Chapter 6 HPSS ConfigurationHPSS Installation Guide September 2002 383Release 4.5, Revision 2Advice: The Same Job on Controller, Other Job on Controller, and Distance to Drive values are used by the PVRwhen selecting a drive for a tape mount operation. The three values are essentially weights that are used to computean overall score for each possible drive. After the score has been calculated, the drive with the lowest score is selectedfor the mount. If two or more drives tie for the lowest score, one drive is selected at random. The score is calculatedas 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 driveThis method has the effect of distributing a striped tape mount across as many controllers as possible for the bestperformance. It also will try to pick controllers that are currently driving a minimum number of tapes. So, in anenvironment with many tape drives per controller, the best performance will be achieved by minimizing the load onany one controller.Shelf Tape Check-In Retry The number of seconds thePVR will wait beforeasking the robot if arequested shelf tape hasbeen checked-in. The PVRwill continue checking atthis interval until the tapeis checked-in. This field isonly active if the SupportShelf Tape button ischeckedAny positive 32-bit integer value 30 secondsShelf Tape Check-In Alarm The PVR will periodicallylog alarm messages whena requested shelf tape hasnot been checked-in. Thisfield specifies the numberof minutes betweenalarms. This field is onlyactive if the Support ShelfTape button is checked.Any positive 32-bit integer value 10 minutesDismount Delay The number of minutesthat dismounts are delayedafter the last data access.This field is only active ifthe Defer Dismountsbutton is checked.Any positive 32-bit integer value 15 minutesTable 6-31 Physical Volume Repository Configuration Variables (Continued)Display Field Name Description Acceptable Values DefaultValue
