Emc IP Holding Company LLC

Joris J M Wils

Richard P Ruef

Techniques for amortizing metadata updates due to data delete operations in data storage systems that implement log structured storage of data from virtual volumes. The techniques employ a segment database (DB) and a deleted chunk DB. The segment DB is implemented as a key-value store. The deleted chunk DB is likewise implemented as a key-value store, but configured as a log structured merge (LSM) tree. By configuring the deleted chunk DB as an LSM-tree, more efficient use of memory and improved reduction of metadata updates can be achieved. Stored segments of log structured data can also be effectively 'cleaned' in a background process that involves ordered traversals of the segment DB and the deleted chunk DB, allowing for more efficient recovery of storage space consumed by the deleted data chunks.

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Acton, MA, United States of America

Joris J M Wils