max size doesn't take in consideration minimum 4kb block size.

[hjudez]

I am using this cache to store many many small files. I set a max of 256MB but the cache grows up to more than 450MB. That's because each small file takes at least 4kb in disk. Since this is a disk cache I would assume that setting a max would take block size in consideration.

[gubatron]

+1 for a patch if there aren't already ways to ask/set max phys size.

[swankjesse]

Best advice is to work-around by setting the cache size smaller. From the Javadocs:

 * <p>This cache limits the number of bytes that it will store on the
 * filesystem. When the number of stored bytes exceeds the limit, the cache will
 * remove entries in the background until the limit is satisfied. The limit is
 * not strict: the cache may temporarily exceed it while waiting for files to be
 * deleted. The limit does not include filesystem overhead or the cache
 * journal so space-sensitive applications should set a conservative limit