User's Manual

All other paths are passive, i.e., they pass through a passive control path drive (see “Active and
passive control path drives” (page 13)).
If the selected device is a tape drive, the capital A indicates the active data path, and there will
be no lower case a.
The Cached Driver Data pane shows the last state of the selected device that was reported by the
failover drivers to the diagnostic application. Because changes in the drivers’ information about
a device are not automatically sent to the diagnostic application, it is necessary to perform a refresh
to get the latest state of the drivers. For tape libraries the cached driver data will contain information
about reservations and prevent media removal as shown in Figure 19 (page 56).
For tape drives the reservation and prevent media removal information is not tracked by the driver
so the Cached Driver Data pane will not include that information for tape drives.
The Device Information pane contains data requested from the tape and changer devices when
various actions are performed.
The bottom pane shows failover session information that has been requested for the selected device.
Actions
There are several actions that can be performed by the diagnostic application.
• Refresh failover drivers’ state information held by the diagnostic application.
• Request current failover information from tape and changer devices.
• Report and clear reservations on changer devices which had been set by hosts that are now
offline.
• Enable extra tracing.
Refresh
The information in the Cached Driver Data pane can be refreshed by selecting Actions→Refresh
Cached Driver Data (F5).
Figure 20 Refresh Cached Driver Data menu item
Device information
The Actions→Report Device menu has three sub-menu items (see Figure 21 (page 57)) which report
information on the drive or media changer selected in the Devices Information pane. The data is
displayed in the Devices Information pane.
Figure 21 Report Device menu item
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