Resumen
Cloud availability is an important parameter present in a typical Service Level Agreement (SLA). In order to check compliance with SLA commitments, a third party availability measurement is strongly needed. An availability estimation methods is evaluated here, based on the periodic repetition of sequence of probing packets in ICMP. Majority Voting, which declares a cloud to be available only if a majority of probing packets gets an echo from the cloud, appears to provide an accurate estimation even when the packet loss probability is rather high.