Cisco Cisco Secure Access Control System 5.1

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Syslog data loss during upgrade.

Symptom: When you perform an upgrade, it might take some time to upgrade the Monitoring and 
Report Viewer database. While this upgrade is in progress, ACS continues to receive syslog 
messages. However, the syslog data that is collected during upgrade might not be available in the 
database after upgrade.

Conditions: This problem occurs when you run the upgrade process.

Workaround: After upgrade is complete, before you click the Switch Database button, you must take 
a manual backup of the database. Apply the ACS 5.1.0.44.1 upgrade patch. 

Following scenarios are tested:

Back up the ACS View 5.0 database. If the ACS View database size is more than or equal to 
100 GB, you need to run the backup and configure the destination repository as an external FTP, 
TFTP or NSF server.

Reimage the appliance with ACS 5.1.

Download the patch from the following download location and install it on your system: 

Refer to 

 for instructions on how to apply the patch to your 

system.

Restore ACS View 5.0 database—Database upgrade happens automatically. If the ACS View 
database size is more than or equal to 100 GB, you need to run the backup and configure the 
destination repository as the external FTP, TFTP or NSF server.

Wait for the upgrade to complete. After the upgrade is complete the following message is 
displayed on the ACS View GUI:

Click the Switch Database button below to activate the converted database. You may 

need to scroll down to make it visible.

The ACS processes will restart in order to switch the database. It will be 

necessary to log back in after the restart has completed.

Click Switch Database.

Data from the temporary database is restored to the main database.

Expected results:

Upgrade takes less than 36 hours.

There is no significant data loss.

Upgrade from ACS 5.0 to ACS 5.1.

Wait for the upgrade to complete. After the upgrade is complete the following message is 
displayed on the ACS View GUI:

Click the Switch Database button below to activate the converted database. You may 

need to scroll down to make it visible.

The ACS processes will restart in order to switch the database. It will be 

necessary to log back in after the restart has completed.