Q-Logic SN0054621-00 E manual LUN masking, Media, NPort Node Port, NPort ID Virtualization

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SANsurfer iSCSI HBA CLI User’s Guide Command Line Interface for QLogic iSCSI Host Bus Adapters

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 FL_Port.

N_Port ID Virtualization

The ability for a single physical FC end point (N_Port) to support multiple, uniquely addressable, logical end points. With NPIV, a host FC adapter is shared in such a way that each virtual adapter is assigned to a virtual server and is separately identifi- able within the fabric. Connectivity and access privileges within the fabric are controlled by identification of each virtual adapter and, hence, the virtual server using each virtual adapter.

NL_Port (Node Loop Port)

A port capable of arbitrated loop functions and protocols. An NL_Port connects through an arbitrated loop to other NL_Port and at most a single FL_Port. NL_Ports handle creation, detection, and flow of message units to and from the connected systems. NL_Ports are end ports in virtual point-to-point links through

afabric, for example NL_Port to F_Port to F_Port to N_Port using a single FC fabric switch. In the absence of a fabric switch FL_Port, NL_Ports can communicate with other NL_Ports in virtual point-to-point links through a FC_AL open loop circuit often through FC_AL (Arbitrated Loop) hub or loop switch devices. See: E_Port, F_Port, FL_Port, G_Port, N_Port (Node Port).

NIC

Network Interface Controller.

NVRAM

Non-volatile random access memory. A type of memory that retains data even when power is removed. Holds configura- tion settings. You can configure NVRAM settings manually or restore them from a file. These settings are retained when power is removed. NVRAM settings are called HBA parameters in this guide.

SN0054621-00 E Glossary-5