1. A computerized apparatus having a processor, the computerized apparatus comprising: a probability module configured to determine a probability to select each of read-ahead policies, said probability module is configured to determine the probability based on a reward associated with a first read-ahead policy, the reward is based on a performance of the first read-ahead policy by a storage system during a first phase; and a read-ahead policy selector configured to select a second read-ahead policy for a second phase from the read-ahead policies based on the probability determined by said probability module.