HP StorageWorks External Storage XP user guide for the XP12000, XP10000, SVS200 (T1706-96009, October 2007)

Figure 6 Alternate path mode is Single mode

• Alterna

te path mode is Single mode and at least one alternate path is in Standby status

Figure 7

shows an example of when the alternate path mode is Single mode and there are alternate

paths in

Normal and Standby status. Figure 8 shows another example of when the alternate path

mode is Single mode. In Figure 8, there are alternate paths in Standby status only.

When an error occurs in the path used for I/Os, the I/O execution path switches to the path with the

second highest priority in Normal status (Figure 7). If there is no path in Normal status other than the

path used for I/Os, the status of the path in Standby status automatically changes to Normal and the

I/O execution path switches to that path (Figure 8).

NOTE:

When the external array is an EVA 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.

Preparing for External Storage XP operations