Abstract: A system and method for exposing volumes with underlying read-write mediums to user operations. When a medium is in the process of being replicated to a storage array, a volume which relies on the medium can be exposed to user operations (e.g., snapshots, read and write operations) once the portions of the medium which underlie the volume have been replicated. The volume can be exposed to user operations while one or more other portions of the medium are unfilled and while the medium is in an intermediate read-write state.

Abstract: A system and method for performing replication using mediums. A snapshot ‘S’ is selected for replication, and the anchor medium ‘M’ of S is identified. The replica storage array ‘R’ to which M is being replicated determines a list of medium extents which are available. R sends this list to an original storage array ‘O’ and O generates a list of medium extents which need to be sent to R. Only those medium extents corresponding to M which R does not already have will be sent from O to R. Also, R can obtain medium extents from other source storage arrays during the replication process.

Abstract: Methods and apparatus are provided to establish temporal alignment of media clips. In an example embodiment, first and second media clips each contain an audio portion and the method comprises: determining an estimated global offset between the first and second clips; choosing a first test region of the first clip and identifying a corresponding second test region in the second clip based at least in part on the estimated global offset. The first and second test regions are compared to determine a local offset.

Abstract: A method for synchronizing media clips uses audio data of the media clips. The method estimates a global offset between two media clips. The global offset may be determined in a wide variety of ways. The method selects a first test region of the audio track of the first media clip and uses the global offset to identify a corresponding second test region in the audio track of the second media clip. The first and second test regions are compared, for example by cross-correlation, to determine a local offset. In some embodiments a plurality of local offsets are determined for different parts of the media clips. A computer system may perform the method to automatically synchronize media clips.