Emc Corporation

Emc IP Holding Company LLC

J Michael Dunbar

Avinash Kallat

Michael Healey

Michael Craig Fishman

A method is used in managing data in storage systems. A request is received to write data. A determination is made as to whether the data associated with the request can be relocated to a storage tier of a set of storage tiers based on a policy. The set of storage tiers includes first and second storage tiers. The first and second storage tiers are configured such that performance characteristics associated with the first storage tier is different from the second storage tier. Relocation of the data is managed to the storage tier of the set of storage tiers.

Managing data in storage systems

Techniques for performing de-duplication for data blocks in a computer storage environment. At least one chunking/hashing unit receives input data from a source and processes it to output data blocks and content addresses for them. In one aspect, the chunking/hashing unit outputs all blocks without checking to see whether any is a duplicate of a block previously stored on the storage environment. In another aspect, each data block is processed by one of a plurality of distributed object addressable storage (OAS) devices that each is selected to process data blocks having content addresses with a particular range. The OAS devices determine whether each received data block is a duplicate of another previously stored on the computer storage environment, and when it is not, stores the data block.

Method and apparatus for block level data de-duplication

Techniques for performing de-duplication for data blocks in a computer storage environment. At least one chunking/hashing unit receives input data from a source and processes it to output data blocks and content addresses for them. In one aspect, the chunking/hashing unit outputs all blocks without checking to see whether any is a duplicate of a block previously stored on the storage environment. In another aspect, each data block is processed by one of a plurality of distributed object addressable storage (OAS) devices that each is selected to process data blocks having content addresses with a particular range. The OAS devices determine whether each received to data block is a duplicate of another previously stored on the computer storage environment, and when it is not, stores the data block.

An Internet Small Computer Systems Interface (iSCSI) distance acceleration device accelerates data transfers between an iSCSI initiator and an iSCSI target over a network, such as the Internet or a wide area network (WAN). The acceleration device resides in a communication path between the iSCSI initiator and the iSCSI target. The acceleration device receives an iSCSI protocol data unit (PDU) targeted to the iSCSI target by the iSCSI initiator. The acceleration device forwards the iSCSI PDU over the network to the iSCSI target and transmits a response to the iSCSI PDU that anticipates a response to be generated by the iSCSI target upon receiving the iSCSI PDU.

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Brimfield, MA, United States of America

J Michael Dunbar