Emc Corporation

Emc IP Holding Company LLC

Yaron Segev

Renen Hallak

Shahar Frank

Kirill Shoikhet

Tal Ben-Moshe

Niko Farhi

Erez Webman

Kobi Luz

Irit Yadin-Lempel

A CAS data storage method and apparatus comprising: receiving input data including a succession of data items with corresponding logical addresses at a source CAS data storage space for storage therein and for replication at a destination CAS data storage space, generating a hash key for each data item at the source storage space, comparing respective hash keys with hash keys stored at a hash key storage table, to determine whether respective further data items are already present at the destination storage device; transferring respective data items to the destination storage space if no match is made to a hash key stored at the hash key storage table, but not transferring respective further data items if a match is made to a hash key stored at the hash key storage table, thereby transferring to the destination storage space only unique data items.

Low latency replication techniques with content addressable storage

A redundant array of independent disk (RAID) memory storage system comprising data storage blocks arranged in a first plurality of data rows and a second plurality of data columns, wherein parity data is stored in additionally defined parity blocks, and wherein numbers of data blocks in respective columns are different, to accommodate the additional diagonal parity data block that the geometry of the system requires. The system is suitable for an SSD array in which sequential disk readout is not required.

Method and system for storing data in raid memory devices

A device for scalable block data storage and retrieval uses content addressing. Data storage devices store data blocks, and are connected over a network to computing modules. The modules comprise control modules and data modules and carry out content addressing for both storage and retrieval. The network defines separate control paths via the control modules and data paths via the data modules.

Scalable block data storage using content addressing

In one aspect, a redundant array of independent disk (RAID) memory storage system includes a plurality of data storage disks comprising data blocks, a first redundancy storage disk comprising parity blocks that are a parity by row of the data blocks in the data storage disks, a second redundancy storage disk comprising parity blocks storing parities of diagonals of the data blocks in the data storage disks, a third redundancy storage disk comprising parity blocks storing parities of diagonals of the data blocks in the data storage disks and circuitry configured to recover data from three failed storage disks.

Data recovery after triple disk failure

A CAS data storage system replicates data on a non-CAS storage device. The CAS storage device recognizes duplicate data and stores the data only once, whereas the non-CAS device does not recognize duplication of data and requires full storage of the data. The CAS data storage device saves on redundant data transfer by transferring, in the case of duplicate data, the address of a primary location at which the data is stored and the address of the current duplication. The CAS data storage system includes a hash&#x2192;address table for this purpose. The non-CAS storage device then copies its own data from the primary location into the current location.

Growing community of inventors

Raanana, Israel

Yaron Segev