Cisco Cisco Web Security Appliance S690 Guía Del Usuario

AsyncOS will periodically close current log files and begin new ones as a means of managing log file 
size and storage location. This is called log file “rollover”. Based on the retrieval method defined for the 
log subscription, AsyncOS stores the older log files on the appliance for retrieval or delivers them to an 
external computer. 

AsyncOS rolls over log subscriptions in the following ways:

Manually. The appliance administrator can manually roll over log subscriptions on demand from 
either the web interface or the CLI.

Automatically. AsyncOS rolls over log subscriptions when a current log file reaches a 
user-specified limit of maximum file size or maximum time since last rollover. This is configured 
as part of the subscription settings.

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Choose System Administration > Log Subscriptions.

Check the checkbox in the Rollover column of the log subscriptions you wish to roll over, or check the 
All checkbox to select all the subscriptions.

Click Rollover Now to roll over the selected logs.

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To save disk space on the Web Security appliance, log subscriptions can compress rolled over log files 
before storing them on the disk. Only rolled over logs are compressed. The current active log file is not 
compressed.

Each log subscription has its own log compression setting, so you can choose which log subscriptions 
to compress. AsyncOS compresses log files using the gzip compression format.