Technical data

The configuration that is shown in Figure 6–8 is a NSPOF configuration,
but is not a recommended cluster configuration because of the performance
loss during failure conditions. If a switch or cable failure causes a failover to
the other switch, access to the storage units has to be moved to the other
controller, and that takes time. In the configurations shown in Figure 6–6
and Figure 6–7, the failure would cause access to the storage unit to shift
to the other port of the same controller. This is faster than a change of
controllers, providing better overall performance.
______________________ Note _______________________
If you have a configuration like the one that is shown in
Figure 6–8, change the switch to HSG80 cabling to match the
configurations that are shown in Figure 6–6 or Figure 6–7.
The single-system configuration that is shown in Figure 6–9 is also a
configuration that we do not recommend.
6–14 Using Fibre Channel Storage