Infinidat Ltd.

Nir Schenkler

Yechiel Yochai

Efraim Zeidner

Ido Ben-Tsion

Josef Ezra

Sivan Tal

Mike Dorfman

A method for synchronizing between a primary control node of a storage system and a secondary control node of the storage system, the method may include performing a change in a key-value store that is stored in shared memory of the storage system and includes control metadata for controlling access to data stored in the storage system; the shared memory is accessible to the primary control node and to a secondary control node; generating a change indication that (i) is indicative of the change in the key-value store and (ii) requests the secondary control node to introduce changes in one or more additional data structures that are not stored in the shared memory; the change in the key-value store comprises replacing a previous given value with a current given value that is associated with a given key; sending the change indication to the secondary control node; receiving an acknowledgement from the secondary control node; wherein the acknowledgement indicates at least one of the following: (i) the secondary control node received the change indication and (ii) the secondary control node introduced the changes in the one or more additional data structures that are not stored in the shared memory; and deleting, by the primary control node, the previous given value from the shared memory.

Synchronizing control nodes and a recovery from a failure of a primary control node of a storage system

There is provided a storage system and a method of identifying delta-data therein between two points-in-time. The method comprises: generating successive snapshots Sand Scorresponding to the two points-in-time; upon generating the snapshot S, searching the cache memory for data blocks associated with snap_version=i, thereby yielding cached delta-metadata; searching the SF mapping data structure for destaged data blocks associated with snap_version=i, thereby yielding destaged delta-metadata; and joining the cached delta-metadata and the destaged delta-metadata, thereby yielding delta-metadata indicative of the delta-data between points-in-time corresponding to the successive snapshots with Snap_ID=i and Snap_ID=i+1. The method operates with no need in copying, destaging to a dedicated location and/or any other special handling of data that needs to be transmitted to the RS system.

Storage system capable of managing a plurality of snapshot families and method of operating thereof

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Tel Aviv, Israel

Nir Schenkler