Viewing the control device state – Dell POWEREDGE M1000E User Manual
Page 275
Web Tools Administrator’s Guide
247
53-1001772-01
Viewing the control device state
18
DRAFT: BROCADE CONFIDENTIAL
Viewing the control device state
The control device is in either a neutral or a switched state. When it is neutral, the control device
accepts commands from any channel that has established a logic path with it and accepts
commands from alternate managers. When the control device is switched, it establishes a logical
path and accepts commands only from that logical path (“device allegiance”). Commands from
other paths cause a FICON CUP Busy Error. Most “write” operations from alternate managers are
also rejected.
Device allegiance usually lasts for a very short time. However, under abnormal conditions, device
allegiance can get “stuck” and fail to terminate. It might cause the switch to be unmanageable with
CUP, and you will continue to receive the FICON CUP Busy Error. In this case, you should check the
control device state and the last update time to identify if the device allegiance is stuck. The Web
Tools Switch Administration window displays the control device state and last update time. You can
click Refresh to get most recent update.
NOTE
You can manually reset allegiance to bring the control device back to the neutral state by clicking
Reset Allegiance in the FICON CUP Busy Error dialog box.
The following switch parameters being read or modified can cause the FICON CUP Busy error:
•
Mode Register
•
Port Names (also called Port Address Name)
•
PDCM and Port Connectivity Attributes
•
Switch enable/disable
•
Switch name change
Use the following procedure to access the FICON CUP tab.
1. Select a FICON-enabled switch from the Fabric Tree.
2. Open the Switch Administration window as described in
“Opening the Switch Administration
3. Select the FICON CUP tab.
The FICON CUP tabbed page displays, with the FICON Management Server subtabbed page in front.
All attributes on this tab are read-only until FMS Mode is enabled.
The control device state is displayed as neutral or switched in the Control Device Allegiance field.
NOTE
If FMS mode is enabled, and the control device state is unavailable, the FICON CUP Busy Error is
displayed. Click Reset Allegiance in the error message to reset the control device state to its correct
state.