paths to the SMC device server. All other paths are passive, i.e., they pass through a passive control path
drive (see
Active and passive control path drives
on page 14).
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 17: Advanced failover diagnostic
on page 68.
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 18: Refresh Cached Driver Data menu item
Device information
The
Actions
>
Report Device
menu has three sub-menu items (see
on page 70) which report information on the drive or media changer selected in the
Devices
Information
pane. The data is displayed in the
Devices Information
pane.
Actions
69
