IBM TotalStorage NAS Gateway 500 Administrator's Manual page 52

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Figure 7. Local Site Mirroring Network for two nodes
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NAS Gateway 500 Administrator's Guide
v Two nodes at local site; one node at remote site
v One node at local site; two nodes at remote site
v One node at local site; one node at remote site
4. Click Next to configure your networks to be used for remote mirroring, which
are called the GeoNetworks. You will see a panel for the local site mirroring
network, followed by a panel for the remote site mirroring network. The number
of nodes that display on each panel depends on the Site Topology selection for
that site (either one or two).
5. If you want to aggregate multiple Ethernet ports for increased performance and
availability and you have a properly configured Ethernet switch, click
Configure Link Aggregation to aggregate one or more ports together. This
will launch the Link Aggregation Wizard as described in Chapter 14, "Using the
Link Aggregation Wizard," on page 67.
6. Enter a site name, subnet mask, and the default gateway IP address. You
must use a site name ranging from one to 21 alphanumeric or underscore
characters.
7. Click to select Dominant site, if appropriate. The dominant site is the site that
will take over in case all communication is lost between sites.
You can select either the local or remote site as the dominant site. Only one
site can be dominant. For topologies with two nodes at a local site and two
nodes at a remote site, or one node at a local site and one node at a remote
site, when the site becomes isolated (all mirroring network connections
between sites are lost) and the subordinate site determines that the dominant
site is still alive, the non-dominant site takes itself down by stopping the
cluster. If the cluster does not stop within two minutes, the subordinate site

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