Vast Data Ltd.

Uri Weissbrem

Oren Ashkenazi

Ohad Ben-Yehuda

Avi Goren

A method for transitioning from asynchronous replication to a synchronous replication, the method includes (i) receiving, by a DSS and following the start of the transitioning, a synchronous update related to a first FSE part; (ii) implementing the synchronous update of the first FSE part; (iii) receiving, by the DSS and following the start of the transitioning, an asynchronous update related to a last version of a second FSE part before the start of the transitioning; (iv) ignoring the asynchronous update when the DSS currently stores a version of the second FSE part that is associated with a timestamp that is indicative of a point in time that exceeds the start of the transitioning; and (v) else—implementing the asynchronous update.

Asynchronous to synchronous replication transition

A method for snapshot reversion, the method may include initializing a recovery of a storage system, from a failure that stopped a replication of a failed replication snapshot to an other storage system; wherein the other storage system reverted to an older snapshot not stored in the storage system; and reverting to the older snapshot, by the storage system using older snapshot metadata and data received from the storage system; wherein the older snapshot data may include a non-existing indication for a snapshot segment that existed in a snapshot that followed the older snapshot and not exists at the older snapshot, and wherein the data may include one or more older snapshot segments; wherein the reverting to the older snapshot is executed without undoing changes that were made since the older snapshot.

Replication for snapshot reversion

A method for generating a reconstructed version of a filesystem entity, the method may include (i) generating fallback retrieval metadata for a reconstructed version segment, when the reconstructed version segment is (a) associated with a corresponding intermediate version segment, and (b) the corresponding intermediate version segment is preceded by a corresponding most updated segment that does not exceed a fallback version of the filesystem entity; wherein the reconstructed version segment, the corresponding intermediate version segment and the corresponding most updated segment that does not exceed a fallback version have a same address range; (ii) generating a non-existing indicator for the reconstructed version segment, when the reconstructed version segment is (a) associated with the corresponding intermediate version segment, and (b) the corresponding intermediate version segment is not preceded by any corresponding most updated segment that does not exceed the fallback version; and (iii) maintaining intermediate metadata for retrieving one or more intermediate versions of the filesystem entity.

Growing community of inventors

Tel Aviv, Israel

Uri Weissbrem