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36 Preparing Your Systems for Clustering
• Discovery domains and login control service – Resources in a typical
storage network are divided into manageable groups called discovery
domains. Discovery domains help scale the storage network by reducing
the number of unnecessary logins; each initiator only logins to a subset of
targets which are within the domain. Each target can use Login Control to
subordinate its access control policy to the iSNS server. Only initiators
matching the required identification and authentication are allowed access
by the target during session establishment.
• Open mapping of Fibre Channel and iSCSI devices – The iSNS database
can store information about Fibre Channel and iSCSI devices and
mappings between the two in a multi-protocol environment. The mapped
information is then available to any authorized iSNS client.
When you start the storage system, the iSNS client on the storage system
gathers all the storage-system iSCSI port information and stores it locally
on the storage system. When you add a cluster node to the storage system
iSNS configuration, Navisphere Express establishes a connection from the
storage system to the iSNS server, and then registers the information
stored on the storage system with the iSNS server.
For information about setting the iSNS service in your iSCSI storage
network, see your Microsoft and EMC documentation.
NOTE: iSNS is supported only on systems running a Windows operating
system in an iSCSI network configuration.
To configure iSNS client, login to Navisphere Express. For each iSNS server to
which you want the storage system to connect:
1
In the
Manage iSCSI
window, click
iSNS
.
2
In the
iSNS Servers
window, click
Add
.
3
In the
Add iSNS Servers
dialog box, enter the IP address of the cluster
node you are adding.
4
Click
Apply
to notify the SP iSCSI port information to the cluster node.
5
In the
iSNS Servers
dialog box, select the cluster node that you want to
configure as the primary server and click
Set Primary
.