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C-90 Sun Confidential: Internal Only 96257
Revision A
environmental stress screening (ESS). A method of
causing weak components in a machine to fail by apply-
ing environmental stresses much greater than normal
product environmental specifications, including tempera-
ture extremes, temperature shock, and vibration.
EPE. Early/External Product Evaluation
ERP. See error recovery procedure
.
error correction code (ECC). One or more bytes con-
taining sufficient information about a given amount of da-
ta to permit reconstruction of a predefined number of
(lost) bits of that data. A code that detects and corrects
error bursts by using check bytes.
error log. An accumulation of data by a unit under test
for transmission to a RRC PC for analysis and problem
determination.
error recovery procedure (ERP). One of a set of stan-
dard procedures used by a host system I/O supervisor to
handle errors that are sent with a unit check status by a
control unit, and are described by sense data.
ESA. Enterprise Systems Architecture.
ESCD. See ESCON Director
.
ESCON. See Enterprise Systems Connection.
ESCON channel. A fiber optic device that connects a
host and main storage with the I/O control units.
ESCON Director (ESCD). A device that provides con-
nectivity capability and control for attaching any two ES-
CON links to each other.
ESD. Electrostatic discharge.
ESS. See environmental stress screening
.
event log. Data collected and stored in a machine log by
a subsystem.
event record. One of six record types in an event log
file. The record is logged out at the time of a device fail-
ure or other event, and contains all data to reconstruct
an event for failure analysis.
EVT. Engineering Validation Test. At Sun StorageTek, a
testing phase where a debugged system is validated for
functionality and compliance to specification.
ExLM. Expert Library Manager
ExOM. Expert Online Manager
ExPR. Expert Performance Reporter. A VTSS host soft-
ware product that collects performance data and gener-
ates reports about Sun StorageTek Nearline ACSs and
VTSS status and performance.
Extended Capacity. A VTSS feature that allows users to
define subsystem functional capacity in excess of its
physical capacity.
extended operator panel. An ExPR facility that allows
operator interaction with and control of a VTSS through a
host operator console in lieu of a local operator panel.
extent. Also called logical disks
. A set of contiguously
addressed blocks in a storage entity (physical disk drive,
virtual disk drive, array, etc.). A storage entity may have
one or more extents of varying sizes. Multiple, possibly
non-adjacent, extents may be part of the same mapping
scheme in a virtual disk system.
external storage. Storage devices that are not embed-
ded inside a server. Typically, a host bus adapter (HBA)
is used to connect a RAID subsystem to a server.
F
F-Port. Fabric Port. The access point of fabric where an
N-Port is physically connected. See also fabric, N-Port.
fabric. (1) In Fibre Channel (FC), a structure that allows
addressing of ports on a FC network to be done indepen-
dently of the physical location or address of a target port.
Fabric switches are responsible for passing packets of
data to the target port regardless of which FC loop or
switch the port physically resides on. Multiple fabric
switches can be connected to create large networks with
up to 224 addressable ports. In a FC fabric architecture,
both physical and logical communication channels
(threads) are interwoven from port to port (end to end)
within a storage system. A fabric of linked switches on a
network allow any port on any switch to provide full-
speed access to any other port on the network (subject
to bandwidth availability). (2) The facility that connects
multiple N-Ports. See also F-Port.
FACT. File ACtivities Task.
Fault Symptom Code (FSC). A machine-specific alpha-
numeric code representing a unique state, condition, or
error type associated with an operational event. FSCs
are generated by a system support facility to indicate an
area or component that is the most likely cause of a
problem.
fault tolerance. The ability of a system to keep working
in the event of hardware or software faults, usually
achieved by duplicating key components of the system.
FBA. See fixed-block architecture
.
FC. See Fibre Channel
.
FC-AL. Fibre Channel-Arbitrated Loop. One of the possi-
ble physical topologies of Fibre Channel used to simplify
configurations and reduce costs. In a FC-AL, the Fibre
Channel is connected in a loop with devices all connect-
ing to the loop. A FC-AL allows for up to 126 nodes in a
loop, allocates bus bandwidth evenly among all nodes,
and substantially reduces I/O latency by dedicating a
loop’s capacity during data transmissions.
FCBE. Fibre channel back end.
FCC. Federal Communications Commission. A U.S. gov-
ernment regulatory agency that defines electronic emis-
sions standards for electronic equipment.
FDID. Functional device identifier.
FDT. Functional device table.
fence. The separation of a logical path or physical com-
ponent from the remaining operating portion of a sub-
system, supporting continuous operation and deferred
nondisruptive servicing.
fiber optics. A means of transmitting data digitally
through ultrathin glass or silica fibers using pulses of la-
ser light.
fiber-optic cable. A cable made of ultrathin glass or sili-
ca fibers which can transmit data using pulses of laser
light. Fiber-optic cables have several advantages over
copper cables: they have much less signal loss; they al-
low information to be transmitted at higher speeds and
over longer distances; they are not affected by external
electrical noise; and they are better for transmissions
which require security.
fiber-optic connector. One of several types of devices
used to join pairs of optical fibers together. Some types
are: ST connectors, SMA connectors, MIC connectors,
and SC connectors.