Q-Logic SN0054621-00 E manual Network adapter, Path, Point-to-point, Port instance, Target

SANsurfer iSCSI HBA CLI User’s Guide

Command Line Interface for QLogic iSCSI Host Bus Adapters

S

network adapter

A chip that provides network capabilities. A computer may include a network adapter on its system board, or on an adapter card. Also a NIC (network interface card or controller).

ONC

Open network computing. A remote proce- dure call developed by Sun Microsystems.

path

A path to a device is a combination of a HBA port instance and a target port as distinct from internal paths in the fabric network. A fabric network appears to the operating system as an opaque network between the HBA (initiator) and the target.

Since a path is a combination of an HBA and a target port, it is distinct from another path if it is accessed through a different HBA and/or it is accessing a different target port. Consequently, when switching from one path to another, the driver might be selecting a different HBA (initiator), a different target port, or both.

This is important to the driver when selecting the proper method of failover notification. It can make a difference to the target device, which might have to take different actions when receiving retries of the request from another initiator or on a different port.

point-to-point

Also FC-P2P. Two FC nodes directly connected (not in a loop).

port

Access points in a device where a link attaches. There are four types of ports, as follows:

„N_Port (Node Port)—an FC port that supports point-to-point topology.

„NL_Port (Node Loop Port)—an FC port that supports loop topology.

„FL_Port—a port in a fabric where an N_Port can attach.

„FL_Port—a port in a fabric where an NL_Port can attach.

port instance

The number of the port in the system. Each HBA may have one or multiple ports, identified with regard to the HBA as port 0, port 1 and so forth. to avoid confusion when dealing with a system containing numerous ports, each port is assigned a port instance number when the system boots up. So Port 0 on an HBA might have a port instance number of, for example, 8 if it is the eighth port discovered by the system.

SAN

Storage area network. Multiple storage units (disk drives) and servers connected by networking topology.

SCSI

Small computer system interface. A high-speed interface used to connect devices, such as hard drives, CD drives, printers, and scanners, to a computer. The SCSI can connect many devices using a single controller. Each device is accessed by an individual identification number on the SCSI controller bus.

target

The storage-device endpoint of a SCSI session. Initiators request data from targets. Targets are typically disk-drives, tape-drives, or other media devices. Typically a SCSI peripheral device is the target but an HBA may, in some cases, be a target. A target can contain many LUNs.

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