Big space usage for diag and admin directories

Hello,

I have noticed that there is regular free space drop on the server. One time it reached 0 and oracle backup has failed.

I noticed following sizes for two directories, which looks like suspicious:

106G	/home/oracle/app/oracle/diag
31G	/home/oracle/app/oracle/admin

Under diag I see following usage:

93G	./tnslsnr/orcl
13G	./tnslsnr/localhost

31G	./trace
63G	./alert

Examples of logs per day:

-rw-r-----  1 oracle oinstall 10486130 May 25 01:09 log_6382.xml

-rw-r-----  1 oracle oinstall 10486004 May 25 05:40 log_6383.xml

-rw-r-----  1 oracle oinstall 10485926 May 25 08:33 log_6384.xml

-rw-r-----  1 oracle oinstall 10486060 May 25 10:46 log_6385.xml

-rw-r-----  1 oracle oinstall 10486020 May 25 13:09 log_6386.xml

-rw-r-----  1 oracle oinstall 10485764 May 25 15:37 log_6387.xml