User`s guide

132 Implementing an Open IBM SAN
Placing the volumes in selected disk groups
Now, as we have defined how many volumes and of what size we want to add,
we can also decide how the selected space should be used for the placement of
the volumes.
The two choices we have are shown in the Volume Placement frame. This is
shown in Figure 2-74.
Figure 2-74 Volume Placement frame, spreading volumes selected
Here we can choose whether we want to place the volumes sequentially on all
selected disk groups, or if we want to spread the volumes over all selected disk
groups.
Placing volumes sequentially means that, in our case, the two 16.1 GB volumes
would both be placed on the first selected disk group. If we wanted to configure a
large number of 16.1 GB volumes, this would mean that the first 13 of them
would be placed on the first disk group and the following would start to fill the
second disk group.
In contrast to this, spreading volumes across all selected storage areas means
exactly what it says. In our case, one of our two 16.1 GB volumes is going to be
placed on each selected disk group.
Performing the configuration update
Our panel now looks like that shown in Figure 2-75, just before we apply the
configuration changes by pressing the Perform Configuration Update button.