Emc Corporation

Ramprasad Shetty

David Meiri

Alexandr Veprinsky

Alex Veprinsky

Brett D Niver

Louis Krigovski

Natan Vishlitzky

Mark J Halstead

Yuval Ofek

Anestis Panidis

Gadi G Shklarsky

Sergey Kornfeld

Ilya Garelik

Described are techniques for preserving connections. First code is executed on a server. The server communicates with a client over one or more connections and the first code uses one or more control structures describing a state of the one or more connections. An operation is performed on the server. First processing is performed in response to the operation. The first processing includes loading second code for execution on the server. The second code replaces the first code and uses the one or more control structures previously used by the first code.

Techniques for persistence of connections

A system for error correction processing includes methods, software and/or devices for generating and using correction packets that may provide for the rebuilding of a lost data packet or other information packet. A correction packet may be generated at a transmitting device that corresponds to a plurality of packets transmitted to a destination device. The correction packet may be transmitted to the destination device separately from the transmitting of the plurality of packets. The correction packet may be received at the destination device, and a determination may be made as to whether at least one of the plurality of packets transmitted to the destination device is a lost packet that has not been received at the destination device. If the lost packet of the plurality of packets is determined, the lost packet may be rebuilt using the correction packet.

Side channel for forward error correction used with long-haul IP links

Described are techniques for prioritizing messaging traffic. A first message having a second message encapsulated in a payload of the first message is received. It is determined whether the first message meets one or more prioritization criteria in accordance with one or more portions of a payload of the second message.

Techniques for prioritization of messaging traffic

Transferring data elements from a source to a destination includes providing a transmission queue at the source, where data elements in the transmission queue are transferred from the source to the destination, determining an optimal length for the transmission queue, where the optimal queue length is inversely proportional data latency time at the destination, and, if the optimal length is greater than an instantaneous length of the transmission queue, adding data elements to the transmission queue. Adding data elements may include adding a number of elements corresponding to a difference between the optimal length and the instantaneous length of the transmission queue. Determining optimal length may include dividing a constant by the data latency time at the destination. Transferring data elements may also include providing a network between the source and the destination.

Flow control mechanism

A data storage system capable of performing remote data services (e.g., data mirroring) over an IP network using native connections to the IP network is described. The data storage system employs an architecture that manages the remote data services and the native connections to the IP network in a way that isolates the remote data services application software from the TCP/IP and lower level network processing.

Remote data facility over an IP network

A method and apparatus for communicating a plurality of commands from a first device to a second device over a data communication link coupling the first and second devices, the plurality of commands including at least a first command and a second command. The first and second commands are transmitted over the data communication link from the first device to the second device in a single data transmission such that only a single propagation delay through the data communication link is incurred in transmitting both the first and second commands over the data communication link.

Method/apparatus for interfacing two remotely disposed devices coupled via transmission medium with first and second commands transmitted without first checking receiving device for readiness

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Westborough, MA, United States of America

Ramprasad Shetty