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Chapter 3 Storage Arrays 3-47
Device Tree
The Enterprise Management Window Device Tree provides a hierarchical view of all
the host-agent and directly managed storage arrays (Figure 3-26). The storage
management station node is the root node and sends the storage management
commands. When storage arrays are added to the Enterprise Management Window,
they are shown in the Device Tree as child nodes of the storage management station
node. A storage array can be managed through an Ethernet connection on each
controller in the storage array (directly managed) or through a host interface
connection to a host with the host-agent installed (host-agent managed).
FIGURE 3-26 Device Tree Example
There are two ways to add storage arrays to the Enterprise Management Window:
■ Automatic Discovery - detects directly managed and host-agent managed storage
arrays on the local subnetwork and adds them to the Enterprise Management
Window automatically. The Enterprise Management Window detects host-agent
managed storage arrays by locating any hosts that provide network management
connections to the storage arrays. The hosts appear in the Device Tree with their
associated storage arrays.
■ Add Device - provides the ability to manually add directly managed and host-
agent managed storage arrays to the Enterprise Management Window. For a
directly managed storage array, a host name or IP address must be entered for
each controller in the storage array. Typically, there are two controllers in a single
storage array. For a host-agent managed storage array, a host name or an IP
address must be entered for the host that is attached to the storage array.
The first time storage arrays are detected or added to the Enterprise Management
Window, they are shown as <unnamed> in the Device Tree and Device Table unless
they have been named by another storage management station. Storage Management
Station Node Host-Agent Managed Storage Array Directly Managed Storage Array