EM delete old statistics data

Hi, I have a question about EM stats data. All the articles tell how to remove the statistics database or which size we can allocate for storage. I wanted to know how I can delete some data for example for just 2 months old. Now the disk space on the device seems to be critical :

 

[root@f5:Active:Standalone] f5em_extern df -h

 

Filesystem Size Used Avail Use% Mounted on /dev/mapper/vg--db--sda-set.1.root 5.7G 352M 5.1G 7% /

 

/dev/mapper/vg--db--sda-set.1._config 5.7G 135M 5.3G 3% /config

 

/dev/mapper/vg--db--sda-set.1._usr 5.7G 1.6G 3.9G 29% /usr

 

/dev/mapper/vg--db--sda-set.1._var 19G 581M 18G 4% /var

 

/dev/mapper/vg--db--sda-dat.share.1 30G 26G 2.4G 92% /shared

 

/dev/mapper/vg--db--sda-dat.log.1 6.9G 179M 6.4G 3% /var/log

 

Any ideas?