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Chapter 6 HPSS Configuration
HPSS Installation Guide September 2002 383
Release 4.5, Revision 2
Advice: The Same Job on Controller, Other Job on Controller, and Distance to Drive values are used by the PVR
when selecting a drive for a tape mount operation. The three values are essentially weights that are used to compute
an overall score for each possible drive. After the score has been calculated, the drive with the lowest score is selected
for the mount. If two or more drives tie for the lowest score, one drive is selected at random. The score is calculated
as follows:
Score =
Weight 1 * Cartridges from this job mounted on this drive’s controller +
Weight 2 * Cartridges from other jobs mounted on this drive’s controller +
Weight 3 * Units of distance from the cartridge to the drive
This method has the effect of distributing a striped tape mount across as many controllers as possible for the best
performance. It also will try to pick controllers that are currently driving a minimum number of tapes. So, in an
environment with many tape drives per controller, the best performance will be achieved by minimizing the load on
any one controller.
Shelf Tape Check-In Retry The number of seconds the
PVR will wait before
asking the robot if a
requested shelf tape has
been checked-in. The PVR
will continue checking at
this interval until the tape
is checked-in. This field is
only active if the Support
Shelf Tape button is
checked
Any positive 32-bit integer value 30 seconds
Shelf Tape Check-In Alarm The PVR will periodically
log alarm messages when
a requested shelf tape has
not been checked-in. This
field specifies the number
of minutes between
alarms. This field is only
active if the Support Shelf
Tape button is checked.
Any positive 32-bit integer value 10 minutes
Dismount Delay The number of minutes
that dismounts are delayed
after the last data access.
This field is only active if
the Defer Dismounts
button is checked.
Any positive 32-bit integer value 15 minutes
Table 6-31 Physical Volume Repository Configuration Variables (Continued)
Display Field Name Description Acceptable Values
Default
Value