HP XP P9500 Storage User Manual
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Figure 14 When the path mode is Single mode
Examples of switching I/O execution paths to alternate paths (when the path mode is Single mode
and there is at least one alternate path in Standby status)
shows an example of the case when the path mode is Single mode, and there
are the alternate paths in the Normal status and the Standby status.
shows
another example of the case when the path mode is Single mode. In the case of
, there are alternate paths in the Standby status only.
When an error occurs in the path that is being used for I/Os, the I/O execution path is switched
to the path with the second highest priority in the Normal status. If there is no path in the Normal
status other than the path that is being used for I/Os, the status of the path in the Standby status
is automatically changed to Normal, and the I/O execution path is switched to that path.
As you restore the path with the highest priority, note that only when the external storage system
is EVA storage system, the I/O execution path is switched back to the restored highest priority
path. In this case, the status of the path for which the status has been changed to Normal when
the error has occurred changes back to Standby.
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Prerequisites