Emc IP Holding Company LLC

Walter O'Brien

Philippe Armangau

David W Harvey

Gregory William Lazar

Steven D Sardella

Sudhir Srinivasan

Daniel E Cummins

Peter Puhov

Robert W Beauchamp

Steven A Morley

Thomas N Dibb

Antonio Fontes

One embodiment is directed to a technique which secures data on a set of storage drives of a data storage system. The technique involves encrypting data from a first tenant using a first tenant key to form first tenant encrypted data and storing the first tenant encrypted data on the set of storage drives. The technique further involves encrypting data from a second tenant using a second tenant key to form second tenant encrypted data and storing the second tenant encrypted data on the set of storage drives, the first tenant being different from the second tenant, and the first tenant key and the second tenant key being per tenant keys which are different from each other. The technique further involves destroying the first tenant key to prevent the first tenant encrypted data stored on the set of storage drives from being decrypted while maintaining the second tenant key to enable decryption of the second tenant encrypted data stored on the set of storage drives.

Securing data using per tenant encryption keys

A technique is directed to managing data. The technique involves identifying a logical page size utilized by a set of SSDs and, based on a first data storage application which stores first data elements in a set of hard disk drives (HDDs), creating a second data storage application which stores second data elements in the set of SSDs. Each first data element has a first size which is larger than the logical page size utilized by the set of SSDs. Each second data element has a second size which is equal to the logical page size utilized by the set of SSDs. The technique further involves operating, by processing circuitry coupled to the set of SSDs, the second application to store the second data elements in the set of SSDs. Such a technique is well-suited for a data storage system that stores host data in an array of SSDs.

Utilizing flash optimized layouts which minimize wear of internal flash memory of solid state drives

An electronic assembly perform data storage operations on behalf of a set of storage processors (SPs). The electronic assembly includes an enclosure, and a set of peripheral component interconnect express (PCIe) switches which installs within the enclosure. The set of PCIe switches is constructed and arranged to connect to the set of SPs while the set of SPs is external to the enclosure. The electronic assembly further includes a set of data storage devices which installs within the enclosure. The set of data storage devices is constructed and arranged to persistently store data on behalf of the set of SPs via PCIe-based communications through the set of PCIe switches.

Provisioning an enclosure with PCIe connectivity and storage devices

Described are techniques for processing data. A notification is sent from an application to a cache manager to invalidate any cache location storing data for a first logical address. Responsive to receiving the notification, first processing is performed by the cache manager comprising determining whether data for the first logical address is stored in a cache location; and if it is determined that data for the first logical address is stored in the cache location, designating the cache location as any of free and available for reuse. The foregoing processing for invalidation may also be performed to invalidate a set of cache locations for data from multiple logical addresses.

Discarding cached data before cache flush

A method of writing data to persistent storage includes (a) for each data block of a set of data blocks, storing data of that data block at an offset within a log segment of the persistent storage in conjunction with a logical block address (LBA) of that data block on the persistent storage, a size of the log segment being larger than a size of each data block, (b) identifying a particular log segment of the persistent storage that has become filled with data blocks, and (c) upon identifying the particular log segment as having become filled, inserting pointers to respective data blocks stored within the particular log segment into respective locations defined by the respective LBA of each respective data block within a map tree.

Growing community of inventors

Westborough, MA, United States of America

Walter O'Brien