HP StorageWorks XP Remote Web Console Software - Manual (Page 92)

92 Using XP12000 disk arrays with EVA GL disk arrays attached as subordinated external storage disk arrays
Minimum physical configuration for HA
For highly available (HA) functionality to be possible, each EVA controller must be connected to the
XP12000 so there is at least one fiber channel path from each XP12000 cluster to one of the separate EVA
controllers through their respective fibre channel switch connections. Figure 48 illustrates this connection.
Figure 48 XP12000-EVA minimum connections for HA
This configuration allows the XP12000 to execute basic failover and failback operations with the EVA disk
array subordinated. Unlike the MSA series of disk arrays, the EVA allows access to different logical units
(LUs) from each of the two EVA controllers at the same time. This allows an attached host (or XP12000) to
use both paths shown in Figure 48 for processing I/O simultaneously.
Expanded configuration
To better realize the performance capability of an EVA being used as an external storage disk array, add
the connections illustrated in Figure 48 so each of the two XP12000 clusters have at least one fibre
channel path to each of the two EVA controllers through their respective fibre channel switches and switch
connections as described previously. This configuration allows for a greater performance potential in that