Emc Corporation

Michael Sgrosso

William F Baxter

Jeffrey Kinne

John O'Shea

Nhut Tran

Christopher S MacLellan

James Marriott Guyer

Steven T McClure

Yechiel Yochai

Almir D Davis

Avinash Kallat

Stephen D MacArthur

Alexander Y Aronov

A data storage system having protocol controller for converting packets between PCIE format used by a storage processor and Rapid IO format used by a packet switching network. The controller includes a PCIE end point for transferring atomic operation (DSA) requests, a data pipe section having a plurality of data pipes for passing user data; and a message engine section for passing messages among the plurality of storage processors. An acceleration path controller bypasses a DSA buffer in the absence of congestion on the network. Packets fed to the PCIE end point include an address portion having code indicating an atomic operation. An encoder converts the code from a PCIE format into the same atomic operation in SRIO format. Each one of a plurality of CPUs is adapted to perform a second DSA request during execution of a first DSA request.

Method for performing a raid operation in a data storage system

A data transfer system includes a PCI Express transaction layer having an input for serially receiving posted and non-posted request packets and completion packets; an application layer coupled to the PCI Express transaction layer for receiving posted and non-posted request packets and completion packets from the PCI Express transaction layer; a first transmission interface coupling the application layer to the PCI Express transaction layer; and a second transmission interface coupling the application layer to the PCI Express transaction layer. The PCI Express transaction layer transmits posted and non-posted request packets to the application layer over the first transmission interface and transmits completion packets to the application layer over the second transmission interface.

Method and system for processing packet transfers

A method is provided for transmitting user data from a selected one of a plurality of data pipes. The method includes having a ring manager select one of the data pipes from a pool of the data pipes for transmission of the user data. The data is transmitted from the selected one of the data pipes at least one packet switching network. The data pipe detects whether there was an error in the transmission. If there an error detected, the data pipe generates an error interrupt for the ring manager. The ring manager detects the error interrupt and generates an error interrupt for a CPU. The ring manager removes the selected one of the data pipes from the pool of data pipes for a predetermined period of time while the ring manager continues to work on other tasks until the time has expired. During pipe retirement, the physical pipe removed from the pool of pipes is disabled and the router will then direct orphan packets to the error ring. When the time has expired, the ring manager returns the selected data pipe to the pool of available data pipes.

Data storage system

Method of operating a data storage system having plural data pipes

Data storage system having plural data pipes

A data storage system having protocol controller for converting packets between PCIE format used by a storage processor and Rapid IO format used by a packet switching network. The controller includes a PCIE end point for transferring atomic operation (DSA) requests, a data pipe section having a plurality of data pipes for passing user data; and a message engine section for passing messages among the plurality of storage processors. An acceleration path controller passes a DSA buffer in the absence of congestion on the network. Packets fed to the PCIE end point include an address portion having code indicating an atomic operation. An encoder converts the code from a PCIE format into the same atomic operation in SRIO format. Each one of a plurality of CPUs is adapted to perform a second DSA request during execution of a first DSA request.

Data storage system having acceleration path for congested packet switching network

Data storage system having operation code in address portion for atomic operations

Data storage system having CPUs adapted to perform a second atomic operation request prior to completion of a first atomic operation request

An end point controller includes two of ingress/egress port pairs. A first one of the ingress/egress ports is adapted to send and receive one of a pair of types of information packets and a second one of the ingress/egress ports is adapted to send and receive the other one of the pair of types of information packets. A controller is coupled to the two port pairs for coupling one of ingress/egress ports to an input/output port selectively in accordance with the type of the information packet on the ingress/egress ports and the availability of the end point controller to a network. One of the egress ports is directly coupled to the output port to the network if the information packet is at such port and the end point controller has been granted access to the network while other information at the pair of egress ports is buffered prior to being coupled to the output. In like fashion, the input port from the network is directly coupled to one of the ingress ports if the information packet is of the type of information packet destined for such ingress port, said port being available to transmit the packet.

Packet switching network end point controller

Data storage system having separate atomic operation/non-atomic operation paths

Protocol controller for a data storage system

Growing community of inventors

Franklin, MA, United States of America

Michael Sgrosso