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Glossary
Message Manager ➟ MSGMGR
MSGMGR
Exists once in CentricStor. Filters and saves the ISPs’ system messages and imple-
ments predefined measures (e.g. service call, sends SMS, etc.). The MSGMGR is also
responsible for forwarding the system messages to the user interface.
PERFLOG
Exists once in each CentricStor. Obtains and stores the performance data. Global
Status supplies the performance data.
Performance Logger ➟ PERFLOG
PD
A Physical Drive is a phsysical tape cartridge drive which is connected to the IDP.
PDS
Software for controlling tape cartridge drives.
Physical Device Server ➟ PDS
Physical Drive ➟ PD
Physical Library Manager ➟ PLM
Physical Library Server ➟ PLS
Physical Volume ➟ PV
Physical Volume Group ➟ PVG
PLM
The PLM coordinates all requests for the peripherals connected (robot systems, tape
drives). The data management of the PLM contains information about where and on
which physical volume (PV) each logical volume (LV) is stored.
PLS
The PLS is the link between CentricStor and the robot archive. Requests to the robots,
e.g. to move a tape cartridge in the robot archive, are issued on behalf of the PLM.
PV
This refers to a real tape cartridge.
PVG
Group of physical volumes for which the same rules apply.
RAID system
A RAID (Redundant Array of Independent Disks) system consists of one or two RAID
controllers and multiple physical hard disks. These are organized as a logical disk drive
which permits a greater storage capacity, greater data security and/or greater
throughput than a single physical disk drive.
The TVC of a CentricStor system uses one to up to eight RAID systems.