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Glossary
System Administrator Edition ➟ SAE
Tape File System ➟ TFS
Tapemark
A tapemark identifies the end of a header or logical volume (LV ) on a physical tape.
Tape Volume Cache ➟ TVC
TFS
In CentricStor V3.1D a Tape File System (TFS) is a file system of the type dtvfs (DTVFS)
in which the logical volumes (LV s) are stored temporarily. The Tape File Systems as a
whole constitute the Tap e Volume Cache (TVC). In CentricStor the Tape File Systems are
tied to a permanent naming schema: /cache/1nn, where nn stands for 00, 01, 02 etc.
When the Cache Mirroring Feature (CMF) is used, each Tape File System is mirrored.
The mirrored Tape File Systems are then called /cache/2nn.
TVC
The TVC (Tape Volume Cache) is the core of the entire virtual archiving system. It
represents the Tape File Systems as a whole in which the logical volumes are stored
temporarily. One or more RAID systems (up to 8) are used for this purpose.
➟ section “RAID systems for the Tape Volume Cache” on page 30
Virtual Library Manager ➟ VLM
Virtual Library Processor ➟ VLP
Virtual Library Service ➟ VLS
Virtual Tape Appliance ➟ VTA
Virtual Tape Controller ➟ VTC
Virtuelles Archivsystem ➟ TVC
VLM
Each robot request of the requesting host system is registered in the VLM. The requisite
emulations (VLMF, VAMU, VACS, VDAS, VJUK) are used in CentricStor to support the
libraries.
The TVC is always accessed via the VLM.
VLP
The VLP is the central ISP in the larger CentricStor models from VTA 1500. The central
management processes run on this, in particular the VLM and the PLM.
A failure of the VLP causes the entire CentricStor system to crash. To prevent this, a
standby computer can optionally be integrated into the CentricStor as a Standby VLP
(SVLP
), and this takes over the tasks of the VLP Master if this should crash.
The predefined host names for this ISP type are VLP0 and VLP1.
➟ section “VLP (Virtual Library Processor)” on page 27
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