Q-Logic FC HBA CLI As opposed to a SAN. See SAN Storage Area Network, Device’s Alpa on the loop

SANsurfer FC HBA CLI User’s Guide

Command Line Interface for QLogic Fibre Channel Host Bus Adapters

S

IOCB

I/O control block. An IOCB is a command structure in QLogic ISP architecture.

ioctl (input/output control)

A system call in Unix/Linux systems. Allows an application to control or commu- nicate with a device driver outside usual read/write operations.

JBOD (Just a Bunch of Disks)

As opposed to a SAN. See SAN (Storage Area Network).

L_Port (Loop Port)

Does arbitrated loop functions and proto- cols. NL_Ports and FL_Ports are examples of loop-capable ports. See E_Port (Expansion Port), F_Port, FL_Port (Fabric Loop Port), G_Port (Generic Port), N_Port (Node Port), NL_Port (Node Loop Port).

LIP (Loop Initialization Process)

The initialization process in an arbitrated loop that occurs when the loop is powered up or a new device is added. One function of a LIP is to assign addresses. All data transmission on the loop is suspended during a LIP.

load balancing

A software feature that improves system performance by balancing device access between multiple HBAs for maximum resource efficiency. Available in Windows 2000/Windows Server 2003, Novell NetWare, and Red Hat/SuSE Linux.

loopback

Diagnostic tool that routes transmit data through a loopback connector back to the same HBA.

loop ID

The device’s AL_PA on the loop.

LUN

Logical Unit Number, a subdivision of a SCSI target. It is the small integer handle that differentiates an individual disk drive or partition (volume) within a common SCSI target device such as a disk array.

Technically, a LUN can be a single physical disk drive, multiple physical disk drives, or a portion (volume) of a single physical disk drive. However, LUNs are typically not entire disk drives but rather virtual partitions (volumes) of a RAID set.

Using LUNs, the FC host can address multiple peripheral devices that may share a common controller.

LUN masking

A software feature that assigns LUNs to specific servers or hides LUNs from specific servers for maximum access and availability control.

media

Physical-layer information carriers. FC supports several different physical media: copper, multimode optical, and single-mode optical. All FC protocols are supported on all media.

NPIV

N_Port ID Virtualization.

N_Port (Node Port)

Aport that connects by a point-to-point link to either a single N_Port or a single F_Port. N_Ports handle creation, detec- tion, and flow of message units to and from the connected systems. N_Ports are end ports in virtual point-to-point links through a fabric, for example N_Port to F_Port to F_Port to N_Port using a single FC fabric switch. See F_Port (Fabric Port).

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