Q-Logic SN0054621-00 E manual CoS, Comma separated values CSV file, Device, Driver

SANsurfer iSCSI HBA CLI User’s Guide

Command Line Interface for QLogic iSCSI Host Bus Adapters

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.

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