect to the PVL before declaring an error in pending PVL jobs.
Fragment Trim Limit (clusters). Fragment Trim Limit sets the lower limit of the number of clusters
that will be trimmed from a disk segment extent, when the extent turns out to be longer than the needed
length.
Fragment Smallest Block. Fragment Smallest Block sets the boundary used to determine where to
remove excess clusters from allocations that have excess space. The smallest block returned to the free
space map from the excess space at the end of an extent will be this size or larger.
Root User ID. The numerical id for the root user used by the Core Server.
Root is Superuser. If this flag is ON, clients using the Root User ID will have superuser powers and
permissions.
Subsystem Statistics:
• Stages. The number of stage requests processed in the Core Server since startup or last reset of the
statistics.
• Migrations. The number of migrate requests processed in the Core Server since startup or last
reset of the statistics.
• Purges. The number of purge requests processed in the Core Server since startup or last reset of
the statistics.
HPSS Management Guide November 2009
Release 7.3 (Revision 1.0) 128