I/O Path Configuration Examples For Redundant Fibre Channel Fabrics - Compaq 112726-001 - ProLiant - 6500 Administrator's Manual

I/O Path Configuration Examples for Redundant
Fibre Channel Fabrics
Every I/O path connection between host adapters and array controller ports is
active at the same time. An active port does not become inactive unless it fails,
whereupon all I/O activity on the failed path is automatically switched over to
the pre-defined backup I/O path.
Dual Redundancy Configuration Example
In a redundant Fibre Channel Fabric, a dual redundancy configuration is the
minimum allowable configuration that provides redundancy along the I/O
paths. This configuration provides two of each component along the I/O paths.
These include at least two nodes, two host adapters in each node, and two
Fibre Channel SAN Switches.
Figure 2-9 shows the correct method for cabling the I/O path components in a
dual redundancy configuration. In this example, both Fibre Channel SAN
Switches connect to port 1 on one array controller and to port 2 on the other
array controller in each MA8000/EMA12000 Storage Subsystem. If one Fibre
Channel SAN Switch fails, the other switch still has access to port 1 on one
array controller and port 2 on the other array controller in each storage
subsystem. This ensures that the host adapters can still access the full range of
LUNs.
Cluster Architecture 2-21