Abstract: Systems and methods of dictionary synchronization between applications over a network are provided. The dictionary synchronization can be performed with guaranteed packet ordering. With guaranteed packet ordering, operations such as data de-duplication can be performed over the wire or network.

Abstract: Methods and apparatus are provided for transmitting data over a network through a tunnel. In one embodiment, a method comprises obtaining data for transfer over a network from a sender to a receiver. At an operating system level, at least one packet is intercepted from the data that satisfies one or more configurable criteria. A tunnel is established from the sender to the receiver, wherein the tunnel selectively performs one or more of encryption, compression, and data deduplication of the intercepted packet. The intercepted packet is transmitted through the tunnel from the sender to the receiver. A handshake protocol optionally determines the presence of agents at the sender and receiver. The handshake protocol fails if agents are not present at both the sender and receiver, and the transfer is then carried out over a standard communication channel.

Abstract: A data storage system, including a host server having storage processors, a PCIe fabric, and a GBE fabric, and two or more data storage modules having a bank of DRAM, long-term storage drives, a host interface, including a PCIe interface and a GBE interface, an application specific integrated circuit connected to the host interface, the storage drives, and the DRAM, and a battery, the battery providing power to the DRAM and SSDs in an event of failure of a main power supply. Data streams transmitted from the host server via a PCIe connection of the PCIe fabric are received at the host interface and placed directly in DRAM as a write-back cache operation. In addition, the battery provides the DRAM with non-volatile memory capabilities and the storage modules with portability. A method for arbitration of write requests between the storage processors of the data storage system is also disclosed.

Abstract: Connection-oriented communication devices are provided with round trip time estimation. An exemplary method is provided for communicating between first and second communication devices over a wide area communication network. The first communication device sends a Round Trip Time (RTT) packet comprising a timestamp to the second communication device. The second communication device receives the RTT packet, copies the timestamp into a reply RTT packet and sends the reply RTT packet to the first communication device. The first communication device receives the reply RTT packet and determines a current Round Trip Time based on a difference between the timestamp and a current time. The current Round Trip Time is optionally processed by a congestion avoidance and control algorithm. An application can control a size of a queue based on conditions of the wide area communication network.

Abstract: Embodiments are described for systems and methods that optimize large-scale data transfers over a wide area network by providing a data transmission protocol stack comprising a TCP layer that exchanges data processed by a host, and an IP layer that transports datagrams encapsulating the data to routers in the WAN, and a UDP-based transmission layer within the data transmission protocol stack that interfaces with the TCP layer and transmits data and control packets between the host and receivers of the WAN using a unicast duplex protocol. The stack has a WAN optimization components layer that interacts with the UDP-based transmission layer and provides transport protocol optimization through the UDP-based transmission layer and certain data de-duplication, compression, link aggregation, and application awareness functions.

Abstract: Methods and apparatus are provided for transmitting data over a network through a tunnel. In one embodiment, a method comprises obtaining data for transfer over a network from a sender to a receiver. At an operating system level, at least one packet is intercepted from the data that satisfies one or more configurable criteria. A tunnel is established from the sender to the receiver, wherein the tunnel selectively performs one or more of encryption, compression, and data deduplication of the intercepted packet. The intercepted packet is transmitted through the tunnel from the sender to the receiver. A handshake protocol optionally determines the presence of agents at the sender and receiver. The handshake protocol fails if agents are not present at both the sender and receiver, and the transfer is then carried out over a standard communication channel.

Abstract: Connection-oriented communication devices are provided with round trip time estimation. An exemplary method is provided for communicating between first and second communication devices over a wide area communication network. The first communication device sends a Round Trip Time (RTT) packet to the second communication device, wherein the RTT packet comprises a timestamp, wherein the second communication device receives the RTT packet, copies the timestamp into a reply RTT packet and sends the reply RTT packet to the first communication device; receives the reply RTT packet from the second communication device; and determines a current Round Trip Time based on a difference between the timestamp and a current time. A current Round Trip Time is optionally processed by a congestion avoidance and control algorithm. A bitmap is optionally maintained for the chunks of a transaction indicating whether a given chunk has been acknowledged.

Abstract: A method, system, and program product for data deduplication in a replication environment, the replication environment having a production site, a splitter, and a replication site, wherein the replication site has a journal, comprising determining a digest for each chunk of data of a set of data chunks, determining for each chunk whether the digest is in an index on the production site, determining for which offsets are to be evicted from the cache on the replication site, replacing the chunks in set of chunks that are in the index with an offset, and transmitting the set of chunks, offsets and an eviction list to the replication site.