User`s guide

98 Implementing an Open IBM SAN
Using the ESS interfaces row
Below the host interface row, we see the row with icons for the ESS installed
interface adapters, shown in Figure 2-24.
Figure 2-24 Installed ESS interfaces row
The row is divided into four columns to show the location in the ESS interface
bays. Our ESS is equipped with four ESCON adapters and four SCSI adapters,
with one of them in each bay, and 8 Fibre Channel adapters, with two of them in
each bay. For a Fibre Channel ESS, which also has to serve a few SCSI and
ESCON attached hosts, this is a fairly balanced setup.
As opposed to the host interfaces row, the icons shown in the ESS interfaces row
represent adapters, not ports. If an adapter type, for instance a SCSI adapter,
features two ports, we have still one icon.
We can also see how many ports a specific adapter type offers. We can see that
ESCON and SCSI adapters are dual ported and the FC adapters are single
ported. For clarity, we use the term ESS FC port in this redbook, even when
talking about the adapter itself.
The ESS interface adapter icons can also be selected, which will change the
view of the panel. For instance, it will display information of the type and
configuration of the adapter.
Graphically, the representation of the adapters is different to help to distinguish
between them. The different representations of the adapters are shown in
Figure 2-25, Figure 2-26, and Figure 2-27.
Figure 2-25 ESS ESCON adapter with two ports