online replacement
Glossary-6
online replacement
Replacement or service of a module while the library remains operational. The service
person may be required to power off the module before removing or replacing it.
operator panel
See touch screen operator control panel.
orphaned cartridge
A cartridge in a partitioned library that is located in an unallocated slot or drive (that
is, a slot or drive not allocated to any defined partition). Cartridges may become
orphaned when partition boundaries are changed, partitions are deleted, or cartridges
are manually moved to unallocated or inaccessible slots.
PDU
See power distribution unit (PDU).
PLI
See primary library interface (PLI).
PTP
See pass-thru port (PTP).
pass-thru port (PTP)
An electro-mechanical device that allow one library storage module to pass a cartridge
to another adjacent library storage module in the same complex. A library complex is a
series of libraries connected with pass-thru ports. SL8500 libraries are joined together
by four PTPs because there are four rails. See also home libraryand away library.
physical audit
Physical audits occur when the robots:
■ Scan the cartridge locations in the library
■ Verify the vol u m e s
■ Update the library control card inventory
■ Set the status of the cartridge location to true
physical capacity
The number of storage slots in the library. Compare to active capacity.
power distribution unit (PDU)
A device for the distribution of AC line power from one inlet to multiple outlets.
Multiple PDUs provide higher availability because the power continues if one PDU (or
its alternating current source if the PDUs use separate AC sources) loses power.
primary library interface (PLI)
The communication path between the operator panel and the library controller.
purchased capacity
The total number of storage slots authorized for activation. The value is defined by the
hardware activation file. See also allocated capacity and active capacity.
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