Means data are available most of the time. A failure could cause some data not to be available, but only catastrophic failures cause everything down.
(1) Dynamo is highly focused on availability achieved by replication.This feature has deeply influenced the customer experience,which translates into revenue from commercial transactions.It aims to achieve an ‘‘always writable’’ data store because rejecting customer updates could result in a poor customer experience and the conflicts are resolved during the read operation. Dynamo powers Amazon Web Services such as Amazon S3 for cloud computing, including Dropbox and Ubuntu One [10,11].