Filter
Top Products
SANsurfer iSCSI HBA CLI User’s Guide
Command Line Interface for QLogic iSCSI Host Bus Adapters
Glossary-6 SN0054621-00 E
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.