User`s guide

Chapter 2. IBM TotalStorage Enterprise Storage Server configuration 107
One step that is independent from the others, is the configuration of the ESS FC
ports for FC-SW or FC-AL. For this we have to know what type of FC topology we
want to connect with a particular ESS FC port. Other steps rely on the
completion of others.
In order to add ESS logical volumes to disk groups, we need to perform two
configuration steps. Those are the configuration of some disk groups for RAID or
JBOD and the definition of one or more host FC ports by its host type and
WWPN. The host FC port definition is needed because the process of adding
volumes consists not only of creating the volumes but also of assigning them to a
host FC port.
If there are existing ESS logical volumes, we can also assign them to other host
FC ports. Now, if both requirements have been met (ESS logical volumes have
been assigned and the ESS FC ports are defined), we can access the volumes
from the Fibre Channel attached host. Of course, the connectivity must be there
and the host system has to be prepared also. How to achieve this is discussed in
other parts of this book.
2.3 Configuring disk groups
Now we will show how to configure the ESS for FC attachment in detail. We
choose to start our configuration with the disk groups, followed by the
configuration of the host FC ports. The completion of both configuration steps
enables us to add the ESS logical volumes later on.