System information

Glossary-4 Endurance FTvirtual Server Administrator’s Guide
mirroring. A process for creating and
maintaining a set of identical disk images on
separate physical SCSI disks. See mirror set.
non-identical disks. SCSI disks configured as
a mirror set. The disks may be different sizes, and
may also have different model numbers, or be
from different manufacturers.
non-mirrored device. A device in a Endurance
Configuration that does not have a redundant
counterpart, such as a tape drive or a CD-ROM. If
a non-mirrored device is failed out of a Endurance
Configuration, it has no counterpart to provide
continuous device access. A non-mirrored device
cannot be failed out transparently.
Offline. A state that indicates a Endurance
component is present but not in use in the
Configuration. It is possible that the component
may come back online without manual
intervention, depending on the reason for its being
Offline. For specific information on this state as it
applies to particular components, refer to the
Endurance FTvirtual Server Administrator’s
Guide.
Offline Endurance CoServer Mode. The
special operating mode of a Endurance CoServer,
used mostly when making changes to the physical
CoServer components. When using this mode, you
remove one of the CoServers from the Endurance
Configuration, make the necessary changes, and
then reboot the CoServer back into the
Configuration.
Online Endurance CoServer Mode. The
normal operating mode of a Endurance CoServer.
Both CoServers are functioning fully and are either
synchronized or are in the process of
synchronizing. Also in this mode, the Virtual
Server can be running in lockstep on both
CoServers.
pointer. An industry-standard term for input
devices such as a mouse, trackball, or touchpad.
POST. Power-On Self Test. A test that each
system passes prior to its initial boot process. The
content of POST is specific to the system’s
manufacturer and model.
product ID. The vendor’s product description in
the standard SCSI inquiry data.
provider. Endurance software driver that
provides access to a specific redirected device or
service. For example, a SCSI provider provides
access to SCSI devices, and an Ethernet provider
provides access to Ethernet devices. Providers
receive and process requests from the FTvirtual
Server. See also redirector.
rail. A pair of network interface cards, one in
each CoServer, used by the FTvirtual Server to
create one redundant network connection.
redirected device.
A device that is available
for reads and writes from the FTvirtual
Server. When a CoServer is in
Online
Endurance CoServer
mode, Endurance
configured devices are redirected. When the
CoServer is in
Offline Endurance CoServer
mode, no devices are redirected.