256 IBM Midrange System Storage Hardware Guide
To make the best use of this feature, set the failover alert delay period such that the host
driver failback monitor runs at least once during the alert delay period. Note that a logical
drive ownership change might persist through the alert delay period, but correct itself before
you can inspect the situation. In such a case, a logical drive-not-on-preferred-path alert is
issued as a critical event, but the array will no longer be in a needs-attention state.
To change this setting, from the Subsystem Management window, select Storage
Subsystem Change Failover Alert Delay. The window shown in Figure 4-116 opens.
Figure 4-116 Storage subsystem failover alert delay
Important:
The failover alert delay option operates at the storage system level, so one setting
applies to all logical drives.
The failover alert delay option is reported in minutes in the storage system profile as a
storage system property.
The default failover alert delay interval is five minutes. The delay period can be set
within a range of 0 to 60 minutes. Setting the alert delay to a value of zero results in
instant notification of a logical drive not on the preferred path. A value of zero does not
mean alert notification is disabled.
The failover alert delay is activated after controller start-of-day completes to determine
if all logical drives were restored during the start-of-day operation. Thus, the earliest
that the not-on-preferred path alert will be generated is after boot up and the configured
failover alert delay time.
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