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Oracle Tips by Burleson |
Disk I/O Tuning
Chapter 2:
Fibre Channel
Ports
Ports provide the link
to the outside world for a Fibre Channel node. As stated above, each
node has at least one port (usually 2) to provide access to other
nodes. Most manufacturers' Fibre Channel drives have two ports. Each
port utilizes a pair of fibers, one to carry information into the
port and one to carry information out of the port. This pair of
fibers (sometimes they are actually copper wire) is called a “link”
and is part of each topology. The Fibre Channel ANSI specification
also supports fibers made of optical strands as a medium for data
transfer.
As stated above, ports
used in a FC-AL topology are called node loop ports (NL_Ports). In
addition to NL_Ports, other port types exist as shown in table 2-2.
Port type
|
Location
|
Associated topology
|
|
N_Port |
Node |
Point-to-point or Fabric |
|
NL_Port |
Node
|
in N_Port
mode—Point-to-point or Fabric, in NL_Port mode—Arbitrated
Loop |
|
F_Port
|
Fabric |
Fabric |
|
FL_Port |
Fabric
|
in F_Port
mode—Fabric, in FL_Port mode—Arbitrated Loop |
|
E_Port |
Fabric
|
Internal
Fabric Expansion |
|
G_Port |
Fabric |
in F_Port
mode—Fabric, in E_Port mode—Internal fabric expansion |
|
GL_Port |
Fabric |
in F_Port
mode—Fabric, in FL_Port mode—Arbitrated Loop' in E_Port
mode—Internal fabric expansion |
Table 2-2: Fibre Channel Port Types
The above text is
an excerpt from:
Oracle Disk I/O Tuning
Disk IO Performance & Optimization for Oracle
Databases
ISBN
0-9745993-4-4
by Mike Ault
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