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iSR6250 Intelligent Storage Router
Installation Guide
Glossary-6 SN0051103-00 A
S
path
A path to a device is a combination of a
adapter 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 adapter (initiator) and the
target.
Because a path is a combination of an
adapter and a target port, it is distinct from
another path if it is accessed through a
different adapter and/or it is accessing a
different target port. Consequently, when
switching from one path to another, the
driver might be selecting a different
adapter (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.
PCM
Power and cooling module. A device that
consists of one power supply and three
fans.
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—an FC port that supports
point-to-point topology.
NL_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 adapter may have one or multiple
ports, identified with regard to the adapter
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 adapter
might have a port instance number of 8, for
example, if it is the eighth port discovered
by the system.
POST
Power-on self test. Diagnostics that the
router performs at start-up.
RISC
Reduced instruction set computer. A
computer microprocessor that performs
fewer types of computer instructions,
thereby operating at higher speeds.
RSCN
Registered state change notification.
RSCN is an FC fabric notification sent to
all specified nodes when any major fabric
changes occur. This notification allows
nodes to immediately gain knowledge
about the fabric and react accordingly.
router log
Log of messages describing events that
occur on the intelligent storage router.
SAN
Storage area network. Multiple storage
units (disk drives) and servers connected
by networking topology.