NOTE. OPTIMUMCACHE IS NO LONGER SUPPORTED.
On servers with kernel prior to lve1.2.55 ploop will not be used (due to ploop related issues in the kernel). Instead cached files will be stored in /var/cache/optimumcache.
The cache will be cleaned (shrunk) by 20% once partition on which OPTIMUMCACHE_MNT resides has only 10% of free space. You can change that by changing PURGEAHEAD param in /etc/sysconfig/optimumcache, and restarting optimumcache service.
The cache is cleaned /etc/cron.d/optimumcache_cron script optimumcache_purge, which runs every minute:
0-59 * * * * root /usr/share/optimumcache/optimumcache_purge