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Glossary
Distribute and Activate ➟ DNA
Distributed Tape Volume File System ➟ DTVFS
DNA
The Distribute and Activate (DNA) function must be invoked in GXCC every time a
change is made to the configuration of the CentricStor system. This ensures that the
new configuration is distributed to and activated on all the ISPs.
➟ section “Distribute and Activate” on page 188
DTVFS
DTVFS (Distributed Tape Volume File System) is a file system implementation which
was developed specially for CentricStor which has been adapted to the requirements of
high concurrence and of high-speed data traffic both between the TVC (Tape Volume
Cache) and hosts and between the TVC and tape drives. In CentricStor V3.1D, all Tape
File Systems (TFSs) of the TVC are of the type dtvfs.
Emulation
An emulation is a functional simulation of one system by another. The emulated system
receives the same data, executes the same programs and achieves the same results
as the original system.
Example: A logical drive (LD) emulates a physical drive (PD).
Extented Tape Control Center➟ XTCC
Failover ➟ AutoVLP failover function
FC
Fibre Channel (FC) is a standard which was designed for serial and continuous high-
speed transfer of large volumes of data. It is also used in the Storage Area Network (SAN)
within CentricStor and in some cases for the connections between the ICPs and the
hosts and between the IDPs and the back-end devices. The FC controllers used in
CentricStor support bandwidths of between 1 Gb/s (Gigabit per second) and 4 Gb/s.
In the case of a Fibre Channel, each device has a WWNN (World Wide Node Name)
and each port of a device a WWPN (World Wide Port Name) as a unique worldwide
identifier. Each of these is a 64-bit address which is generally presented in hexadecimal
format as 8 bytes separated by colons.
A distinction is made between three types of Fibre Channel topologies :
– Switched Fabric (FC-SW)
In the case of the Fibre Channel Switched Fabric, point-to-point connections are
switched between the channel via one or more FC switches.
– Arbitrated Loop ( FC-AL)
In the case of the Fibre Channel Arbitrated Loop a logical bus is involved on which all
terminals share the same bandwidth. In CentricStor, FC-AL can only be used to
connect back-end devices.
– Point-to-Point (FC-P2P)
This refers to a direct connection between two terminals.