Advice re best practice for managing the scan listener logs and list logs

Hi friends,
I've just started a job as a RAC dba administrator for some big 24*7 systems, I've never worked with clusterware and RAC.
2 Space problems
1) Very large listener_scan2.log in /u01/11.2.0/grid/log/diag/tnslsnr/<server name>/listener_scan2/trace folder
2) Heaps of log_nnn.xml files in /u01/11.2.0/grid/log/diag/tnslsnr/<server name>/listener_scan2/alert folder (4Gb used up)
Welcome advice on the best way to manage these in the short term (i.e. delete manually) and the recommended practice and safest way (adri maybe not sure how it works with scan listeners)
Welcome advice and commands that could be used to safely clean these up and put a robust mechanism in place for logfile management in RAC and CLusterware systems.
Finally should I be checking the log files in /u01/11.2.0/grid/log/diag/tnslsnr/<server name>/listener_scan2/alert regulalrly ?
My experience with listener logs is that they are only looked at when there are major connectivity issues and on the whole are ignored.
Thanks for your help,
Cheers, Rob

Have you had any issues that require them for investigative purposes? If not, just remove them. Are the logs required for some sort of audit process? If yes, gzip them to a location where you can use your OS tape backup policies to retain them for n-days. Once you remove an active file, it should recreate the file and continue without interruption.

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