Fujitsu Siemens Computers pmn User Manual page 34

Software architecture
VLM (Virtual Library Manager)
Each robot job from the requesting host system is registered in the VLM. To support the
libraries, corresponding emulations (VLMF, VAMU, VACS, VDAS, VJUK) are used in
CentricStor.
The TVC is administered exclusively by the VLM.
The VLM data maintenance contains the names of the logical volumes with which the TVC
is to work.
PLM (Physical Library Manager)
The PLM coordinates all jobs issued to the connected peripherals (robot drives). The PLM's
data maintenance facility stores information about where and on which physical volume
each logical volume is stored.
VLS (Virtual Library Service)
There may be various different instances of the VLS, depending on the type and number of
connected host systems:
Host connection
BS2000/OSD, z/OS and OS/390
Open Systems Server (UNIX, Windows)
CSC Clients of BS2000/OSD
Open Systems Server (UNIX, Windows) with ACSLS
LIB/SP Clients from Fujitsu
Open Systems Clients, UNIX and Windows
PLS (Physical Library Service)
The PLS is the link between CentricStor and the robot archive. Jobs to the robots, e.g.
moving a tape cartridge in the robot archive, are issued at the behest of the PLM.
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CentricStor - Virtual Tape Library
Instance Library
VAMU ADIC
VDAS
VACS StorageTek
VLMF Fujitsu
VJUK SCSI
U41117-J-Z125-7-76