System information

Endurance FTvirtual Server Administrator’s Guide Glossary-3
field replaceable unit. See FRU.
FTvirtual Server. The fault-tolerant operating
system environment that runs in lockstep on and is
synchronized between two CoServers. The
FTvirtual Server is where you install and run
applications and also where the majority of the
interaction with the Endurance FTvirtual Server
occurs. When running on a single CoServer, the
FTvirtual Server is degraded but remains
available.
FTvirtual Server boot disk. The mirrored
SCSI disk that the FTvirtual Server uses as its boot
device. It contains the FTvirtual Server’s copy of
Windows and Endurance software. By default, the
boot disk is the mirrored SCSI disk with the lowest
SCSI address among redirected disks.
FTvirtual Server Desktop. A standard
Windows graphical user interface application that
displays FTvirtual Server video output on the local
CoServer.
FRU. Field Replaceable Unit. A Endurance
hardware component that can be replaced on site.
Good. A state that indicates a Endurance
component to which the state applies is fully
usable and operating normally.
immigrant device. A device that was imported
from another Endurance Configuration or a
different CoServer.
input devices. The keyboard and pointer for
your Endurance
Configuration.
interconnect. A physical cable that connects
one CoServer to the other CoServer.
lock step. The method in which the FTvirtual
Server simultaneously executes a duplicated copy
of the Windows operating system and Windows
applications.
MIB. Management Information Base. Includes
the set of all existing data that can be managed in a
network environment. SMI (Structure of
Management Information) is used to describe the
data. See SMI.
minimum downtime upgrade. A hardware
or software upgrade that requires the Endurance
Configuration to be shut down (typically for a few
minutes) and rebooted.
mirror set. The pair of physical SCSI disks (one
in each CoServer) that function as one logical disk.
The disks in a mirror set process and maintain
identical information. If a fault occurs on one of
the physical disks in a mirror set and the disk
cannot be accessed, the Endurance
Configuration
automatically uses the remaining disk in the mirror
set to provide continuous access without losing
data.
mirrored disk. A physical SCSI disk that
resides on the CoServer and stores data for the
Endurance
Configuration, and for which there is a
corresponding disk on the other CoServer. See
mirror set.
mirror set rebuild. The process of bringing the
data on one disk in a mirror set back into
synchronization with the other valid disk in the
mirror set.
Mirror set. Two redirected disks, one in each
CoServer, that contain the same data and appear to
the FTvirtual Server as one disk.