Blackouts with EMCTL

I have a need to take down a database to perform a cold snapshot of the database’s files. This database is monitored by Enterprise Manager and I do not want to receive an alert when the database is down. So I need to figure out how to start a blackout in Enterprise Manager from the command line which will be included in our backup script.

On the database server, do the following:

cd $AGENT_HOME/bin
./emctl start blackout TestBlackoutEMCTL fgodba.acme.com
Oracle Enterprise Manager 11g Release 1 Grid Control 11.1.0.1.0
Copyright (c) 1996, 2010 Oracle Corporation. All rights reserved.
Blackout TestBlackoutEMCTL added successfully
EMD reload completed successfully

We can verify the blackout is in effect in Enterprise Manager. Sign on to EM and click on Setup -> Blackouts. You should see something similar to the following:

Select the blackout radio button and click the View button.

We can verify that the blackout name contains the string that I denoted when I started the blackout with the date and time appended to it.
We can also query the status of the blackout on the command line:
./emctl status blackout
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Copyright (c) 1996, 2010 Oracle Corporation. All rights reserved.
Blackoutname = TestBlackoutEMCTL
Targets = (fgodba.acme.com:oracle_database,)
Time = ({2012-04-26|13:27:32,|} )
Expired = False

It is now time to end the blackout.

./emctl stop blackout TestBlackoutEMCTL
Oracle Enterprise Manager 11g Release 1 Grid Control 11.1.0.1.0
Copyright (c) 1996, 2010 Oracle Corporation. All rights reserved.
Blackout TestBlackoutEMCTL stopped successfully
EMD reload completed successfully

This process is documented here:
http://docs.oracle.com/html/B12013_03/emctl.htm#i1030612