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SANsurfer iSCSI HBA CLI User’s Guide
Command Line Interface for QLogic iSCSI Host Bus Adapters
Glossary-2 SN0054621-00 E
S
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).
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
disciplines 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.
CSV file
A comma separated values (CSV) file
device
A target, typically a disk drive. Hardware
such as a disk drive, tape drive, printer, or
keyboard that is installed in or connected
to a system. In FC, a target device.
driver
The software that interfaces between the
file system and a physical data storage
device or network media.
The level structure for Windows XP
Professional/2000/Windows Server 2003
drivers is as follows:
Class Driver. The highest driver level.
There is a separate class for disk,
Ethernet, and so forth. This level
handles all generic aspects of opera-
tions for that class.
Port Driver. The middle driver level,
which handles aspects of the operation
specific to the port type; for example,
there is a port driver for SCSI.
In Red Hat/SUSE Linux, the driver layers
include:
SCSI Upper Layer. This is the device
management layer. It handles
device-dependent tasks for devices,
such as disks and tapes.
SCSI Middle Layer. This is the SCSI
traffic handling layer. It directs requests
between the kernel and the SCSI.
SCSI Lower Layer. This is the SCSI
HBA driver. It communications directly
to the SCSI HBA.
The structure for Solaris SPARC drivers
includes:
Nexus Drivers. Nexus drivers provide
bus mapping and translation services
to subordinate nexus and leaf devices.
These include drivers for PCI-to-PCI
bridges, PCMCIA adapters, and SCSI
HBAs.
Leaf Drivers. Leaf drivers provide the
traditional character and block driver
interfaces for reading and writing data
to storage and communication
devices. These include drivers for
peripheral devices, including
QLA200/QLA2xxx HBAs, disks, tapes,
network HBAs, and frame buffers.
Miniport Driver. The lowest driver level
and device specific. This level is
usually supplied by the manufacturer
as a companion to a physical device.
Monolithic Driver. This level combines
the functions of different driver levels in
the same driver to increase perfor-
mance.
Adjunct Driver. This level works along
side a driver at the same level to
increase performance.