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SANsurfer FC/CNA HBA CLI User’s Guide
Command Line Interface for QLogic FC and FCoE Adapters
Glossary-2 SN0054614-00 K
boot device
The device, usually the hard disk, that
contains the operating system the BIOS
uses to boot from when the computer is
started.
cache
A temporary high-speed storage (memory)
area where recently used or frequently
accessed data is stored for rapid access,
thus increasing the efficiency of processor
operations.
Cache contents duplicate recently-used
values stored on disk or elsewhere. Cache
is quick to access relative to the original
data, which either takes more time due to
slow disc-access time, or is slow to
compute. After data is stored in the cache,
future use can be made by accessing the
cached copy rather than re-finding or
recomputing the original data, so that the
average access time is lower.
L1 cache—Primary (smallest) cache
on the same chip as the processor.
L2 cache—Secondary (larger) cache.
Either on the processor chip or
external to the processor.
class of service
See CoS.
CNA
Converged network adapters support both
data networking (TCP/IP) and storage
networking (FC) traffic on a single I/O
adapter using two new technologies:
Enhanced Ethernet and Fibre Channel
over Ethernet (FCoE).
converged network adapter
See CNA.
CoS
Class of service (CoS) is a 3-bit field within
a layer two Ethernet frame header when
using IEEE 802.1Q. It specifies a priority
value of between 0 (signifying best-effort)
and 7 (signifying priority real-time data)
that can be used by quality of service disci-
plines to differentiate traffic.
CoS is a way of managing traffic in a
network by grouping similar types of traffic
(for example, e-mail, streaming video,
voice, large document file transfer)
together and treating each type as a class
with its own level of service priority.
Fibre Channel classes of service include
Class 1, 2, 3, 4, and 6.
CSV file
A comma separated values file. A data file
used for storage of data structured in a
table form. Each line in the file corre-
sponds to a row in the table. Within a line,
fields are separated by commas, each field
belonging to one table column.
data center bridging
See DCB.
data center bridging exchange protocol
See device.
data center Ethernet
See DCE.
DCE
Data center Ethernet (DCE) is a Cisco
term that refers to enhancements to
Ethernet bridges that enables LAN and
SAN connectivity over an Ethernet
network. The acronym DCE is a Cisco
trademark. The enhancements described
within Cisco Data Center Ethernet helped
create the IEEE 802.1 Data Center
Bridging working group (DCB).