26 External Storage XP for the XP12000/XP10000
NOTE: When the external disk array is an EVA disk array, as you restore the path with the highest
priority, the I/O execution path switches back to the restored highest priority path. In this case, the
status of the path for which the status changed to Normal when the error occurred changes back to
Standby.
Figure 7 Alternate path mode is Single mode with alternate paths in Normal and Standby
NOTE: External disk arrays with Asymmetrical Active/Active (AAA) controllers, such as the Hitachi
Thunder, are an example of Figure 7. A notable characteristic of using AAA controller disk arrays
as external storage is that paths to alternate ports on the owning controller for a given external LU
are seen as Normal status, but I/O load balancing does not occur (either across controllers or
across ports to the owning controller). Paths to the non-owning external controller’s ports are shown
as Standby status.
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